Organic Dosage Research Articles

Effect of Dosage and Time Interval of Application of Liquid Organic Fertilizer Gamal Leaves on Growth and Yield of Mustard Plants (Brassica Juncea L.)

The purpose of this study was to determine the effect of the dose and time interval of applying organic Gamal leaf fertilizer on the growth and yield of mustard (Brassica junceaL). The study was conducted from March 2019 to May 2019 at the STIPER East Kutai Agrotechnology Experimental Garden. The design used was a Completely Randomized Design (CRD), with a factorial pattern, where the treatment of giving a dose of organic Gamal leaf fertilizer consisted of 4 treatments, namely: D0 = 0 ml L- 1, D1 = 40 ml L-1, D2 = 80 ml L-1, D3 = 120 ml L-1, while the time interval treatment consisted of 3 treatments, namely I1 = once every 3 days, I2 = once every 5 days, I3 = 7 days once. All treatments were repeated 3 times. Data were analyzed by analysis of variance followed by the smallest significant difference test at a significance level of 5%. The variables observed included the height of the mustard plant, the number of leaves of the mustard plant, the fresh weight per plant of the mustard greens. There was no interaction between the dosage of liquid organic fertilizer of Gamal leaves and the time interval of administration of all the variables measured. significantly to plant height (8.332), number of leaves (7.911) and fresh weight (7.027), while the time interval treatment had a significant effect only on plant height (8.076) and number of leaves (7.683).

Pertumbuhan dan Hasil Kailan (Brassica oleraceae Var Alboglabra L. H. Bailey) Pada Pemberian Pupuk Organik Cair Limbah Kulit Buah di Tanah Gambut

This study aims to: 1). to determine the effect of organic fertilizer application of fruit peel waste on the growth and yield of kailan plants on peat soil; 2). to know the organic fertilizer that gives the best growth and yield of kailan plants on peat soil; 3). to determine the best dose of organic fertilizer for fruit peel waste on the growth and yield of kailan plants on peat soil.The study was conducted using a Non-factorial Completely Randomized Design (CRD), with 10 levels of treatment, each treatment being repeated 3 times so that 30 experimental units were obtained. This research was conducted in a green house with a plastic roof on Langkai Village, Pahandut District, Palangka Raya City, Central Kalimantan, from May to July 2021. The results showed that the application of liquid organic fertilizer from fruit peel waste had no significant effect on all observation parameters but liquid organic fertilizer of pineapple peel waste 20 ml plant-1 gave the best results at plant fresh weight of 90.44 g and total chlorophyll content of 0.38 mg g-1. Liquid organic fertilizer from banana peel waste at a dose of 20 ml plant-1 gave the best growth with 8.53 leaves, 11.16 g root weight and 897.87 cm2 leaf area.

PENGARUH PEMBERIAN BEBERAPA DOSIS PUPUK ORGANIK CAIR (POC) TERHADAP PERTUMBUHAN BIBIT KAKAO (Theobroma cacao L.)

This research aims to determine the effect of several doses of liquid organic fertilizer of tomatoes on the growth of cocoa nurseries. Cocoa nurseries need nutrients that support the growth of cocoa seedlings. Liquid organic fertilizer of tomatoes contains the nutrients needed for the growth of cocoa seedlings. This research method was carried out experimentally with 6 treatments of POC doses of a mixture of tomato extract, coconut water, and rice water, with 4 replications. he results of the study, it was explained that giving a dose of 25 ml of POC mixed with tomato extract, coconut water and ricE water/ 100 ml of water had a good effect on the growth and development of cocoa seedlings for the character of seedling height, number of leaves and leaf length. Furthermore, for the character of stem diameter, no significant effect was seen on the increased in stem diameter of cocoa seedlings. To overcome this, it is necessary to increased the dose of fertilizer or add other organic materials that can increases the diameter of the cacao seedlings.

Utilization of Liquid Organic Fertilizer of Pineapple Waste to Improving Growth of Sweet Corn Plant in Red Yellow Podsolic Soil

<em>This study aims to determine the effect of pineapple waste liquid organic fertilizer on the growth and yield of sweet corn in Red Yellow Podsolic soil and to obtain a dose of pineapple waste liquid organic fertilizer that can produce the highest growth and yield of sweet corn in Red Yellow Podsolic soil. This study used a completely randomized design (CRD), with 5 treatments repeated 5 times and 3 plant samples. The treatment given was in the form of a dose of liquid organic fertilizer with a dose of: P0 = 0 ml/l water, P1 = 25 ml/l water, P2 = 50 ml/l water, P3 = 75 ml/l water, P4 = 100 ml/l water. The parameters observed in this study were plant height, leaf area, root volume, soil pH, C-Organic content, N, C/N ratio and soil bulk weight. The data obtained were analyzed by fingerprint analysis of variance at the 5% level and then further tested with 5% HSD. Based on the results of the study, the dosage level of liquid organic fertilizer of pineapple waste had a significant effect on the variables of root volume and soil pH. However, it had no significant effect on the variables of plant height, leaf area, organic %C content, %N soil content, C/N ratio, and bulk density of Ultisol soil. The treatment level of liquid organic fertilizer from pineapple plant waste 50 ml/l gave the best results on the variable soil pH, and the dose of liquid organic fertilizer of pineapple plant waste 75 ml/l was the treatment that gave the best results on the variable root volume.</em>

The Effect Of Organic Fertilizer And Nitrogen On Growth And Yield Of Pakchoy (Brassica rapa L. var chinensis)

Pakchoy (Brassica rapa L. var chinensis) is a horticultural plant that has a high economical value and profitable because it is much favored by the community. The use of organic fertilizer is a step to reduce the use of inorganic fertilizer. Nitrogen plays a role in the formation of chlorophyll, proteins, fats, and other organic compounds. The purpose of the study is to study interactions on organic fertilizer and Nitrogen to the growth and yield of pakchoy crops (Brassica rapa L. var chinensis), as well as obtain appropriate dosages on organic fertilizer and Nitrogen on growth and Yield of Pakchoy crops (Brassica rapa L. var chinensis). The research has been conducted in Ampeldento Village, Karangploso Sub-district, Malang District, East Java. The research was held in 24 July – 29 August 2020. The research was used the method of Randomized Block Design Factorial with two factors and 3 replication. The data obtained were analyzed using ANOVA, if there are any real influence then continued with further test LSD 5%. The results showed that there is an interaction between organic fertilizer and nitrogen to the growth and yield, and Obtained doses of organic fertilizer and nitrogen in cow manure 20 tons ha-1 + (1 liter of cow biourine + 10 liters of water) and 130 kg N ha-1 can increase N in the soil so that it can increase the growth and yield of pakchoy plants.

Ecological and agrochemical assessment of the state of agricultural landscapes in Ivano-Frankivsk region

In the Western region of Ukraine, one of the main factors influencing the ecological safety of agricultural landscapes is anthropogenic pressure. Based on monitoring studies, ecological and agrochemical assessment of the state of agrolandscapes of IvanoFrankivsk region is conducted, in particular in residential areas. The state of soils, natural waters and crop production was studied by the method of route monitoring. Chemical and analytical studies were carried out using methods of chemical, physical and chemical analysis using modern methods of atomic absorption spectrophotometry, flame photometry, in accordance with the requirements of the quality management system, according to methods that meet the regulatory framework of Ukraine. It was determined that some of the studied soil samples had very low acidity and high content of biogenic elements (especially phosphorus and potassium) and pollutants. The quality of natural waters in some cases did not meet the regulatory requirements. This is due to both natural factors — features of the hydrological regime, and anthropogenic — violation of sanitary rules for the development of the territory, the introduction of high doses of mineral and organic fertilizers, noncompliance with manure storage technologies, the maintenance of domestic animals and poultry, and the disposal of livestock and household waste. Some samples of crop products did not meet sanitary and hygienic standards for the content of lead, cadmium, nickel, copper and iron. Studies indicate a significant impact of the anthropogenic factor on the change in the quality of soil, natural waters and crop production. Conducting an ecological and agrochemical assessment of the state of agricultural landscapes in the Western region, including residential areas and establishing the features of migration and accumulation of biogenic elements and ecotoxicants, is a promising area of research to develop measures to prevent pollution of soil, groundwater, open reservoirs and plant products.

Pengaruh Dosis Pupuk Kalium dan Pupuk Organik Cair terhadap Persentase Serangan Penyakit Bulai dan Potensi Hasil Benih Jagung Manis (Zea mays saccarata L.) Hibrida

Downey Mildew is an important disease in corn plantation, the disease attacks the plantation in young phase until 100% and causes significant loss for farmers. the purpose of this study is to get a recommendation for an appropriate dose of potassium fertilizer and organic liquid fertilizer in suppressing the percentage of downey mildew attack and increase the production of hybrid sweet corn (Zea mays saccarata L.). This study used factorial randomized completely block design in order of potassium fertilizer (K) consist of 3 stages: K0 (0 gr/plant), K2 (3 gr/plant), K3 (6 gr/plant) and the second factor is in order of organic liquid fertilizer (P) consist of 3 stages: P0 (0 ml/liter), P1 (4ml/liter), P2 (8ml/liter) each treatment is replicated 3 times. The result was showed potassium treatment (K) gave significantly differen effects for the parameter of plant height k2 with an avarage of 179.0 cm, weight of cobs without husk per plantation K2 with an avarage 298.5 g, cob lenght K2 with an avarage21.3 cm, weight 1000 grains K2 with an avarage 157.6 gr, and potential harvest per hectare K2 with an avarage 15.3 ton. Gave significant effect for parameter leaf width K2 with an avarage 9.5 cm and harvest cobs K2 with an avarage 1.8. The treatment of liquid organic fertilizer (P) also gave significantly differen effects for parameter of harvest cobs P2 with an avarage 1.9. Gave significant effect for parameter weight of cobs without husk per plantation P2 with an avarage 293.4 gr, cob lenght P2 with an avarage 21.4 cm and potential harvest per hectare P2 with an avarage 15 ton. Together, the two treatments gave significantly differen effects for the parameter of number of seeds per cob K2P2 with an avarage 385.5 seed, and gave significant effect for parameter except the percentage of downy mildew attack K2P2 with an avarage 55.2%.

Potato Farming Biologization as a Food Security Basis

The paper discusses the experimental results of growing potatoes based on scientifically grounded crop rotations and biologized technologies. The main biological agriculture problem is to maintain the ecological balance in the biosphere based on the search for natural reserves to increase crop productivity while improving soil fertility and quality of crop products and reducing costs for energy and resources required for their production. The studies have revealed that green manure affects not only the yield of potatoes but also the population of soil microorganisms, which leads to increased reproduction of bacteria and actinomycetes. The highest yield was recorded in the crop rotation with sweet clover – 16.8 t/ha; when plowing the pea-oat mix, it reached up to 15.4 t/ha, and when plowing oats - up to 16.3 t/ha, which increased yield by 0.5-2.9 %. From among the most effective environmentally sound technologies, organic fertilizers, growth stimulants, and various fungicides are also applied. When using various organic fertilizer doses in combination with mineral fertilizers, the yield of potatoes and the content of phosphorus and potassium increase. Complex treatments of plants with ‘Ridomil Gold’ and ‘Cuproxat’ fungicides during the growing season reduce the incidence of fungal and bacterial diseases in both plants (by 3.7-3.9 %) and tubers (by 2.7-3.5 %) during the storage period.

The impact of NPK fertilizer on growth and nutrient accumulation in juniper (Juniperus procera) trees grown on fire-damaged and intact soils.

Wildfires significantly alter soil properties and result in vegetation shifts; therefore, rapid reforestation activities are needed in the forests affected by wildfires. The decreased nutrient in the soil is the obvious effect of wildfires; however, little is known about the reforestation of Juniper (Juniperus procera) forests with application of NPK fertilizers. Juniper forests are common in Asir and Taif regions of Saudi Arabia and vulnerable to wildfires; thus, reforestation is needed after the onset of fires. This study assessed the impact of different doses of organic NPK fertilizer (0, 5 and 10 g/L) on growth and nutrient accumulation of Juniper trees grown on fire-damaged and intact soils. Data relating to tree height, number of leaves per plant, fresh and dry biomass accumulation in shoot and root, chlorophyll contents and uptake of N, P, K, and Na were recorded. Individual and interactive effects of soil types and fertilizer doses significantly altered all measured traits with minor exceptions. Overall, higher values of the measured traits were recorded for intact soil and 10 g/L fertilize dose. The increasing fertilizer doses improved the growth and nutrient acquisition and application of 10 g/L fertilizer on intact soil recorded the highest values of growth traits. Juniper trees grown on fire-damaged soil accumulated higher amount of nitrogen than intact soil. Similarly, the trees grown on intact soil accumulated lower amount of Na and maintained comparable K/Na ratio to intact soil. It is concluded that supplying 10 g/L fertilizer could improve the establishment of Juniper trees on fire-damaged soil. Therefore, organic fertilizer can be used to improve the reforestation of wildfire-affected Juniper forests in the Asir province.

Co-application of biochar and organic fertilizer promotes the yield and quality of red pitaya (Hylocereus polyrhizus) by improving soil properties

This study evaluated the combined impact of biochar and organic fertilizer on the soil properties, yield and quality of red pitaya (Hylocereus polyrhizus). A two-year (2019 and 2020) field experiment was conducted to study the effects of 3 rates of biochar (with carbon fertilizer ratios of 0%, 3%, and 6% w/w) combined with 3 levels of organic fertilizer (22.5, 45, and 90 t ha−1) on soil properties, along with red pitaya yield and quality. The results showed that soil pH, total organic carbon, available nutrients (N, P, and K), the yield and qualities (reduced sugar, soluble protein, and soluble solid) of red pitaya increased with the application of organic fertilizer compared with no application of biochar and organic fertilizer (CK treatment), but the combined application of biochar and organic fertilizer was more effective than their sole application. Furthermore, a medium dose of organic fertilizer combined with 3% biochar (C3F2 treatment) and a high dose of organic fertilizer combined with 3% biochar (C3F3 treatment) had the highest yields of red pitaya in 2019 and 2020. However, an application of 6% biochar with a low dose of organic fertilizer treatment (C6F1) had the highest profit in 2020, not the C3F3 treatment. The highest profits were observed in the C3F2 (71.0 × 103 RMB·t−1) and C6F1 (51.2 × 103 RMB·t−1) treatments. From the point of view of red pitaya yield and economic benefits, 3% biochar +45 t ha−1 organic fertilizer was the recommended combination that showed the best synergistic effect.

PEMANFAATAN KOMPOS AMPAS TEBU PADA TANAMAN SORGUM (Shorgum bicolor (L.) Moench) DI LAHAN KERING : OPTIMALISASI PEMANFAATAN LAHAN KERING DI PROVINSI JAMBI

Sorghum is one type of cereal plant that has great potential to be developed in Indonesia because it has a wide adaptation area. Sorghum has been known and cultivated for a long time in several regions in Indonesia. The opportunity to increase production through increasing productivity is still very large because up to now the productivity that has been achieved is only 60% of the potential yield of each new variety that has a potential yield of 6 tons / ha. One of the causes of low sorghum production is due to minimum fertilization and nutrient-poor soil. Efforts that can be made to keep crop production balanced will require innovation in the supply of environmentally friendly plant nutrients, one of which is by utilizing bagasse waste into organic fertilizer. The study was conducted at the Experimental Garden of the Faculty of Agriculture, Jambi University, Mendalo Indah Village, Jambi Luar Kota District, Muaro Jambi Regency which was located at an altitude of 35 m above sea level and Ultisol soil type. The study aimed to determine the effect of bagasse compost on the growth and yield of sorghum and to obtain a dose of bagasse compost that can provide the best growth and yield of sorghum. This study was conducted using a randomized block design (RBD) with one factor, namely the dose of organic bagasse organic fertilizer consisting of 4 levels of treatment. The treatment used in this study was (P0) administration of inorganic fertilizers, (P1) administration of 5 tons / ha bagasse organic fertilizer, (P2) giving 10 tons / ha bagasse organic fertilizer, (P3) giving bagasse organic fertilizer 15 ton / ha. The variables observed were plant height, number of leaves, age of flowering, root dry weight, plant dry weight, panicle length, seed weight per plant, weight of 1000 seeds, and yield per hectare. The results showed that bagasse compost treatment had a significant effect on plant height. However, there was no significant effect on the number of leaves, age of flowering, root dry weight, dry weight of plants, panicle length, weight of 1000 seeds and dry seed weight of planting and harvest index

Growth Response and Yield Of Lettuce (Lactuca Sativa L.) On Top Soil Alfisol Planting Media From Jamaimo Village, Mariat District, Sorong Regency To Bio Boost Fertilizer Treatment

Lettuce has great potential to be developed. However, the limited condition of agricultural land in Indonesia requires alternative for efficient cultivation systems that can maintain the yield and growth of lettuce plants. Therefore, the cultivation carried out in this study was cultivation on narrow land with polybags using planting media top soil Alfisoll from Jamimo Village, Mariat District, Sorong Regency. Considering this, a study was conducted to determine the effect of best concentration of liquid Bioboost organic fertilizer in increasing the growth and yield of lettuce on Alfisol top soil planting media. This research was conducted in Klawuyuk Village, Sorong City, and analyzed soil samples at the Chemistry and Soil Fertility Laboratory, Department of Soil Science, Faculty of Agriculture, Hasanuddin University Makassar. This study used a Completely Randomized Design (CRD) with one treatment factor, namely the concentration of Bio-Boost liquid organic fertilizer which consisted of 4 treatment levels, namely 1) without Bio-Boost liquid organic fertilizer (control)); 2) 60 ml Bio- Boost liquid organic fertilizer + 1 liter of water 3) 80 ml Bio-Boost liquid organic fertilizer + 1 liter of water; 4)100 ml Bio-Boost liquid organic fertilizer + 1 liter of water. Observational data were analyzed statistically with analysis of variance at the 5% level. The dosage of Bio-Boost liquid organic fertilizer gave a very significant effect on the growth and yield of lettuce on Alfisol top soil planting media, where the concentration of B2 treatment (80 ml of Bio-Boost liquid organic fertilizer + 1 liter of water) resulted in variables growth and the highest yield, namely plant height 39.5 cm, several leaves 11, leaf area 91.3 cm, and wet weight 610, 4 gr.

PENGARUH BENTUK DAN DOSIS PUPUK ORGANIK TERHADAP SIFAT KIMIA TANAH, KANDUNGAN HARA MAKRO DAUN DAN PERTUMBUHAN VEGETATIF BIBIT JERUK SIAM (Citrus nobilis lour)

Orange is a national superior commodity that has an important role in increasing foreign exchange for the country. However, the development of citrus cultivation in Indonesia is still relatively low, probably due to soil fertility degradation. Therefore, this study aimed to analyze the effect of differences in the application of organic fertilizer (form and dose) and their interaction on soil chemical properties, nutrient concentration in the leaf (i.e. N, P, K), and growth in Siamese citrus seedlings. The treatments included the application of a combination of forms and doses of organic fertilizer, namely SD1 (powder dose 2 t ha-1), SD2 (powder dose 4 t ha-1), SD3 (powder dose 6 t ha-1), SD4 (powder dose 8 t ha-1), SD5 (powder dose 10 t/ha), GD1 (granule dose 2 t ha-1), GD2 (granule dose 4 t ha-1), GD3 (granule dose 6 t/ha), GD4 (granule dose 8 t ha-1) and GD5 (granule dose 10 t ha-1). The results showed that there was a significant difference in the interaction between form and dose of organic fertilizer only in the number of primary branches at 4 WAP (weeks after application) with the highest values was found in powder organic fertilizer at a dose of 8 t ha-1 and granules organic fertilizer at a dose 10 t ha-1. In addition, the application of powder organic fertilizer application had a higher plant height at 10-12 WAP as compared to the application of granule organic fertilizer.

PENGARUH DOSIS PUPUK ORGANIK LIMBAH KULIT KOPI DAN KONSENTRASI CUKA KAYU (Wood Vinergar) KINA (Chinchona spp) TERHADAP PERTUMBUHAN BENIH KOPI DI PERSEMAIAN

This study aims to determine: The effect of the interaction of organic fertilizer dose of coffee husk waste and quinine wood vinegar concentration on the growth of coffee seeds in nurseries. The research was carried out on the land of the Faculty of Agribusiness and Agricultural Engineering, Subang University, West Java Province with an altitude of 118 meters above sea level with an average temperature of 28 – 30 C, the experiment was carried out from May to July 2019, the type of rainfall was very wet. The method used in this study is an experimental method with a Randomized Block Design with a factorial pattern consisting of 2 treatment factors. The first factor is the dose of coffee husk waste (P) consisting of 4 treatment levels, namely p0 = 0 t ha-1 organic fertilizer for coffee husk waste; p1 = 5 t ha-1 organic fertilizer from coffee husk waste; p2 = 10 t ha-1 organic fertilizer from coffee husk waste; p3 = 15 t ha-1 organic fertilizer from coffee husk waste. The second factor is the concentration of quinine vinegar (C) which consists of 4 levels of treatment, namely c0 = 0% quinine vinegar; c1 = 1% quinine vinegar; c2 = 2% quinine vinegar; and c3 = 3% quinine vinegar. The results showed that for the treatment of organic fertilizer coffee husk waste at 6 WAP and 8 WAP there was an increase in growth at a dose of 5 t ha. Wood vinegar concentration of 3% gave significant growth at 6 WAP observations and the best results. There was no interaction between the use of organic fertilizer dose of coffee husk waste and quinine wood vinegar concentration on the growth of coffee seeds in the nursery.

Evaluation of organic fertilizer in transplanted Basmati Rice

A research study was conducted at the school of organic farming, Punjab Agricultural University, Ludhiana during kharif season of 2019 and 2020. It comprised of seven treatments, replicated thrice in a randomized block design with these treatments T1- Nursery @ 25ml OF/hectacre + puddling @75ml OF/hectare+ 10DAT@ 75ml OF/hectare + 20 DAT@ 50ml OF/hectare, T2 - Recommended dose of fertilizers, T3 -T1 + 100 per cent RDF, T4 - T1+ 50 per cent RDF, T5 - T1+FYM@ 6t ha-1, T6 - Control (No fertilizers), T7 - 50 per cent RDF + double dose of organic fertilizer (puddling @150ml of/hectare+ 10 DAT@ 150ml of/hectare + 20DAT@ 100ml OF/hectare. The experimental results have revealed that the treatments T2 and T3 are statistically are par with each other, approximately 4.13 per cent increase in yield was observed in organic fertilizer treatment during first year. On two years’ average basis, it was found that treatment T3 gave 3.22 per cent higher yield compared to recommended dose of fertilizer with increase in organic carbon and no significant effect on soil properties. There was significant increase in grain yield in T5 treatment when compared to T1 treatment.

Factors affecting farmers’ decision to use organic fertilizers on Robusta coffee plantation: A case study in Tanggamus, Lampung

The dependency on agri-chemical inputs, such as fertilizers and pesticides, tends to increase among small-scale farmers in developing countries. On the other hand, demand for organic products, including coffee, continuously increases due to the rising concern of the consumers for sustainable products and a healthy lifestyle without chemical residues. This study aims to understand the determinant factors that affect small-scale farmers in using organic fertilizers. The research was conducted in Tanggamus Regency from June – August 2019 using a survey method. Respondents were determined using a simple random sampling method. Data were analyzed using descriptive statistics and a linear regression model. The results showed that the use of organic fertilizers is still limited and farmers tend to use chemical fertilizers to maintain their coffee plants. The dose of inorganic fertilizer and ownership of the number of coffee trees have a negative effect on the application of organic fertilizer. While the experience of farmers in coffee farming and the age of coffee plants have a positive effect on the dose of organic fertilizer applied.

ДИНАМИКА СОДЕРЖАНИЯ МИКРОЭЛЕМЕНТОВ В ПОЧВЕ ПРИ ОСВОЕНИИ МАЛОПРОДУКТИВНЫХ ЗАЛЕЖНЫХ ЗЕМЕЛЬ ВЕРХНЕВОЛЖЬЯ

The studies were carried out at LLC Ruch’evskoe-1, Rzhevsky district, Tver region in 2012…2018 during development of low-yielding, previously reclaimed lands that were retired from circulation. The total area of arable land is 5297 hectares, the soils are sod-podzolic, light loamy in terms of particle size distribution. The effect of the systematic application of high doses of organic fertilizers from pig-breeding complexes in the form of solid fraction of manure (60…80 t/ha) and liquid waste (100…120 m3/ha) on the dynamics of the content of copper, zinc, boron and manganese in the arable layer has been studied. It was found that during the six-year observation period on soils with a leaching type of water regime, the average weighted copper content had only positive tendency to increase as the increment to the initial value was 0.1 mg per a kilogram of soil (0.1 mg/kg), which was within the experimental error and amounted to 1.7 mg/kg at the optimal value for the region 2.45 mg/kg. A similar situation is typical in the study of the dynamics of zinc, the average weighted content of which reached 0.9 mg/kg, which is significantly lower than the optimal level of 3.55 mg/kg. Consequently, with the deacidification of fallow lands from the introduction of alkaline organic fertilizers, a significant increase in the available forms of copper and zinc was not noted, which requires additional introduction of microelements to eliminate their deficiency. At the same time, the systematic application of high doses of organic fertilizers significantly improved the provision of low-yielding lands with boron and manganese, the content of which in the arable layer approached the optimal value and at the end of observations amounted to 0.50 and 44.8 mg/kg, respectively, with an optimal level of 0.52 and 50.5 mg/kg.

Do biofertilizers affect nodulation ability and pod production in peanut genotypes?

Peanuts are an important legume for the Northeastern Brazilian market, but their production in this region is low. The present study aimed to evaluate the effect of biofertilizer doses on peanut nodulation and production components, to define the best dose and genotype. The experiment was conducted in a completely randomized block design (DBC) in a 3 x 3 factorial arrangement, with three replications. The treatments consisted of two evaluation factors: 1) Fertilization via different doses of organic fertilizer applied to the substrate (D1 = 0mL; D2 = 500mL; and D3 = 1000mL); and 2) Peanut genotypes (BR-1, UNI43 and UNI08). The following traits were assessed: number of nodules per plant (NNP), number of mature pods (NVM), pod mass per plant (MVP), seed mass per plant (MSP) and root length (CR). Peanut production is affected by fertilization via bovine biofertilizer, mainly for the components NVM, MVP and MSP. Besides, nodulation is a likely conditioner. The 1000mL dose proved to be the best treatment for the traits analyzed, and UNI08 accession, the most responsive material.

PENGARUH PUPUK ORGANIK CAIR DARI BONGGOL PISANG TERHADAP KADAR HARA NITROGEN TOTAL DAN C-ORGANIK PADA BIBIT KELAPA SAWIT (Elaeis guineensis Jacq.)

Suspension media is made of natural ingredients to multiply microorganisms that can accelerate the destruction of organic matter. Banana hump contains water, iron, phosphorus, calcium, carbohydrates, calories and protein, which are potential as organic fertilizers. Application of banana weevil fertilizer is expected to increase the carrying capacity of the soil for the availability of organic matter and nutrients. The purpose of this study was to determine the best concentration or dose of organic liquid fertilizer for banana weevil on the vegetative growth of oil palm (Elaeis guineensis Jacq.) seedlings in the Main Nursery. Based on this statement, this research was compiled with the object of oil palm in the Main Nursery. This research was conducted in the Nursery Practice Garden area at STIP-AP Medan. Soil analysis was carried out at the Soil Laboratory of the Agricultural Technology Research Institute (BPTP) of North Sumatra. The time of the study was carried out for 8 months, from January 2021 - August 2021. This study used a Randomized Block Design (RAK) with 2 factors, namely Factor (1) Liquid Organic Fertilizer Banana Cobs and Factor (2) Compound Fertilizer (NPK) 16:16 :16. The treatment was repeated 3 times, with the number of samples being 2 plants so that the sample population was 54 plants. Parameters observed were seedling height, stem circumference, number of leaves, leaf width, root wet weight, shoot wet weight, shoot dry weight, root dry weight, total nitrogen nutrient content and C-organic nutrient content. The data obtained were analyzed statistically by analysis of variance (ANOVA) with 5% and 1% significant difference tests. The results showed that the treatment of banana weevil liquid organic fertilizer and compound fertilizer had no significant effect on the observed parameters. However, the biomass formed was significantly affected as indicated by the weight parameter. The availability of total nitrogen and C-organic nutrients in Ultisol soil showed a very low classification with total nitrogen values of 0.07 – 0.09% and C-organic values of 0.22 – 0.54%.

PENGARUH PUPUK ORGANIK CAIR DARI BONGGOL PISANG TERHADAP KADAR HARA NITROGEN TOTAL DAN C-ORGANIK PADA BIBIT KELAPA SAWIT (Elaeis guineensis Jacq.)

Suspension media is made of natural ingredients to multiply microorganisms that can accelerate the destruction of organic matter. Banana hump contains water, iron, phosphorus, calcium, carbohydrates, calories and protein, which are potential as organic fertilizers. Application of banana weevil fertilizer is expected to increase the carrying capacity of the soil for the availability of organic matter and nutrients. The purpose of this study was to determine the best concentration or dose of organic liquid fertilizer for banana weevil on the vegetative growth of oil palm (Elaeis guineensis Jacq.) seedlings in the Main Nursery. Based on this statement, this research was compiled with the object of oil palm in the Main Nursery. This research was conducted in the Nursery Practice Garden area at STIP-AP Medan. Soil analysis was carried out at the Soil Laboratory of the Agricultural Technology Research Institute (BPTP) of North Sumatra. The time of the study was carried out for 8 months, from January 2021 - August 2021. This study used a Randomized Block Design (RAK) with 2 factors, namely Factor (1) Liquid Organic Fertilizer Banana Cobs and Factor (2) Compound Fertilizer (NPK) 16:16 :16. The treatment was repeated 3 times, with the number of samples being 2 plants so that the sample population was 54 plants. Parameters observed were seedling height, stem circumference, number of leaves, leaf width, root wet weight, shoot wet weight, shoot dry weight, root dry weight, total nitrogen nutrient content and C-organic nutrient content. The data obtained were analyzed statistically by analysis of variance (ANOVA) with 5% and 1% significant difference tests. The results showed that the treatment of banana weevil liquid organic fertilizer and compound fertilizer had no significant effect on the observed parameters. However, the biomass formed was significantly affected as indicated by the weight parameter. The availability of total nitrogen and C-organic nutrients in Ultisol soil showed a very low classification with total nitrogen values ​​of 0.07 – 0.09% and C-organic values ​​of 0.22 – 0.54%.