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Effects of different water regimes and nitrogen application strategies on grain filling characteristics and grain yield in hybrid rice

Author:
Sun, Yongjian, Yan, Fengjun, Sun, Yuanyuan, Xu, Hui, Guo, Xiang, Yang, Zhiyuan, Yin, Yaozhu, Guo, Changchun, Ma, Jun
Source:
Archiv für Acker- und Pflanzenbau und Bodenkunde 2018 v.64 no.8 pp. 1152-1171
ISSN:
1476-3567
Subject:
correlation, fertilizer application, filling period, grain yield, hybrids, irrigation management, leaves, nitrogen, nitrogen fertilizers, panicles, rice, seeds, spikelets, tillering
Abstract:
In order to optimize N application and understand how the different combinations of water and N management affect grain filling characteristics and yield, we designed three irrigation regimes (W₁ submerged irrigation, W₂ alternate irrigation, W₃ dry cultivation), and different N application strategies at 180 kg ha⁻¹ in 2010 and 2011. The relationship between grain filling characteristics and grain yield formation were respectively investigated. The results revealed that there were obvious interacting effects of irrigation regime and N application strategies on grain yield and grain-filling characteristics as well. Compared with W₁ and W₃ treatments, under W₂, the N-fertilizer should account for 30% base, 30% tillering, and 40% panicle fertilizer with the last being applied equally at 4th and 2nd leaves emerged from the top. Correlation analysis revealed that grain filling rate during middle grain-filling stage was the largest and contribute more than 50% to grain-filling. Grain yield was significantly related to grain filling rate (Gₘₐₓ or Gₘₑₐₙ), final weight of a kernel (A), and mean grain filling rate (MGR) of the early, mid and late stages during grain filling in inferior spikelets, which is the important reason for water and N coupling effect further to increase yield and fertilizer use efficiency.
Agid:
5952561