The Experts below are selected from a list of 9333 Experts worldwide ranked by ideXlab platform
Yuechao Yang - One of the best experts on this subject based on the ideXlab platform.
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environmentally friendly slow release Urea Fertilizers based on waste frying oil for sustained nutrient release
ACS Sustainable Chemistry & Engineering, 2017Co-Authors: Xiaoqi Liu, Yuechao Yang, Bin Gao, Yongshan WanAbstract:Novel biobased polyurethane (PU) was synthesized by using waste frying oil-based polyol (WFOP) and isocyanate for slow-release Fertilizers (SRFs). Epoxy resin (EP) was used to modify PU to synthesize the interpenetrating network (IPN) for improving the properties of the coating film. Nine polymer-coated nitrogen (N) Fertilizers were prepared from these composite coating materials. The N release characteristics of the PU-coated Urea (PCU) in water and soil were determined. Degradation behavior of coatings in the soil was evaluated. Results showed that 20% EP in the coating increased the cross-linking density by 77.9%, reduced the coating porosity by 28%, and thus slowed the nutrient release from the PCU significantly. Because of its compact structure, the water absorption rate of the EP-modified PCU shell was slower than that of the unmodified ones. All the PCUs, especially the EP-modified ones, showed excellent slow N release behaviors. In addition, the biopolymers derived from waste frying oil also displ...
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organic silicone modified transgenic soybean oil as bio based coating material for controlled release Urea Fertilizers
Journal of Applied Polymer Science, 2016Co-Authors: Xiaoqi Liu, Yuechao Yang, Bin GaoAbstract:Novel bio-based polyurethanes (PUs) were synthesized from transgenic soybean oil (TSBO) and then modified with hydroxyl-terminated dimethyl silicone (HTMS) to coat Urea prills for controlling nitrogen (N) release. Different kinds of coated Ureas were prepared from these hydrophobic PUs. Physicochemical properties of the coatings were characterized in the laboratory. The N release characteristics of the PU-coated Ureas (PCUs) in water were determined at 25 °C. Experimental results showed that the presence of HTMS in the PUs reduced the coating porosity, increased the water-contact angle of the coating material, and thus slowed the nutrient release from the PCUs. These results suggested that HTMS improved the structure and properties of coating materials for controlled release. These findings showed that bio-based PUs derived from TSBOs made excellent coating material, particularly after HTMS modification, and thus may replace petroleum-based PUs for controlled-release Fertilizers. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44097.
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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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Improving grain yield and reducing N loss using polymer-coated Urea in southeast China
Agronomy for Sustainable Development, 2015Co-Authors: Shenqiang Wang, Guangxi Xing, Yuechao Yang, Xu Zhao, Min Zhang, Hongkun ChenAbstract:The efficiency of classical mineral NPK Fertilizers is usually low because a major part of these Fertilizers does not reach plant roots and ends up polluting groundwaters with nitrates and phosphates. Recently, a novel polymer-coated Urea made from recycled plastics was proposed to enhance N availability in cereal production. To evaluate the efficiency of this polymer for rice production, we set up field plots, microplots, and pot experiments with 15N tracing. We compared rice yield, N uptake, and N loss between conventional three split applications of Urea and a single basal application of four derivatives from the polymer-coated Urea. The four derivatives included a blend with 70 % of N from 6 % (w/w) coated Urea and 30 % from Urea and three coated Urea Fertilizers with 6, 8, and 12 % coating at an identical N application rate during two rice-growing seasons. Results show that 6 % coated Urea improved 15N recovery, reduced 15N loss, and increased grain yield slightly due to an initial 15N burst occurring at high field temperatures after basal fertilization; 8 or 12 % coated Urea better met plant N demand from transplanting to heading, greatly enhanced 15N recovery, and decreased 15N loss and NH3 volatilization. Nevertheless, unlike a significant increase of yield for 12 % coated Urea, 8 % coated Urea did not increase yield due to 15N release and excessive 15N uptake by plants at ripening. Overall, our findings show that a single basal polymer-coated Urea application improves N use efficiency and reduces N loss in rice agroecosystem.
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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.
Min Zhang - One of the best experts on this subject based on the ideXlab platform.
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Improving grain yield and reducing N loss using polymer-coated Urea in southeast China
Agronomy for Sustainable Development, 2015Co-Authors: Shenqiang Wang, Guangxi Xing, Yuechao Yang, Xu Zhao, Min Zhang, Hongkun ChenAbstract:The efficiency of classical mineral NPK Fertilizers is usually low because a major part of these Fertilizers does not reach plant roots and ends up polluting groundwaters with nitrates and phosphates. Recently, a novel polymer-coated Urea made from recycled plastics was proposed to enhance N availability in cereal production. To evaluate the efficiency of this polymer for rice production, we set up field plots, microplots, and pot experiments with 15N tracing. We compared rice yield, N uptake, and N loss between conventional three split applications of Urea and a single basal application of four derivatives from the polymer-coated Urea. The four derivatives included a blend with 70 % of N from 6 % (w/w) coated Urea and 30 % from Urea and three coated Urea Fertilizers with 6, 8, and 12 % coating at an identical N application rate during two rice-growing seasons. Results show that 6 % coated Urea improved 15N recovery, reduced 15N loss, and increased grain yield slightly due to an initial 15N burst occurring at high field temperatures after basal fertilization; 8 or 12 % coated Urea better met plant N demand from transplanting to heading, greatly enhanced 15N recovery, and decreased 15N loss and NH3 volatilization. Nevertheless, unlike a significant increase of yield for 12 % coated Urea, 8 % coated Urea did not increase yield due to 15N release and excessive 15N uptake by plants at ripening. Overall, our findings show that a single basal polymer-coated Urea application improves N use efficiency and reduces N loss in rice agroecosystem.
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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.
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.
Yongshan Wan - One of the best experts on this subject based on the ideXlab platform.
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environmentally friendly slow release Urea Fertilizers based on waste frying oil for sustained nutrient release
ACS Sustainable Chemistry & Engineering, 2017Co-Authors: Xiaoqi Liu, Yuechao Yang, Bin Gao, Yongshan WanAbstract:Novel biobased polyurethane (PU) was synthesized by using waste frying oil-based polyol (WFOP) and isocyanate for slow-release Fertilizers (SRFs). Epoxy resin (EP) was used to modify PU to synthesize the interpenetrating network (IPN) for improving the properties of the coating film. Nine polymer-coated nitrogen (N) Fertilizers were prepared from these composite coating materials. The N release characteristics of the PU-coated Urea (PCU) in water and soil were determined. Degradation behavior of coatings in the soil was evaluated. Results showed that 20% EP in the coating increased the cross-linking density by 77.9%, reduced the coating porosity by 28%, and thus slowed the nutrient release from the PCU significantly. Because of its compact structure, the water absorption rate of the EP-modified PCU shell was slower than that of the unmodified ones. All the PCUs, especially the EP-modified ones, showed excellent slow N release behaviors. In addition, the biopolymers derived from waste frying oil also displ...
Kaifu Zhang - One of the best experts on this subject based on the ideXlab platform.
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Sustainable and Biodegradable Copolymers from SO2 and Renewable Eugenol: A Novel Urea Fertilizer Coating Material with Superio Slow Release Performance
Macromolecules, 2020Co-Authors: Limin Liu, Yunfei Zhi, Wenbo Zhao, Manoj Pudukudy, Qingming Jia, Shaoyun Shan, Kaifu ZhangAbstract:To enhance SO2 utilization, improve fertilizer use efficiency, and minimize the negative environmental impact, the novel slow release sulfur-containing Urea Fertilizers with good biodegradation per...
