栽插密度与施氮量对双季稻上部三叶叶长和叶角的影响

doi:10.3724/SP.J.1006.2010.01743

Abstract

Abstract: An experiment was conducted with early rice Zhongzao 22 and late rice Tianyouhuazhan with split-plot design in 2007 and 2008. The results showed that the grain yield increased with increasing planting density in low nitrogen application condition, while the lower planting density was favorable to higher grain yield in higher nitrogen application condition. The lengths of the top three leaves were increased with increasing applied nitrogen amount or decreasing planting density. There were a parabolic relationship of grain yield with basal angle, opening angle and length of the top three leaves of Zhongzao 22, and with basal angle and opening angle of the top three leaves of Tianyouhuazhan, and a linear relationship of grain yield with the length of the top three leaves of Tianyouhuazhan. The optimum values of basal angle, opening angle and length of the flag leaf of Zhongzao 22 for high yield were 11.37°, 7.81°, 29.74 cm, those of the second leaf from top were 17.27°, 16.06°, 36.08 cm, and those of the third leaf from top were 21.76°, 24.70°, 39.02 cm, respectively; the optimum values of the basal angle and opening angle of the flag leaf of Tianyouhuazhan were 11.62°, 12.30°, those of the second leaf from top were 32.61°, 30.08° and those of the third leaf from top were 23.55°, 31.21°, respectively.

Key words: Double-cropping rice, Nitrogen application amount, Planting density, Top three leaves, Leaf length, Leaf angle

LIN Hong-Xin, PAN Xiao-Hua, SHI Qing-Hua, PENG Chun-Rui, WU Jian-Fu. Effects of Nitrogen Application Amount and Planting Density on Angle and Length of Top Three Leaves in Double-Cropping Rice[J].Acta Agron Sin, 2010, 36(10): 1743-1751.

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Effects of Nitrogen Application Amount and Planting Density on Angle and Length of Top Three Leaves in Double-Cropping Rice

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