The Effects of Supplementary Irrigation at Different Stages on Plant Nitrogen Remobilization and Nitrogen Utilization in Spring Maize

doi:10.7668/hbnxb.2016.S1.002

Abstract

Abstract: A two years' field experiment was conducted to investigate the effects of supplemental irrigation at different stages on plant nitrogen(N) remobilization and N use efficiency in spring maize. The maize hybrid Zhengdan 958 was used,and the no irrigation treatment(CK) and four irrigation treatments including irrigated 750 m³/ha at jointing stage(I_V6),12th leaf stage(I_V12),silking stage(I_S) and 15 days after silking(I_S15) were implemented. The results showed that irrigation at vegetative growth stages of spring maize could significantly increase N accumulation in leaf,but not obvious in stem. The treatments of I_V12 and I_S distinctly improved N remobilization efficiency of leaf by 34%-59%. The irrigation treatments significantly increased plant N accumulation of kernel,but the kernel N concentration declined by 3.6%-25.4%. All of the irrigation treatments obviously enhanced the characteristics of N utilization. The partial factor productivity of applied N,N utilization efficiency and N harvest index were improved by 2.8%-11.2%,29.2%-59.4% and 14.3%-25%,respectively,in the normal year. In general,supplemental irrigation enhanced plant N remobilization,improved the characteristics of N utilization,especially,the irrigation at silking stage was the optimal choice for single supplemental irrigation in spring maize.

Key words: Spring maize, Supplemental irrigation, N remobilization, Nitrogen utilization efficiency

CLC Number:

S311
S143.1

GAO Zhen, LÜ Xinyue, WANG Jiahui, LIANG Xiaogui, ZHAO Xue, ZHOU Shunli. The Effects of Supplementary Irrigation at Different Stages on Plant Nitrogen Remobilization and Nitrogen Utilization in Spring Maize[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2016, 31(S1): 11-16. doi: 10.7668/hbnxb.2016.S1.002.

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