夏玉米各器官氮素积累与分配动态及其对氮肥的响应

doi:10.3724/SP.J.1006.2013.00506

Abstract

Abstract:

A successive two years′ field experiment with five N application rates was conducted using hybrid Zhengdan 958. The results showed that the process of N accumulation in all organs except grain conformed to a unimodal curve in the whole life cycle. The N accumulation in blade, husk and cob reached the peak at around 12 days after silking, and that in stem and sheath at silking stage and then decreased gradually. The N accumulation in grain and the whole plant continuously increased, and the maximum value appeared at maturity. Compared with other organs, blade was more sensitive to N supply and N deficit stress made the N accumulation peak in advance, accelerated blade N remobilization and promoted senescence of blade. N supply significantly improved N accumulation amount and N accumulation rate in all organs at various stages, but did not change the trend of N accumulation. On the whole, the demands of maize organs for N could be met at the N application rate of 180 kg N ha^-1, and a higher grain yield also achieved. According to the maximum value of accumulated N in organs, the contribution of remobilized N from maize organs to grain showed a trend of: blade > stem and sheath > cob > bract, and the mean total contribution rate was 53.3%, of which cob and bract accounted for 12.3%, showing an essential part for grain N, too.

Key words: Summer maize, Organ, Nitrogen fertilizer level, Nitrogen accumulation, Distribution and remobilization

ZHANG Jing-Ting,LIU Yun-Peng,LI Xu-Hui,LIANG Xiao-Gui,ZHOU Li-Li,ZHOU Shun-Li. Dynamic Responses of Nitrogen Accumulation and Remobilization in Summer Maize Organs to Nitrogen Fertilizer[J].Acta Agron Sin, 2013, 39(03): 506-514.

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