Effect Of Slow-release Fertilizer Research Articles

Effects of Slow-Release Fertilizer on Lotus Rhizome Yield and Starch Quality under Different Fertilization Periods

Slow-release fertilizer is an environmentally friendly fertilizer that is widely used in crop cultivation instead of traditional nitrogen fertilizer. However, the optimal application time of slow-release fertilizer and its effect on starch accumulation and rhizome quality of lotus remains unclear. In this study, two slow-release fertilizer applications (sulfur-coated compound fertilizer, SCU, and resin-coated urea, RCU) were fertilized under three fertilization periods (the erect leaf stage, SCU1 and RCU1; the erect leaf completely covering the water stage, SCU2 and RCU2; and the swelling stage of lotus rhizomes, SCU3 and RCU3) to study the effects of different application periods. Compared with CK (0 kg∙ha-1 nitrogen fertilizer), leaf relative chlorophyll content (SPAD) and net photosynthetic rate (Pn) remained at higher levels under SCU1 and RCU1. Further studies showed that SCU1 and RCU1 increased yield, amylose content, amylopectin and total starch, and the number of starch particles in lotus, and also significantly reduced peak viscosity, final viscosity and setback viscosity of lotus rhizome starch. To account for these changes, we measured the activity of key enzymes in starch synthesis and the relative expression levels of related genes. Through analysis, we found that these parameters increased significantly under SCU and RCU treatment, especially under SCU1 and RCU1 treatment. The results of this study showed that the one-time application at the erect leaf stage (SCU1 and RCU1) could improve the physicochemical properties of starch by regulating the key enzymes and related genes of starch synthesis, thus improving the nutritional quality of lotus rhizome. These results provide a technical choice for the one-time application of slow-release fertilizer in lotus rhizome production and cultivation.

Effects of coated slow-release fertilizers on nitrous oxide emission from winter wheat field in a cool-temperate region in Japan

ABSTRACT To elucidate the effects of slow-release fertilizers on nitrous oxide (N2O) emission from fields with winter wheat cultivation in cool-temperate regions, we conducted a two-year field experiment in Hokkaido. Four types of fertilizer treatment, i.e., urea (U), coated urea (CU), coated calcium nitrate (CC), and no nitrogen fertilizer (NN) were investigated. In the U treatment, urea was applied at 40 and 90 + 60 kg N ha−1 in autumn and in spring, respectively. In the CU and CC treatments, all the nitrogen (190 kg N ha−1) was applied using coated fertilizers in autumn for the first cultivation, whereas nitrogen was applied at 130 kg N ha−1 using the coated fertilizers in autumn and the remaining 60 kg N ha−1 was applied using urea in spring for the second cultivation. The magnitudes and seasonal courses of N2O flux did not largely differ among the treatments (i.e., types of fertilizer), including the NN treatment in most of the experimental periods except that the N2O fluxes were higher in the U and CU treatments than in the CC and NN treatments at the beginning of the second wheat cultivation. In all the treatments, the N2O flux showed the highest peak immediately after basal fertilization, followed by other small peaks in autumn. After the next spring, the N2O flux consistently remained low until the wheat harvest including immediately after the end of snowmelt and after supplemental fertilizations. Cumulative N2O emissions tended to be lower in the CC treatment than in the U and CU treatments, although these differences in the emissions were not statistically significant. Although the wheat grain yields were lower in the CU and CC treatments than in the U treatments, the differences were small for the second wheat cultivation. These results indicate that reduction in N2O emission with no decrease in the wheat yield can be achieved by the basal application of slow-release nitrate fertilizer combined with the supplemental application of conventional fertilizer in winter wheat cultivation in Hokkaido, although further studies are still necessary to determine the optimum allocation levels of the basal and supplemental nitrogen applications.

Effect of slow-release fertilizer on soil fertility and growth and quality of wintering Chinese chives (Allium tuberm Rottler ex Spreng.) in greenhouses

To avoid the negative impact of excessive fertilization on vegetable production, a decreased fertilization experiment was conducted in a multi-layer covered plastic greenhouse in 2017 to 2018. Treatments included no fertilizer (CK), traditional fertilization (TF), slow-release fertilizers (SRF), and decreased fertilization with slow-release fertilizers (DSRF). Results showed that the SRF and DSRF increased leaf length (13% and 8.3%) and chlorophyll content (7.1% and 8.2%) of Chinese chives compared to TF. Similarly, DSRF was found to increase the accumulation of dry matter accumulation of roots (22%) and the dry matter accumulation of shoots (36%) of Chinese chives. Flavonoid, soluble sugar, and soluble protein content were enhanced by 18%, 8.5%, and 4.6%, respectively, in DSRF compared to TF. Nitrate content of the SRF and SRFR decreased significantly by 26% and 35%, respectively. In addition, there was a significant increase in soil nutrient and enzyme activity in the middle and late harvest of Chinese chives under DSRF compared to TF, and there was a high correlation between soil nutrients and the quality of Chinese chives. The available P and total P content significantly differed among the different greenhouse soil samples, and this significantly affected the quality of Chinese chives. The content of available P and total P in greenhouse soil was 125.07 g kg−1 and 1.26 mg kg−1, respectively. Optimal quality was obtained. Hence, the application of DSRF promoted the growth of Chinese chives and improved soil fertility, thereby enhancing the productivity and quality of Chinese chives.

Sugar apple seedling production as a function of substrates and slow-release fertilizer

There is still a lack of studies on the effect of slow-release fertilizers and substrates on the production of high-quality sugar apple seedlings. In this context, the present study aimed to evaluate the quality and biomass of sugar apple seedlings grown in organic substrates at doses of slow-release fertilizer. The experimental design was randomized blocks in split-plot scheme, with four replicates and eleven plants per plot. Substrates were evaluated in the plots (fresh sugarcane bagasse; enriched sugarcane bagasse; coconut powder; commercial organic substrate Tropstrato®), whereas the doses of the slow-release fertilizer Osmocote® were evaluated in the subplots (0; 3; 6; 9; 12 and 15 kg m-3 of substrate). Substrates and slow-release fertilizer doses had effect on the formation of sugar apple seedlings. The effect of slow-release fertilizer is influenced by the substrate used in the formation of sugar apple seedlings. The substrate coconut powder showed the best performance for E%, NL and LAI in sugar apple plants, which reinforces its recommendation to be used in seedling production. For the studied conditions, based on the DQI, we recommend coconut powder associated with the slow-release fertilizer dose of 9 kg m-3 to produce sugar apple seedlings.

Alleviation of salt stress and improvement of Fe accumulation in wheat grain, using slow-release fertilizer enriched with Fe

Low availability of iron (Fe) in calcareous and saline soils is one of the major causes of diminished production of crops such as wheat. This study investigated the effects of slow-release fertilizers enriched with Fe, on some qualitative and biochemical traits of new wheat (Triticum aestivum L.) cultivar, Narin, under salt stress. For this purpose, a greenhouse experiment was conducted to evaluate different levels of Fe fertilizer application including non-fertilizer application, ferrous sulfate at 10 and 20 mg kg−1, and super-absorbent fertilizer enriched with Fe equivalent 10 and 20 mg kg−1 ferrous sulfate on wheat plants under three levels of salt stress (0, 8, and 12 dS m−1). The fertilizer application improved chlorophyll a, total chlorophyll, soluble sugars, K+ concentration, grain Fe content, and 100-grain weight. The salinity increased proline and Na+ content in the leaves, causing a considerable decline in the total soluble carbohydrate, 100-grain weight, K+/Na+ ratio, and protein content of the leaves. The slow-release fertilizer enriched with Fe was more effective in enhancing the grain quality and salt stress tolerance than ferrous sulfate because of raising grain Fe content, soluble sugars, K+ concentration, and K+/Na+ ratio of the leaf. These results suggest that application of the proper type of iron-containing fertilizers, including slow-release fertilizers, and replacing them with common fertilizers would help wheat plants cope with salinity.

Effect of slow release fertilizers on growth and fruiting of Khalas date palm

The current investigation was carried out during 2018 and 2019 seasons to study the effect of some fertilizer practices on yield, fruit quality and some mineral content of Khalas date palm grown in a private farm, Luxor Governorate, Egypt. Results showed that significant improved due to use slow release fertilizers as well as comparing total soluble fertilizers in terms of vegetative growth and nutritional status yield, bunch weight and fruit quality during both seasons. Using 600 g of N and 300 g of K via slow release fertilizers form had improved the growth and nutrient status of date palms as well as increase the fertilization efficiency. Also, it could be suggested that fertilizing by 60 to 75 of RDN and RDK via slow release fertilizers to improve the nutrient status of palm and gave the high bunch weight and consequently high yield/palm. Moreover, these fertilization treatments via slow release form gave high yield with good fruit quality compared with using 100% of RDN and RDK via mineral source during both studied seasons. On the light of previous results, it could be concluded that Fertilizing the palm by 60 to 75% of recommended doses of fertilization via slow release form to get high yield with good fruit quality. In addition, reduce the environmental pollution and increase the fertilization efficiency.

Effects of Slow-release Fertilizers and Sugarcane-specific fertilizers on Yield and Quality of Sugarcane

Effects of Slow-release Fertilizers and Sugarcane-specific fertilizers on Yield and Quality of Sugarcane

Effect of slow-release fertilizer and humic acid application on New Guinea impatiens (Impatiens haawkeri “Divine Scarlet Red”) transplant production quality

Effect of slow-release fertilizer and humic acid application on New Guinea impatiens (Impatiens haawkeri “Divine Scarlet Red”) transplant production quality

Đánh giá hiệu quả của phân bón tan chậm đến sinh trưởng và năng suất lúa vụ Hè Thu 2016 trên vùng đất nhiễm phèn, tỉnh Đồng Tháp

In rice cultivation, fertilizer expense is about 30% of total input, but its overuse cause environmental pollution. Therefore, the study "Evaluating the effect of slow release fertilizer on growth and yield" was carried out in Phu Cuong cooperative, Tam Nong district, Dong Thap province during the 2016 Summer-Autumn crop, on slightly sulfate soil in order to increase fertilizer efficiency. The experiment was arranged in the randomized complete block of 6 fertilizer treatments with 3 replications. Slow release fertilizer is the common chemical N-P-K fertilizers covered by polymer in order to control the solubility according to the need of rice plant in all growth stages, so slow release fertilizer wasapplied onlyone time before the final soil preparation. Experimental results showed that slow releasefertilizer provided enough nutrients for whole rice crop. In particular, slow release fertilizer treatment with N-P-K: 60-46-39 achieved the highest efficiency. It was equal to 50% nitrogen, 57% phosphorus and 65% potassium of traditional treatment's formula, while obtained the same quality and yield, and low pest damage.

MORTALIDADE, CRESCIMENTO E SOLUÇÃO DO SOLO EM EUCALIPTO COM APLICAÇÃO DE FERTILIZANTE DE LIBERAÇÃO LENTA

RESUMO A fertilização é uma das maneiras para aumentar a produtividade e a utilização de fertilizantes de liberação lenta pode ser vantajosa, permitindo a assimilação dos nutrientes à medida que as plantas crescem. O objetivo deste trabalho foi avaliar o efeito da utilização de fertilizante de liberação lenta no crescimento inicial de um plantio de Eucalyptus urophylla x E.grandis, visando reduzir o número de fertilizações de cobertura. O delineamento experimental foi o de blocos ao acaso, com quatro tratamentos fornecendo as mesmas quantidades de nutrientes, porém variando o parcelamento e a fonte do fertilizante: T1-Fertilizante convencional com aplicação parcelada; T2-Fertilizante convencional com aplicação em dose única aos três meses; T3-Fertilizante de liberação lenta no plantio; e T4-Fertilizante de liberação lenta aos três meses. Foram avaliadas as seguintes características: mortalidade, altura, DAP, volume de madeira, teores foliares dos macronutrientes e de N e K na solução do solo. A mortalidade média foi de 4%, altura de 8,5 m, DAP de 7,5 cm e volume de 24 m3.ha-1, aos 18 meses de idade, não diferindo entre os tratamentos. Apenas o teor foliar de K diferiu entre os tratamentos, sendo a menor concentração com a aplicação parcelada do fertilizante. A aplicação do fertilizante de liberação lenta aos três meses proporcionou os menores teores na solução do solo. A aplicação parcelada dos nutrientes não resultou em ganho de produtividade ou benefícios nutricionais. O uso de fertilizantes de liberação lenta possibilita a redução do número de fertilizações de cobertura, sem o risco de lixiviação dos nutrientes.

몇 가지 완효성비료가 채소류의 생육에 미치는 영향

몇 가지 완효성비료가 채소류의 생육에 미치는 영향

Effect of Slow Release Fertilizer on Nitrogen Use Efficiency for Grain Yield in Chinese High-Yielding Rice Cultivars

Effect of Slow Release Fertilizer on Nitrogen Use Efficiency for Grain Yield in Chinese High-Yielding Rice Cultivars

Effect of Slow Release Fertilizer on Nitrogen Absorption and Fertilizer Nitrogen Recovery Rate in Chinese High-Yielding Rice Cultivars

中国における水稲の多収穫多施肥栽培において施肥窒素（N）吸収率の向上を目的とし，多収性水稲品種のN吸収に及ぼす緩効性肥料の施用効果を調査した．緩効性肥料の施用は，中国産多収性品種の揚稲4号（YD）および武育粳3号（WY）において幼穂形成期までの肥料由来N吸収量を有意に増加させた．この結果，施肥N吸収率が有意に増加し，YDでは成熟期N含有量の有意な増加も認められた．YDは幼穂形成期から出穂期にかけてのN吸収量が高かったが，WYはより早い時期のN吸収量が高く，YDに対してはWYより肥効の長い緩効性肥料の施用が有効であると推察される．YDの施肥N吸収率は，シグモイド型緩効性肥料（S区）＞リニア型緩効性肥料（L区）＞塩安の分施（C区）の傾向があり，施肥N量の増加に伴いC区では有意に増加したが，S区およびL区では有意な変化は認められなかった．以上のことから，YDへの緩効性肥料，特にシグモイド型肥料の施用は施肥N吸収率が高いこと，それにより施用量の削減が可能であることから，環境負荷の軽減に有効であると考えられた．

緩効性肥料を用いたパン用小麦品種「ゆめちから」の収量と子実タンパク含有量(平成23年度年次講演会一般講演)

緩効性肥料を用いたパン用小麦品種「ゆめちから」の収量と子実タンパク含有量(平成23年度年次講演会一般講演)

Effects of Slow-Release Fertilizers on Turf Quality in a Turf Mixture

A 2-year field study was conducted to determine the influence of the timing of application and different slow release nitrogen (N) sources with different nitrogen rates on the growth and quality of a turfgrass mixture. Three different timings were used for nitrogen application: annually, once every 3 months, and once every 6 months. Three nitrogen sources (ammonium nitrate and two slow-release fertilizers, Entec and Osmocote) were used in the trial. Annually applications were carried out at rates of 0 (control) g m −2 , 30 g m −2 , 60 g m −2 , 90 g m −2 . Results of this study showed that both slow-release fertilizers had significantly higher ratings of color and quality and significantly higher clipping yields compared with the control (ammonium nitrate) during the fall and winter seasons. During the other seasons, the slow-release fertilizers produced equal, slightly higher or slightly lower color and quality ratings and clipping yields, compared with the control. It should be noted that an acceptable color rating and turf quality were obtained in the fall and winter seasons with 60 and 90 g N m -2 yr –1 of slow release fertilizers.

Effect of slow-release fertilizer on the root system andphotosynthesis of flue cured tobacco

Effect of slow-release fertilizer on the root system andphotosynthesis of flue cured tobacco

Effect of slow release fertilizers on container-grown woody plants

Slow-Release Fertilizers (SRF) Silvamix Forte and Silvagen were tested in two-year experiments with container-grown woody plants (<i>Pyracantha coccinea</i>, <i>Thuja occidentalis</i>). Several fertilizing systems were compared: preplant application of SRF into substrate as the sole nutrient source for a two-year period, preplant application of SRF and soluble fertilizer (PG Mix), and preplant application of SRF and soluble fertilizer together with additional fertilizing by solution of nitrogen fertilizer during both growing periods. A system with controlled-release fertilizer (CRF) Osmocote 5−6 was chosen as a control variant; it was incorporated into substrate before planting in the first year and top-dressed in the second year. CRF Plantacote 6M (mixed into substrate before planting and top-dressed in the second year) and Osmocote 16−18 applied only before planting were tested, too. The experiments showed that SRF Silvamix Forte and Silvagen give results comparable with CFR provided that they were incorporated together with soluble ferti-lizer dose and plants were fertilized by solution of nitrogen fertilizer during both growing periods.

SLOW-RELEASE FERTILIZATION REDUCES NITRATE LEACHING IN BAREROOT PRODUCTION OF PINUS STROBUS SEEDLINGS

The nitrate (NO3 - ) leaching potential from bareroot tree nurseries is great, yet no researchers have investigated the effect of slow release fertilization on NO3 - leachate concen- trations. The effects of slow release fertilizer on nitrate-nitrogen (NO3-N) leachate concentra- tions, seedling morphology and nutrient content, soil nitrogen (N), and cation leachate concen- trations were studied in the bareroot production of Pinus strobus (L.) (eastern white pine) seedlings in southwestern Wisconsin. Three fertilizer treatments were used: slow release 1 (SRF1, 19N:6P2O5:1K2O); slow release 2 (SRF2, 12N:0P2O5:42K2O); and a conventional fertil- izer (Conv, 15.5N:0P2O5:0K2O). A total of 180 and 52 kg N/ha (161 and 47 lb/ac) were applied in the Conv and SRF treatments, respectively. Over a 2-year period, soil leachate concentrations were collected weekly (May to December) from porous cup samplers installed at a depth of 1 m (3.3 ft) below the surface; soil was collected every 2 weeks, and plant tissue was collected once at the end of each growing season (late August). There were no differences in seedling morphology (height, diameter, dry mass) during the first or second growing season. Seedling nutrient concentrations were the same for all treatments at the end of first growing season, but Conv-treated seedlings contained greater concentrations of N (33 g/kg N for Conv compared to 30 g/kg for SRF) by the end of the second growing season. Nitrate-N leachate concentrations were greater for the Conv treatment compared to both SRF treatments during the first and second growing seasons. However, treatment did not affect cation leachate concentrations. Similarly, there was little difference in soil N among treatments. Overall, SRF reduced NO3-N leachate concentrations in bareroot nursery tree production without sacrificing seedling quality.

Effect of slow release fertilizer on the growth of containerized flannel flower (Actinotus helianthi Labill.)

Effect of slow release fertilizer on the growth of containerized flannel flower (Actinotus helianthi Labill.)

Effects of slow release fertilizers on microbial biomass in submerged soil microcosms without plants(The Annual Meeting of the Society in 2001)

Effects of slow release fertilizers on microbial biomass in submerged soil microcosms without plants(The Annual Meeting of the Society in 2001)