Effects of Polyaspartic Urea Application Methods on Nitrogen Balance and Rice Yield in Cold Region of China
Received date: 2022-01-16
Online published: 2022-07-21
Using Suigeng 18 as the test material, a two-year field experiment was conducted to explore and optimize the application methods of polyaspartic acid urea and conventional urea on nitrogen balance and rice yield. The results showed that compared with the control without fertilization, the application of polyaspartic urea （in two and four applications） and the conventional urea in four applications significantly increased the dry matter mass and nitrogen content of rice panicles, culm and leaves, and reduced soil NO3- and NH4+ leaching, Among them, the treatment with four applications of polyaspartic urea had the best effect, showing the highest for the nitrogen concentrations in grains and milled rice, effective panicle number, total grain number as well as other indicators, and the rice yield was significantly increased by 10.24% to 48.07% in 2019 and 18.95% to 51.91% in 2020 compared with other treatments.
Key words： rice; polyaspartic; nitrogen application method; grain yield
DAI Ming, GUO Haibin, WEI Yadong . Effects of Polyaspartic Urea Application Methods on Nitrogen Balance and Rice Yield in Cold Region of China[J]. China Rice, 2022 , 28(4) : 74 -78 . DOI: 10.3969/j.issn.1006-8082.2022.04.015
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