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【Objective】 Nitrogen fertilizer is essential to maintaining crop growth and yield, but its excessive or insufficient application has been a problem facing rice production in China. The purpose of this paper is to investigate the effect of soluble amino acid fertilizers (CWSF) on growth and yield, as well as nitrogen absorption and utilization of the rice. 【Method】 The experiment was conducted in 2018 at a water-saving irrigated rice field. In terms of nitrogen, we compared three CWSF treatments with nitrogen applied at 244 kg/hm2 (CWSF244), 214 kg/hm2 (CWSF214) and 184 kg/hm2 (CWSF184), respectively. The control was traditional fertilization used by local farmers (CF). CWSF in each treatment was applied with irrigation at different fertilization rates. During the experiment, we measured rice growth and yield, as well as nitrogen uptake by the crop. 【Result】 There was no significant difference in canopy height, tiller numbers and chlorophyll content between CWSF and CF. CWSF fertilized less nitrogen than CF, but did not result in noticeable reductions in physiological growth index. CWSF improved the ratio of grain nitrogen uptake to total nitrogen, despite its reduced nitrogen application. Comprehensive analysis showed that CWSF214 was the minimum fertilization for increasing grain nitrogen absorption and utilization of nitrogen fertilizer without leading to a yield loss. We also found that compared to CF, CWSF214-I1 and CWSF214-I2 increased nitrogen absorption efficiency by 18.09% and 27.46%, grain nitrogen content by 13.38% and 11.41%, respectively. 【Conclusion】 Considering water saving, grain yield and nitrogen use efficiency, CWSF214-I1 and CWSF214-I2 are optimal and can be used as an improved nitrogen fertilization, combined with controlled irrigation, for rice production in the low reaches of the Yangtze River. |
