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| Effects of polyaspartic-acid/salt on nitrogen loss from paddy surface water and nutrients utilization |
| Received:March 05, 2019 |
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| KeyWord:polyaspartic-acid/salt (PASP);paddy rice;nitrogen of paddy surface water;nutrient utilization |
| Author Name | Affiliation | E-mail | | XU Jia-yi | Institute of Plant Nutrient and Environmental Resources, Liaoning Academy of Agricultural Sciences, Shenyang 110161, China | | | NIU Shi-wei | Institute of Plant Nutrient and Environmental Resources, Liaoning Academy of Agricultural Sciences, Shenyang 110161, China | | | SUI Shi-jiang | Institute of Plant Nutrient and Environmental Resources, Liaoning Academy of Agricultural Sciences, Shenyang 110161, China | | | ZHANG Xin | Institute of Plant Nutrient and Environmental Resources, Liaoning Academy of Agricultural Sciences, Shenyang 110161, China | | | YE Xin | Institute of Plant Nutrient and Environmental Resources, Liaoning Academy of Agricultural Sciences, Shenyang 110161, China | | | CAI Guang-xing | Institute of Plant Nutrient and Environmental Resources, Liaoning Academy of Agricultural Sciences, Shenyang 110161, China | | | WANG Na | Institute of Plant Nutrient and Environmental Resources, Liaoning Academy of Agricultural Sciences, Shenyang 110161, China | wnsxh1999@126.com |
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| Abstract: |
| To investigate the effects of polyaspartic-acid/salt (PASP) on paddy nitrogen (N) loss and nutrients utilization, PASP-Ca/Zn and modified PASP-Ca/Zn were used for pot experiments conducted in a rainproof tank. We evaluated the impacts of PASP on N concentrations in surface water, rice growth and its N, P, K uptake, and soil nutrients. The results showed that PASP treatments decreased NH4+-N, NO3--N, and TN concentrations of surface water, with 16.8%~44.7% lower NH4+-N and 20.4%~42.8% lower NO3--N in PASP than the control in day 3 d and 5 d after fertilization, respectively. Addition of PASP promoted rice growth and yield; modified PASP-Ca/Zn significantly increased rice height (12.0%), productive tillers (13.8%), straw yield (9.26%), and grain N concentration (8.32%), with 8.4% higher N use efficiency. NH4+-N concentrations in paddy soil were significantly increased by 28.4%~62.2% in PASP treatments compared to the control, whereas no significant difference in soil available P and K was observed. Considering rice yield, nutrients utilization, and N loss risk of surface water, modified PASP-Ca/Zn was more effective than PASP-Ca/Zn. In this study, modified PASP-Ca treatment was evaluated to be the best, with grain yield 9.21% greater and NH4+-N of the surface water 44.7% lower than the control. However, PASP application effects need to be verified further by field experiments. |
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