Doses Of Compost Research Articles

DOSAGE EFFECTIVENESS OF MANURE AND PLANTING DISTANCE ON THE GROWTH AND PRODUCTION OF PEANUTS (ARACHIS HYPOGAEA, L)

This study aims to identify and study the effect of plant spacing and chicken manure fertilizers on growth and yield of peanut. This research was conducted at the Experimental Farm of the Faculty of Agriculture Land Dictionary Universitas Soerjo Ngawi, East Jawa , took place from Desember 2019 to March 2020 .The method used is a plot design Separated (Split Plot Design) with nine combinations of treatments and three replications. The main plot (main plot) is a spacing (A), J1 20 cm x 20 cm, 30 cm x 20 J2 cm, J3 40 cm x 20 cm, as a subplot (sub-plots) is the dose of compost (P), P1 5 tons / ha, P2 10 tons / ha, P3 15 tons / ha. Parameters observed that plant height (cm), number of primary branches (branch), the overall weight of pod (g), number of pods containing (pod), the number of empty pods (legumes), berangkasan wet weight (g), dry berangkasan weight (g ), 100 seed weight (g).Based on the results of analysis of variance showed that the spacing of chicken manure fertilizer rate and not significant for all variables observed. Treatment interaction effect was not significant on all observed variables, but the variables significantly.

Organic compost as a conditioner of soils cultivated with yellow passion fruit

This research aimed to evaluate the effect of doses of organic compost on the yield and economic profitability of organic yellow passion fruit grown in sandy-loam and clay-loam soils. Two experiments were installed in the field, in different soil types and municipalities in the state of Acre. The experimental design was in randomized blocks with five treatments, four replications, and four plants per experimental unit. The treatments consisted of adding the compost as a replacement for 1/3 of the volume of cylindrical planting holes with 40 cm, 80 cm, 120 cm, 160 cm, and 200 cm, corresponding to the addition of 6.3; 25.1; 56.5; 100.4, and 156.9 liters per planting hole, respectively. The mean fruit mass and the yield of the yellow passion fruit were higher in sandy-loam soil. The total revenue was R$ 4,311.6 ha-1 in the clayey soil and R$ 5,841.9 ha-1 in the sandy soil. The total cost was higher in the clayey soil than in sandy soil. Both soils responded in quadratic function with an increase in the cost as the volume of organic compost was increased, ranging from R$ 12,736.00 ha-1 with 6.3 liters of compost per hole up to R$ 26,249.63 ha-1 with 156.9 liters of compost per hole. Net income was negative for all compost volumes in both types of soil, responding linearly, with a reduction in revenue of R$ 80.82 ha-1 with the addition of each liter of compost in the pit due to the low yield caused by period long drought.

Phosphorus Sources Combined with Doses of Organic Compost Increased the Population of Soil Microorganisms and P Level in the Soil and Plant and the Dry Matter of Sugarcane

The aim of the study was to evaluate the effect of P sources and filter cake, enriched or not with biofertilizers and liquid peat, on the microbial population and the soil available P levels and shoot dry matter and P accumulation by sugarcane. The experiment was conducted in a greenhouse in a completely randomized design with factorial arrangement 4 × 3 + 1 and three replications. The treatments consisted in four sources of P: simple superphosphate, triple superphosphate, monoammonium phosphate and reactive natural phosphate combined with three levels of organic compound: without filter cake, decomposed filter cake (30 t ha−1, dry basis) and decomposed filter cake enriched with liquid peat (4 mL kg−1 of filter cake) and biofertilizers (480 mL kg−1 of filter cake) and a control treatment without organic compound and without phosphorus. At 45 and 110 days after planting the total population of bacteria and fungi, phosphate-solubilizing microorganisms and total microorganisms were evaluated. After 60 and 110 days, the soil available P, plants’ P and dry matter and P accumulation were evaluated. The organic compound increased the population of soil microorganism, the soil P levels, the accumulation of P and dry matter by the plants, regardless of the source of P, although the enrichment with biofertilizer and liquid peat did not enhance this effect. In conclusion, the presence of organic compost enhances the effects of phosphate fertilization.

Short-Term Effects of Sewage Sludge Compost Amendment on Semiarid Soil

The adoption of sewage sludge as an agricultural management strategy to improve soil properties and crop production is attracting great interest. Despite many positive effects on soil inorganic and organic components reported for different soil types, little information is available on sewage sludge application on Mediterranean soils, as well as on its use at different dose rates. The objectives of the present research was to evaluate, through an integrated approach, the effects of sewage sludge compost from urban wastewater on physicochemical, hydrological, biochemical parameters, and microbiota composition in soil pots under a three-year crop rotation system. Four different doses of sewage sludge compost (C3, C6, C9, C12) from municipal wastewater and a dose of them in combination with mineral fertilizer (C6N) were used. We have used 3-6-9-12 Mg/ha of sewage sludge compost for the treatments C3, C6, C9 and C12, respectively, and 6 Mg/ha of sewage sludge compost in combination with 60 kg/ha of ammonium nitrate for the treatment C6N.The effects were compared to non-fertilized (C0) and mineral fertilized (Min) sets of controls. The electrical conductivity, soil pH, stability of soil aggregates, percent of moisture of the dry soil both at the field capacity and at the wilting point, available P, and exchangeable K were all positively affected by increasing the amounts of composted sludge. The organic carbon and total N increased up to 66% and 39%, respectively. Increased enzymatic activities and microbial biomass were also observed in soil after the application of sewage sludge compost when compared to un-amended control. A higher richness and evenness among the soil plots amended with sewage sludge compost was observed, with no significant differences among the application dose rates, when compared to the un-amended soil control and soil treated with a mineral fertilizer. A three-year amendment was able to separate soil plots amended with high doses of sewage sludge compost from the low dose amended and control samples. Among the microbial groups responsible for such marked separation, bacteria belonging to Actinobacteria, Acidobacteria, Cyanobacteria and Bacteroidetes contribute the most, with a shift from oligotrophic to copiotrophic taxa. Significant changes in bacterial composition and taxonomic structure should be considered in order to properly balance agronomic and economic advantages with environmental concerns. After all, our results have evidenced the effects of sewage sludge amendment on different soil properties, microbial activity, and composition already after a short period of application. The findings are particularly relevant in semiarid soils, where an immediate restoration of soil fertility by short-term compost application is needed.

Use of arbuscular mycorrhizal fungus Rhizoglomus irregulare and compost to improve growth and physiological responses of Phoenix dactylifera ‘Boufgouss’

Date palm (Phoenix dactylifera L.) is an important crop in arid zones and plays significant ecological and socio-economic roles. During the last decades, date palm groves were subjected to degradation due to extensive soil exploitation and low soil fertility. The use of biological techniques is essential to improve date palm development. The present work aims at assessing the effect of two different doses of compost (5% and 20%) and inoculation with the arbuscular mycorrhizal fungus (AMF) Rhizoglomus irregulare on growth and development of date palm seedlings. The treatments comprised control and application of 5 and 20% of compost with R. irregulare individually or in combination. Growth, physiological, histological, and mycorrhization traits were assessed. Obtained results showed that compost applied at a low dose (5%) alone or in combination with the AMF stimulated root length, leaf area, root dry weight, nitrogen, phosphorus and potassium contents, stomatal conductance and chlorophyll fluorescence and increased the number of sclerenchyma fibers, the number of vascular bundles, root diameter, and lignification of the endodermis of date palm seedlings compared to control. Compost at low doses combined or not with AMF can successfully be applied as biofertilizers for improving the growth and development of date palm.

Response of maize (Zea mays L.) ikenne variety to application of household urban solid wastes compost

Soils fertility declining limits agricultural production in Togo where maize (Zea mays L.) is most cereal cropping and base staple food. Currently, mineral fertilizers are beyond the reach of farmers due to high price and limited availability. This study assessed the response of household urban wastes compost to the growth and yield of maize Ikenne variety. Experiments were performed in rainy season of years 2018 and 2019 at Teaching Research and Demonstration Farm of Agronomy School in University of Lome, Togo. Agronomic trials were set at randomized in complete block design with three replications, where control plots, compost plots at different doses and mineral fertilizers plots constituted the treatments. The growth parameters, including plant height, stem girth, leaf area and number of leaves per plant, were measured at the milky maize stage. The yield parameters, including length and girth of cob, thousand grains weight, grain yield and straw yield, were collected at harvesting. Data were statistically analyzed. The results showed three distinct homogeneous groups of treatments both for growth and yield parameters. Plots treated with compost at 30 t ha-1 and 40 t ha-1 constitute the best group, which differs significantly from the second group formed by plots treated with compost at 10 t ha-1 and 20 t ha-1 and mineral fertilizer plots. Control treatments constitute the last group. Growth and yield parameters values increase with compost dose. Far from being used alone in place of mineral conventional fertilizer, integrated fertilization based on combination of mineral fertilizer and compost of household urban wastes will investigated in maize cropping in southern Togo for optimal compost dose to recommend.
 Int. J. Agril. Res. Innov. Tech. 10(1): 97-101, June 2020

PENGARUH PUPUK KOMPOS DAN FREKUENSI PEMBERIAN MOL BONGGOL PISANG TERHADAP PERTUMBUHAN DAN PRODUKTIVITAS STROBERI (Fragaria sp.)

The aim of the study was to know the influence of the rice straw compost doses as fertilizer and the frequence microorganism local of banana weevil on the growth and yield of the strawberry. The experimental design of this research was Completely Randomize Design (CRD) factorial with three factors of rice straw compost doses (15, 20, 25 tons/ha) and three factors of frequence microorganism local of banana weevil (1 time, 3 times, and 5 times) with 3 replications. The parameter observed were bulk density of soil, porosity of soil, organic ingredients of soil, number of leaves, number of fruit, and weight of fruit. Data obtained was processed by analysis of variance and if there is an effect of yield treatment continued with Duncan multiple range test. The result showed that there are interaction between two treatment on bulk density and soil porosity. The compost doses and frequence microorganism local of banana weevil had significan effect on soil characteristic (bulk density, porosity, and organic ingredients of soil), improvement of best soil characteristic happen on compost doses 20 tons/ha and frequency microorganism local of banana weevil 2 times. Treatment of compost doses application 25 tons/ha will improve the parameters of number of leaves and number of fruit, while the best weight of fruit happen on compost doses 20 tons/ha with frequency microorganism local of banana weevil 1 time.

Development of fishwaste compost and its effect on quality of soil and crop

The main objective of this research was production of compost from fish waste generated from the seafood processing industries at Tuticorin district, Tamilnadu and examine the effect of fishwaste compost on crop and soil quality. The fish waste was acidic in pH (6.1) with EC of 3.8 dS/m. The total NPK content of fish waste is 10.17%, 0.20%, 0.74% respectively. It has an appreciable amount of organic carbon 46.22% and secondary nutrients calcium (1.86%) and magnesium (0.15%) respectively. Fish waste was composted with saw dust under the windrow method of composting and analysed. After composting, fish waste compost (FWC) was neutral in pH (7.1) with low soluble salts (EC = 0.38 dS/m). It had a considerable amount of N (1.6%), P (0.16%) and K (0.21%). A pot study conducted on blackgram comprising of different doses of fishwaste compost (0, 1, 2, 3, 4, 5 t/ha) along with recommended dose of fertilizer (RDF). Among the different treatments, application of FWC @ 4t/ha enhanced the growth and yield of black gram and improve the soil quality. From the study, it is evident that fishwaste compost can play a significant role in enhancing the soil properties and performance of blackgram invariant of dose applied.

Effects of Arbuscular Mycorrhiza Fungi and Coffee Pulp Compost in Improving Soil Water Uptake by Chilli Around the Permanent Wilting Point Conditions

Soil water availability to the plants is a range of water content between the field capacity and the permanent wilting point (PWP) conditions. The PWP is defined as the lower limit of soil water content that the plant can extract water from the soil as indicated by the symptoms of wilting plants. This is because plant roots are unable to penetrate the soil micropores that contain the water. The study aims to analyze the effects of arbuscular mycorrhizal fungi (AMF) and compost in enhancing soil water absorption by the plant when the water content is close to the permanent wilting point. Four doses of AMF (0, 5, 10 and 15 g.plant-1) and three doses of coffee pulp-made compost (0, 5 and 10 ton.ha-1) were arranged according to a randomized complete block design with three replicates. Results showed that the application of AMF significantly enabled the plant to improve water uptake when the soil water content was about at the permanent wilting point conditions. The AMF addition of 15 g.plant-1 significantly prolonged the growing period of chili to wither and the plant showed the wilting symptoms at the soil water content of 5 to 7% lower than the no-AMF plants. Improved water uptake under water stress conditions was attributed to increases in the root colonization by AMF.

Tütün Atığı ve Kompostunun Typic Xerofluvent Bir Toprağın Sağlığı ile Kırmızı Biber (Capsicum annuum L.) Verimi Üzerine Etkileri

Tütün atıklarının tarımda kullanılabilme potansiyelini ortaya koyabilmek amacıyla gerçekleştirilen çalışma, tesadüf blokları deseninde ve 4 tekerrürlü olarak tesis edilmiş olup, 2008 yılında Typic Xerofluvent toprakta yürütülmüştür. Ham tütün atığı (T) ve tütün atığı kompostu (TK) 20 ve 40 t ha-1 düzeylerinde, kimyasal azotlu gübre ise 150 ve 300 kg N ha-1 dozlarında faktöriyel olarak uygulanmıştır. Çalışmada mikrobiyal biyokütle C’u, N’u ve P’u (Cmik, Nmik, Pmik), enzimler (alkalin fosfataz, ALKPA; β-glukozidaz, GLU; aril sülfataz, ArSA; proteaz, PRO; üreaz, ÜA; dehidrogenaz, DHG), mikrobiyal popülasyon (amonyum oksitleyici, AOB ve nitrit oksitleyici bakteriler, NOB; genel bakteri, GB; azotobakter, AZB; genel fungus, GF) ile bazı kimyasal özellikler (toprak reaksiyonu, pH; tuzluluk, EC; organik madde, Corg; toplam azot, Nt) belirlenmiştir. Organik materyaller Cmik, Nmik ve Pmik miktarlarını arttırmıştır. Enzim aktiviteleri üzerine azotun tek başına etkisi önemli olmazken, T tüm enzim aktiviteleri üzerine; TK ise ÜA dışındaki tüm enzimler üzerine etkili olmuştur. AZB dışındaki diğer mikroorganizma gruplarını en fazla uyaran T olurken, TK ile AZB’ler daha fazla uyarılmıştır. AOB, T ile % 585, TK ile ise % 354 artış göstermiştir. Corg ve Nt miktarları özellikle T ile artmıştır. En yüksek birim verim N2T2 ve N0T2 uygulamalarında sırasıyla 192.6 ve 192.3 t ha-1 olarak ortaya çıkarmıştır. Akdeniz ikliminin etki altında sulanabilir ürünlerde ham tütün atığı 40 t ha-1 uygulanabileceği gibi, tuzluluğa daha hassas olan bitki yetiştiriciliğinde ise 40 t ha-1 dozunda tütün atığı kompostunun daha iyi bir tercih olacağı görülmektedir.

Assessment of Yield of Tomato (Lycopersicon esculentum Mill.) and Soil CO2 Emissions as Influenced by Compost Doses and Irrigation Regimes

Assessment of Yield of Tomato (Lycopersicon esculentum Mill.) and Soil CO2 Emissions as Influenced by Compost Doses and Irrigation Regimes

Application of Tithonia Compost as Alternative Synthetic Fertilizer Source N and K on Young Oil Palm Plantation

Currently, large oil palm plantations are cultivated on ultisol. Ultisol has various constraints in its utilization for the cultivation of plants, because it has high exchangeable Al, low pH, low soil organic nutrient contained, and soil nutrients such as N, P, K, Ca, Mg. Large quantities and continuous fertilizer are needed for a long time. To solve these problems required to look for alternative fertilizers. These alternative fertilizers are expected to reduce the use of synthetic fertilizers without decreasing production and are available forever. Efforts to produce that location organic matter are the right choice. Tithonia can be grown in the form of alley cropping at young palm plantations. A series of experiments have been conducted at Andalas University experimental farm in Padang, West Sumatra Province. This study used the Factorial design. The treatments are tithonia compost and Lime application. There are 3 rd compost doses in 3 replication each treatment. The experimental obtained that tithonia compost dosage 25% and 50% + 25% and 50% synthetic fertilizer were changed soil chemical properties such as increased 0.94 units soil pH, availability of nutrient contained; 6.22% C-organic, 0.25% N-total, 0.37me/100g exchangeable K, 2.74 me/100g exchangeable-Ca, 0.29 me/100g exchangeable-Mg, in the soil, as well as the decrease of exchangeable Al. Furthermore supporting plant growth such as (plant height, plant length, and the number of the leaf). Liming not significantly different for soil chemical properties and growth of oil palm. The higher the compost dose is given the better the growth of oil palms. Cultivation of tithonia as alley cropping at oil palm plantation can be used as composite materials for synthetic fertilizer substitute source N and K

Effect of Manure Compost on Distribution of Cu and Zn in Rhizosphere Soil and Heavy Metal Accumulation by Brassica juncea

Manure compost has emerged as a method of soil amendment for phytoremediation of polluted soil by heavy metals. Pot experiments were carried out to study the effects of different dosages of manure compost (0, 20, 40, 60, 80 and 100 g/kg compost to soil) on the distribution of Cu and Zn in the rhizosphere soil and the accumulation of them by Brassica juncea during the phytoremediation process. The rhizosphere soil and plant tissues were sampled at 42 days after planting to determine the concentration of heavy metals in the samples by using flame atomic absorption spectroscopy. pH value, electrical conductivity, and nutrients (alkaline-N, olsen-P, and olsen-K) increased with the addition of compost. The percentages of exchangeable Cu and residual Cu decreased, while the proportion of other fractions increased with increasing amount of manure compost. The fractions of exchangeable Zn, Fe-Mn oxide-bound Zn, and residual Zn have the same variation tendency as Cu. The variation tendencies of exchangeable Zn, Fe-Mn oxide-bound Zn, and residual Zn are the same as that of Cu. Concentrations of Cu and Zn in the overground and underground parts of B. juncea had a significant increase up to a maximum at 60 g/kg compost and then decreased. Bioaccumulation coefficients reached maximum values of 1.44 and 1.35 in the overground and underground parts of B. juncea at 60 g/kg compost, respectively. The biomass of B. juncea and total metal accumulation in B. juncea increased to the maximum at 60 g/kg compost. Obtained results indicated that appropriate amount of soil amendment is very important aspects for phytoremediation of heavy metal-contaminated soil.

MINERALIZATION OF NITROGEN AND CARBON FROM ORGANIC COMPOST FROM ANIMAL PRODUCTION WASTE

ABSTRACT Elucidating the mineralization of organic composts makes it possible to understand the release of nutrients to plants. The objective of this study was to evaluate the mineralization of nitrogen (N) and carbon (C) from organic compost from residues of the production and slaughter of small ruminants, applied on a Neossolo Flúvico (Fluvents). The compost consists of remains of grass (forage), manure and slaughter residues such as blood, viscera and the carcass of goats and sheep. Under laboratory conditions, two experiments were conducted in a completely randomized design, considering the doses of organic compost at the following levels: zero; 3.75, 7.5, 15 and 30 Mg ha-1. For the N and C mineralization tests, 11 and 32 collection times (sampling periods) were evaluated, respectively. Inorganic N content (ammonium and nitrate) was measured in the N mineralization test, and CO2-C concentration was quantified in the C mineralization test. The largest increments between the applied doses of organic compost from residues of the production and slaughter of small ruminants were 70% and 69% for potentially mineralizable N and C, with amounts of 7.5 and 30 Mg ha-1 at doses of 3.75 and 7.5 Mg ha-1, respectively. Organic C and N from residues of the production and slaughter of small ruminants are rapidly mineralized in the soil (up to 45 days) due to their low C/N ratio.

Improvement of Soil Quality Parameters by Municipal Solid Waste Compost Application in Clay-Loam Soil

Organic matter (OM) content of the soils should be improved for sustainable productions. Municipal solid waste compost (MSWC) is an organic material used in several countries to improve soil OM contents. This study was conducted to determine potential use of MSWC as soil amendment. Field experiments were conducted for two years with single MSWC treatments. Experiments were conducted on 18 plots in randomized complete blocks design with 3 replications. Six different MSWC doses (0, 40, 80, 120, 160 and 200 t ha-1) were applied to experimental plots. Compost doses were calculated in dry weight basis, applied to 21 m2 plots and sunflower was sown as the experimental plant of the study. Following the sunflower harvest, disturbed and undisturbed soil samples were taken from the experimental plots and soil samples were subjected to various analyses. Applied MSWC doses significantly increased soil OM contents, electrical conductivity (EC) and cation exchange capacity (CEC), aggregate stability (AS) and saturated hydraulic conductivity (Ksat) and reduced soil bulk density (BD). Effects of MSWC on soil pH were not found to be significant. Effects of MSWC treatments were more remarkable with increasing doses. MSWC treatments increased soil OM contents about 3 folds and increased CEC by about 25%. MSWC treatments significantly increased salt contents of the soils. Such increases were found to be significant at 1% level in the first year and 5% level in the second year. Increasing OM contents also increase soil aggregation, thus reduced bulk density and increased hydraulic conductivity. Correlation analysis revealed significant correlations between OM and AS. Present findings revealed that MSWC positively influenced physical and chemical characteristics of clay-loam soils of arid and arid climates, but salt contents should carefully be monitored in repetitive uses.

MEDIA TANAMORGANIK DAN POSISI TANAM BENIH PENGARUHNYA TERHADAP PERTUMBUHAN BIBIT KOPI ROBUSTA (COFFEA CANEPHORA )

The study aimed to determine the effect of organic planting media and the position of seed planting on the growth of Robusta coffee seedlings. The study is conducted at the Tabanan Agrotechnology Study Program, Tabanan University, which conducted from July 2019 to September 2019. The treatments are arranged in factorial in a randomized block design (RBD). Two treatments examined in this study were the doses of organic matter in the growing media (0g, 150 g, 300 g, 450 g) and seed position (prone position, upside down, tilted position). The results show that the interaction between organic planting media (soil + coffee leaf compost) and seed planting position did not significantly affect all coffee seedlings growth variables. The dose of organic compost in the growing media has a very significant effect on all growth variables except when growing and the percentage of growth. The dosing of 450 g organic matter gave the highest root fresh weight, fresh stem weight and fresh leaf weight (1.00 g, 2.97 g and 8.64 g respectively) and oven dry weight for the three variables (respectively 0.39 g, 0.55 g and 1.36 g). Seed planting position has no significant effect on all observed variables, but there is The tendency of planting position with the prone on average gives better growth compared to other positions.

Uji Perlakuan Kompos Daun Jagung (Zea mays) dan Pupuk NPK Phonska Terhadap Tinggi Tanaman dan Hasil Kacang Tanah (Arachis hypogaea L.)

Test of Corn Leaves (Zea mays) Compost and NPK Phonska Fertilizer on Plant Height and Peanut Yield (Arachis hypogaea L.). This study aims to determine the effect of giving corn leaf compost fertilizer and NPK phonska fertilizer and its interactions on the growth and yield of peanuts. The study used a Randomized Block Design with a 4x4 experiment with 2 factorial replications 3 times. The first factor is the dose of compost of corn leaf compost consisting of 4 levels, namely: o0 (control), o1 (100 g / plant), o2 (200 g / plant), o3 (300 g / plant). The second factor is the NPK fertilizer dosage consisting of 4 levels, namely: k0 (control), k1 (5 g / plant), k2 (10 g / plant), k3 (15 g / plant). The results showed that the treatment of corn leaf compost did not have a significant effect on plant height at 30.60, and 90 days after planting, pod weight and number of pods. Phonska NPK fertilizer does not have a significant effect on plant height at 30, 60, and 90 days after planting, but it has a significant effect on the number of pods and pod weight. The interaction between the compost dose of corn leaf compost and NPK phonska had no significant effect on plant height, pod weight and number of pods.

Soil chemical characteristics on coffee plantations fertilized with continuous application of compost and green manure

ABSTRACTSoil characteristics were determined in a coffee plantation after fertilization by five consecutive years with compost and green manure. Compost was applied to provide 25%, 50%, 75% and 100% of the recommended N dose for the coffee crop. Each compost dose was applied alone or combined with 3 t ha−1 of sunn hemp (SH). Linear increment of pH, sum of base (cmolc dm−3), base saturation (V%), cation exchange capacity (cmolc dm−3), effective cation exchange capacity (cmolc dm−3), concentration of P, K, Ca and Mg were detected with exclusive compost. Non-linear increments of pH, V%, concentration of P and Ca were obtained with combined fertilization. SH effect was obtained when associated with the dose 25% N. Higher ratio (Ca+Mg)/K was detected with compost 25% N + SH. The continuous and exclusive application of compost at 25% and 50% improves soil chemical characteristics, but at a dose of 100%, causes unbalance of soil characteristics like pH at slightly alkaline levels, high amount of P available and more probability of antagonism between K, Ca and Mg. The application of SH neutralizes the alkalinity of the compost, less antagonism probability between K, Ca and Mg and allows maintaining a better nutrient balance in the soil.

Effects of Chicken Compost and KCl Fertilizer on Growth, Yield, Post-Harvest Quality of Sweet Corn and Soil Health

This study aimed to determine the effects of chicken compost and KCl fertilizer application on the growth, yield, post-harvest quality of sweet corn (Zea mays L. var. saccharata), soil respiration and microbial population. The research was arranged according to a Factorial Random-Block Design consisting of two factors and three replications. The first factor was the dose of chicken compost (0 and 15 t/ha) and the second the dose of KCl fertilizer (0, 50, 100 and 150 kg/ha). The results showed that chicken compost stimulated the growth, yield, postharvest quality of sweet corn, respiration, and microbial activity of soil. KCl fertilizer increased SPAD values linearly and quadratically chlorophyll pigment, β-carotene, yield components, and yield. KCl fertilizer did not affect soil respiration, fungi, or bacteria populations. The use of chicken compost reduced the need for KCl fertilization by 25%. Therefore, the integration of organic and inorganic fertilizers are recommended to be applied by farmers in the tropics.

The effect of oyster mushroom baglog compost on the growth and production some local genotypes of purple sweet potato (Ipomoea batatas L.)

The use of compost is effective to improve the physical, biological and chemical structure of the soil, which makes plant growth and yield better. The purpose of study was to determine the effect of oyster mushroom baglog compost on the growth and production of several local purple sweet potato genotypes (accessions of Dolok Perdamean with purple tuber, accessions of Silimakuta with purple tuber, accessions of Sumbul with purple tuber, and accessions of Parbuluan with purple tuber) on the various doses of oyster mushroom baglog waste compost application (0, 10, 20, 30 ton/ha). This research was conducted at Jl. Idi Gang Eka Dewi, Medan Johor Subdistrict, from the end of December 2018 to June 2019. The results showed that the administration of oyster mushroom baglog compost gave a good influence on the growth and production of some local purple sweet potato genotypes. The accession of Sumbul with purple tuber had produces the highest growth plant stem length, while the Dolok Perdamean accession with purple tuber had produces the highest on B class tuber grading. The application of oyster mushroom baglog waste compost markedly improves on A class tuber grading. The best dose of oyster mushroom baglog waste compost was 30 tons/ha.