
Effects of Different Nitrogen Fertilizers on Rice Growth and Field Water Quality in Rice-crayfish Integrated System
Received date: 2021-12-13
Online published: 2022-07-21
The rice-crayfish integrated model has high comprehensive benefits and is developing rapidly in China. Choosing suitable nitrogen (N) fertilizer for rice-crayfish integrated system can not only ensure the water quality of the field surface, but also ensure the nitrogen supply of rice to promote rice growth, which is very important for the cleaner production of the rice-crayfish integrated system. Three fertilization treatments (CF, basal application of compound fertilizer and topdressing of urea; CRF, one-time application of slow-release compound fertilizer as basal fertilizer; OF, basal application of organic-inorganic compound fertilizer and topdressing of urea) were set up in this experiment, and the no nitrogen fertilizer was used as the control (CK) to study the effects of different fertilization treatments on the water quality of the field water before the tillering stage and the growth of rice in the whole growth period. The results showed that compared with CF and OF treatments, CRF treatment had the best effect on reducing the ammonia nitrogen concentration and nitrite nitrogen concentration in the field water, which was beneficial to the growth of crayfish. Fertilization could increase soil inorganic nitrogen content and promote rice dry matter accumulation. The number of effective panicles, yield, nitrogen fertilizer agronomic efficiency(ANUE) and nitrogen partial production efficiency (PEPN) of rice treated with CRF were significantly high than those of treated with treatments. Compared with CF and OF treatments, the grain yield of CRF treatment increased by 14.26% and 12.84%, the ANUE increased by 64.86% and 54.65%, and the PEPN increased by 15.00% and 13.60%, respectively. In addition, CRF treatment also saved the labor. In conclusion, considering the factors such as field surface water quality, rice growth and nitrogen utilization efficiency, the one-time basal application of slow-release compound fertilizer is a better choice in rice-crayfish integrated model, which is conducive to the sustainable development of this model.
GE Yonghu, HUANG Fei, XIAO Dakang, NIE Xibin, YANG Shuo, DING Zijuan, LI Jintao, Gao Hongjian, YE Xinxin, MEI Jun, ZHANG Yefei, HOU Jun . Effects of Different Nitrogen Fertilizers on Rice Growth and Field Water Quality in Rice-crayfish Integrated System[J]. China Rice, 2022 , 28(4) : 50 -54 . DOI: 10.3969/j.issn.1006-8082.2022.04.011
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