水稻氮高产高效与低产低效两类品种株型特征差异研究

doi:10.3724/SP.J.1006.2010.01011

Abstract

Abstract:

A field experiment with 225 kg ha^-1 N fertilizer application was carried out in 2006 and 2007 on the farm of Yangzhou university, Jiangsu province, China. Using 12 rice genotypes (six N-efficient and six N-inefficient) selected from 120 rice cultivars grown in Yangzhou during 2004 and 2005 to investigate the relationship among the plant-type characteristics, N use efficiency and yield performance. The results showed that the top three leaves length and drop-angle of high yield and N-efficient rice genotypes were 9.29%, 65.3% lower than those of the low yield and N-inefficient ones, and the width of the top three leaves, population LAI, valid LAI, high valid LAI and LW/LA(leaves weight/leaves area) of the former of were 29.25%, 8.27%, 13.32%, 6.66%, and 5.82% higher than those of the latter on average respectively. The high yield and N-efficient genotypes had higher lodging resistance capability and more reasonable distribution for the length of internodes on stem than the low yield and N-inefficient ones. Yield and N use efficiency negatively correlated (significantly at P<0.05 or P<0.01) with the length and drop-angle of the top three leaves, while positively correlated(significantly at P<0.05 or P<0.01)with the width of the top three leaves, population LAI, valid LAI, high valid LAI, SLW, anti-broken strength, bender moment, and lodge index. Especially, the length and width of the flag and top 3rd leaves played an important role in the N use efficiency. It was indicated that good plant-type structure is a prerequisite for N use efficiency.

Key words: Rice, Plant-type characteristics, N use efficiency, Yield

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Differences of Plant-Type Characteristics between Rice Cultivars with High and Low Levels in Yield and Nitrogen Use Efficiency

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