Effects of Reduced Nitrogen Fertilizer on the Source and Sink Characteristics of Early /Late Season Rice in South China and Their Mechanism

doi:10.7668/hbnxb.2013.05.035

Abstract

Abstract: Effects of N fertilizer (Conventional N (187.5 kg/ha),reduction of N by 28%(135.0 kg/ha) and without N(0 kg/ha)) on rice sink and source characteristics were studied using four varieties (Yuejingsimiao 2, Guixiangzhan,Huayou 8305 and Tianyou 998 ) in field experiment. Compared by conventional N,reduction of N by 28%would maintain or promote the rice source and sink coordination,which resulted in no significant decrease in yield.Reduction of N by 28%increased grain yield by 11.99%,5.51%and 6.46%for Yuejingsimiao 2,Guixian-gzhan and Huayou 8305, rexpectively, due to enhancement of photosynthetic or the transfer ability of sheath and stem. Reduction of N by 28%improved sink capacity and ratio of spikelets No. and leaf area in Yuejingsimiao 2 and Guixiangzhan,improved available filled ratio of sink in Huayou 8305, while there was no significant difference in Tianyou 998.

Key words: Early /late season rice, Yield, Nitrogen reduction, Source and sink characteristics

CLC Number:

S511.3

MO Zhao-wen, LI Wu, DUAN Mei-yang, PAN Sheng-gang, TIAN Hua, TANG Xiang-ru. Effects of Reduced Nitrogen Fertilizer on the Source and Sink Characteristics of Early /Late Season Rice in South China and Their Mechanism[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2013, 28(5): 206-212. doi: 10.7668/hbnxb.2013.05.035.

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