The Experts below are selected from a list of 18090 Experts worldwide ranked by ideXlab platform
Juming Yao - One of the best experts on this subject based on the ideXlab platform.
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an eco friendly slow release Urea Fertilizer based on waste mulberry branches for potential agriculture and horticulture applications
ACS Sustainable Chemistry & Engineering, 2014Co-Authors: Yong Zhang, Xiying Liang, Xiaogang Yang, Hongyi Liu, Juming YaoAbstract:Development of a compound Fertilizer for agricultural and horticultural applications remains an important challenge in the field of biomass synthesis on account of its raw material source and biodegradability. In this work, an eco-friendly slow-release Urea Fertilizer (SRUF) employing mulberry branch-g-poly(acrylic acid-co-acrylamide) (MB/P(AA-co-AM)) superabsorbent was prepared. The MB/P(AA-co-AM) superabsorbent was blended with sodium alginate, Urea, and CaCl2 solutions to accomplish this synthesis process. The synthesis conditions of the SRUF and its application performance were examined. The results showed that under the optimal synthesis conditions the water absorbency and water absorbency rate of the SRUF reached 420.0 g/g and 60.0 (g/g)/min in deionized water, respectively. The water retention of the SRUF was 7.2 wt % after 25 d. The Urea release in deionized water and soil both exhibited a typical slow release behavior. A degradation rate of 32.0 wt % was attained for the SRUF while it was buried ...
Fupeng Song - One of the best experts on this subject based on the ideXlab platform.
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effects of sulfur and polymer coated controlled release Urea Fertilizers on wheat yield and quality and Fertilizer nitrogen use efficiency
Journal of Applied Ecology, 2012Co-Authors: Fupeng SongAbstract:: A field experiment was conducted to study the effects of sulfur- and polymer-coated controlled release Urea Fertilizers on wheat yield and its quality, plow layer soil inorganic nitrogen (N) contents, and Fertilizer N use efficiency. Compared with traditional Urea Fertilizer, both sulfur- and polymer-coated controlled release Urea Fertilizers increased the grain yield by 10.4%-16.5%, and the grain protein and starch contents by 5.8%-18.9% and 0.3%-1.4%, respectively. The controlled release Urea Fertilizers could maintain the topsoil inorganic N contents to meet the N requirement for the wheat, especially during its late growth stage. In the meantime, the Fertilizer N use efficiency was improved by 58.2%-101.2%. Polymer-coated Urea produced better wheat yield and higher Fertilizer N use efficiency, compared with sulfur-coated controlled release Urea.
Mingzhu Liu - One of the best experts on this subject based on the ideXlab platform.
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preparation and properties of a double coated slow release and water retention Urea Fertilizer
Journal of Agricultural and Food Chemistry, 2006Co-Authors: Rui Liang, Mingzhu LiuAbstract:A double-coated, slow-release, and water-retention Urea Fertilizer (DSWU) was prepared by cross-linked poly(acrylic acid)-containing Urea (PAAU) (the outer coating), polystyrene (PS) (the inner coating), and Urea granule (the core). Elemental analysis results showed that the nitrogen content of the product was 33.6 wt %. The outer coating (PAAU) regulated the nitrogen release rate and protected the inner coating from damage. The slow-release property of the product was investigated in water and in soil. The possible mechanism of nitrogen release was proposed. The influences of PS coating percentage, temperature, water absorbency, and pH on the release of nitrogen were also investigated. It was found that PS coating percentage, temperature, and water absorbency had a significant influence on the release of nitrogen. However, the pH had no effect. The water-retention property of the product was also investigated. The results showed that the product not only had a good slow-release property but also excellent water-retention capacity, which could effectively improve the utilization of Fertilizer and water resources. The results of the present work indicated that the DSWU would find good application in agriculture and horticulture, especially in drought-prone areas where the availability of water is insufficient.
Yuechao Yang - One of the best experts on this subject based on the ideXlab platform.
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bio based interpenetrating network polymer composites from locust sawdust as coating material for environmentally friendly controlled release Urea Fertilizers
Journal of Agricultural and Food Chemistry, 2016Co-Authors: Shugang Zhang, Yuechao Yang, Yuncong Li, Chenhao ZhaoAbstract:A novel polymer-coated nitrogen (N) Fertilizer was developed using bio-based polyurethane (PU) derived from liquefied locust sawdust as the coating material. The bio-based PU was successfully coated on the surface of the Urea Fertilizer prills to form polymer-coated Urea (PCU) Fertilizer for controlled N release. Epoxy resin (EP) was also used to further modify the bio-based PU to synthesize the interpenetrating network (IPN), enhancing the slow-release properties of the PCU. The N release characteristics of the EP-modified PCU (EMPCU) in water were determine at 25 °C and compared to that of PCU and EP-coated Urea (ECU). The results showed that the EP modification reduced the N release rate and increased the longevity of the Fertilizer coated with bio-based PU. A corn growth study was conducted to further evaluate the filed application of the EMPCU. In comparison to commercial PCU and conventional Urea Fertilizer, EMPCU was more effective and increased the yield and total dry matter accumulation of the co...
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biobased polymer composites derived from corn stover and feather meals as double coating materials for controlled release and water retention Urea Fertilizers
Journal of Agricultural and Food Chemistry, 2013Co-Authors: Yuechao Yang, Zhaohui Tong, Yuqing Geng, Min ZhangAbstract:In this paper, we synthesized a biobased polyurethane using liquefied corn stover, isocyanate, and diethylenetriamine. The synthesized polyurethane was used as a coating material to control nitrogen (N) release from polymer-coated Urea. A novel superabsorbent composite was also formulated from chicken feather protein (CFP), acrylic acid, and N,N'-methylenebisacrylamide and used as an outer coating material for water retention. We studied the N release characteristics and water-retention capability of the double-layer polymer-coated Urea (DPCU) applied in both water and soils. The ear yields, dry matter accumulation, total N use efficiency and N leaching from a sweet corn soil-plant system under two different irrigation regimes were also investigated. Comparison of DPCU treatments with conventional Urea Fertilizer revealed that DPCU treatments reduced the N release rate and improved water retention capability. Evaluation of soil and plant characteristics within the soil-plant system revealed that DPCU application effectively reduced N leaching loss, improved total N use efficiency, and increased soil water retention capability.
Bernie J Zebarth - One of the best experts on this subject based on the ideXlab platform.
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soil microbial community response to controlled release Urea Fertilizer under zero tillage and conventional tillage
Applied Soil Ecology, 2010Co-Authors: Newton Z Lupwayi, C A Grant, Y K Soon, G W Clayton, Shabtai Bittman, S S Malhi, Bernie J ZebarthAbstract:Abstract Soil microorganisms mediate many important biological processes for sustainable agriculture. The effect of a polymer-coated controlled-release Urea (CRU, ESN®) on soil microbial communities was studied at six sites across western Canada from 2004 to 2006. Fertilizer treatments were CRU, Urea and an unfertilized control. Timing of Fertilizer application (fall vs. spring) was studied in 9 of the 18 site-years (combinations of sites and years). Wheat (Triticum aestivum L.), canola (Brassica napus L.) and barley (Hordeum vulgare L.) were grown in rotation at five sites, and silage corn (Zea mays L.) was grown in all 3 years at one site, under conventional tillage (CT) or zero tillage (ZT). The Fertilizers were side-banded at 50–60 kg N ha−1 for wheat, barley and canola, and broadcast at 150 kg N ha−1 for corn. Microbial biomass C (MBC) and bacterial functional diversity and community-level physiological profiles (CLPPs) were determined at about the flowering stage of each crop. In situ CO2 evolution (soil respiration) was measured, and microbial metabolic quotient (qCO2) determined, at one site in 2 years. In the rhizosphere, Fertilizer effects on MBC and functional diversity were observed in 1 and 5 of 18 site-years, respectively; and in bulk soil in 4 site-years each. These effects were usually positive relative to the control. CRU increased MBC or functional diversity more than Urea in 3 site-years, but the opposite was observed in 1 site-year. Time of Fertilizer application affected MBC in 1, and functional diversity in 2, of 9 site-years in the rhizosphere, and no effects were observed in bulk soil. Fall-applied Fertilizer increased MBC more than spring-applied Fertilizer, but the opposite was observed for functional diversity. Tillage affected MBC and functional diversity in 4 and 5 of 18 site-years, respectively, in the rhizosphere, and in 3 and 4 site-years in bulk soil. Tillage effects were usually in favour of ZT. There were no treatment effects on CO2 evolution, but an interactive effect of Fertilizer and tillage on qCO2 was observed in 1 year when qCO2 in the control treatment was greater than that in either Fertilizer treatment under CT, but Urea increased qCO2 relative to the control under ZT. Shifts in CLPPs were sometimes observed where the treatment effects described above were not significant. Notwithstanding the limitations of culture-dependent CLPPs, most Fertilizer effects on soil microbiological properties were not statistically significant. Therefore, these Fertilizers probably did not adversely affect most soil biological processes.
