Optimize nitrogen fertilization location in root-growing zone to increase grain yield and nitrogen use efficiency of transplanted rice in subtropical China
WU Meng1, LIU Ming1, LIU Jia1, LI Wei-tao1, JIANG Chun-yu1, LI Zhong-pei1, 2
1 State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, P.R.China 2 Graduate University of Chinese Academy of Sciences, Beijing 100049, P.R.China
Abstract The optimized nitrogen fertilization location differs in different rice-growing regions. We optimized nitrogen deep-point application in root-growing zone (NARZ) for transplanted rice in subtropical China. Field plot experiments were conducted over two years (2014–2015) in a double-rice cropping system to evaluate the effects of nitrogen (N) fertilizer location on grain yield and N use efficiency (NUE). Four different nitrogen deep-point application methods (DN) were compared with traditional broadcast application (BN) using granular urea. The results showed that grain yield, recovery efficiency of N (REN), agronomic efficiency of N (AEN), and partial factor productivity of N (PFPN) significantly increased 10.3–63.4, 13.7–56.7, 24.7–201.9 and 10.2–63.4%, respectively, in DN treatment compared to BN, respectively. We also find that DN treatments increased grain yield as well as grain N content, and thus grain quality, in comparison with conventional BN treatment. Correlation analysis indicated that significant improvement in grain yield and NUE mainly resulted from increases in productive panicle number and grain N content. In our proposed NARZ method, granular urea should be placed 0 to 5 cm around the rice seeding at a 12-cm depth druing rice transplanting. In NARZ, balanced application of N, P and K further improved grain yield and NUE over treatments with a single N deep-point application. High N uptake by the rice plant did not cause significant soil fertility depletion, demonstrating that this method could guarantee sustainable rice production.
This work was financially supported by the National Basic Research Program of China (2013CB127401), the National Natural Science Foundation of China (41401258), the Natural Science Foundation of Jiangsu Province, China (BK20131044) and the Natural Science Foundation of Jiangxi Province, China (20142BAB214005).
WU Meng, LIU Ming, LIU Jia, LI Wei-tao, JIANG Chun-yu, LI Zhong-pei. Optimize nitrogen fertilization location in root-growing zone to increase grain yield and nitrogen use efficiency of transplanted rice in subtropical China[J]. Journal of Integrative Agriculture,
2017, 16(09): 2073-2081.
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