扬麦5号在不同播期和基本苗下的经济性状及其相互关系分析

ANALYSIS OF ECONOMIC CHARACTERS AND THEIR INTERRELATIONSHlPS OF YANGMAI No.5 UNDER DIFFERENT SOWING TIME AND BASIC SEEDLINGS

1987～1989年对扬麦5号在不同播期和基本苗下的单株成穗规律以及单株成穗数、小穗数、每穗粒数和干粒重等穗部性状之间的相互关系进行了分析研究,在基本苗4～20万、播期10月9日～11月9日范围内,基本苗越少、播期越早、个体的潜力越大;表现在单株成穗多,结实小穗数增加,退化小穗数减少,小穗平均结实粒数增加,以及穗型大、粒重高。单株成穗数(x)与每穗粒数(y)的关系可用y=ax^b方程加以描述。每穗结实小穗数(x)与每穗粒数(y)的关系可用y=ax+bx^2方程加以描述。每穗退化小穗数(x)与每穗粒数(y)的关系可用y=ae^(bx)方程加以描述。

We investigated and quantitatively described the rule of ear formation per plant and the interrelationships among ears per plant, number of spilelets, grains per ear and weight of 1000 grains in winter wheat Yangmai No.5 under different sowing time and baise seedlings. The result showed that under the condition of basic seedlings 4～20 x 10~4 per mu and sowing time from October 9 to November 9 the less the basic seedlings and earlier sowing time, the larger the potential of single plant which gave more ears per plant, more seeded spikelets, less sterils spikelets more grains per spikelet, larger ear and higher weight of 1000 grains. The relationship between ears per plant (x) and grains per ear (y) could be deseribed by equation (?)= ax^b. The relationship between number of seeded spikelets per car (x) and grains per ear (y)could be described by equation (?)= ax + bx^2. The relationship between number of sterile spikelets per ear (x) and grains per ear (y) could be described by equation (?)= ac^bx.