Effects of modified polyaspartic acid urea basal application in paddy field

ZHAO Ying; WANG Na; NIU Shiwei; ZHANG Xin; XU Jiayi; SUI Shijiang; REN Xuan

doi:10.19303/j.issn.1008-0384.2022.008.003

Volume 37 Issue 8

Aug. 2022

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Article Navigation > Fujian Journal of Agricultural Sciences > 2022 > 37(8): 977-984

ZHAO Y, WANG N, NIU S W, et al. Effects of modified polyaspartic acid urea basal application in paddy field [J]. Fujian Journal of Agricultural Sciences，2022，37（8）：977−984 doi: 10.19303/j.issn.1008-0384.2022.008.003

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ZHAO Y, WANG N, NIU S W, et al. Effects of modified polyaspartic acid urea basal application in paddy field [J]. Fujian Journal of Agricultural Sciences，2022，37（8）：977−984 doi: 10.19303/j.issn.1008-0384.2022.008.003

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Effects of modified polyaspartic acid urea basal application in paddy field

doi: 10.19303/j.issn.1008-0384.2022.008.003

1.
Liaoning Academy of Agricultural Sciences, Shenyang, Liaoning　110161, China
2.
Liaoning Fuyou Grain and Oil Trading Co., Ltd., Shenyang, Liaoning　110164, China

Received Date: 2022-03-16
Rev Recd Date: 2022-05-07

Available Online: 2022-10-05

Publish Date: 2022-08-28

Abstract

Abstract

Objective In order to evaluate the effects of modified polyaspartic acid (PASP) urea with different molecular weights on rice yield, nitrogen use efficiency and nitrogen（N）concentrations in the surface water of paddy fields. Method The Liaohe River delta, a rice-producing area in Liaoning Province, was selected as the experimental area, Modified PASP with different molecular weights was combined with urea. Then the effects of modified PASP urea with different molecular weights on N concentrations in the paddy field ponding water, rice growth, N uptake and utilization were studied under the condition of reduced nitrogen application. And the effects of basal modified PASP urea application with different molecular weights in paddy field were comprehensively evaluated by Grey Relational Analysis. Result The results showed that modified PASP urea treatment tests decreased the N concentrations in the surface water compared with the large particle urea treatment test. In particular, NH₄⁺-N concentrations in the surface water in 7500mw, 10000mw and 12500mw modified PASP urea treatments test were significantly reduced by 20.23%～56.66% compared with large particle urea treatment test on the third day after basal fertilization. Among them, NH₄⁺-N concentrations in the surface water in 10000 mw modified PASP urea treatment test was significantly lower (36.84%～45.67%) than 7500,12500 and 14700 mw modified PASP urea treatment tests. The application of 10000 mw modified PASP urea could significantly promote rice growth, nutrient absorption, and increase yield, with a 8.22% higher yield, a 36.47% higher N uptake in grain, a 62.39% higher N absorption in straw, a 38.31 percentage point higher of N use-efficiency, compared to the control. Conclusion Considering rice yield, nitrogen uptake, nitrogen use efficiency and N concentrations in the surface water, basal application of modified PASP urea treatment based on reduced nitrogen application was better than the treatment using large particle urea. Therefore, urea mixed with 10000 mw modified PASP urea is recommended to be used in Liaohe Delta rice region.
- rice,
- modified polyaspartic acid,
- urea,
- grey incidence analysis

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