杂交稻威优35、威优64的高产结构

本文采用相关、多元回归及通径分析方法,分析1984年福建16个县杂交早稻威优35、威优64在120块高产田的产量结构诸因素之间的关系,以找出栽培的主攻目标。1985年又进行验证试验。结果如下: 1、威优35、威优64都表现总粒数对产量的直接作用或净作用最大,结实率次之。说明要获得高产,增加总粒数是关键。 2、通径分析表明,威优64以增加有效穗数来提高总粒数的直接作用大,威优35则以增加每穗粒数来提高总粒数的作用大。即威优64在保持一定穗粒数的基础上以增加有效穗数来达到增产,威优35则以保穗数攻大穗来获得高产。 3、威优35的总粒数与结实率的矛盾尖锐。分析结果表明,每公顷355.05万穗,每穗177.9粒可以协调高产,发挥增产潜力。

YIELD-FORMING COMPONENTS OF HIGH-YIELD EARLY HYBRID-RICE WEIYOU 35 AND WEIYOU 64

The correlated response of yields and yield components through correlation and path coefficient analasis in 120 plots of the first cropping hybrid-rice of "Weiyou 35" and "Weiyou 64" at 16 counties in Fujian Province were performed in 1984. The work was repeated once more in 1985. All results were summarized in the following: 1. For both hybrid-rice "Weiyou 35" and "Weiyou 64" grown as the first crop under the mulitiple crop system showed that the direct effect and net effect between the yield and the sum total of grains were maximum, and the percentage of ripen grains was inferior 2. Path coefficient analysis revealed that the sum total of grains of "Weiyou 64" relier on the number of available panicles multiplied by the basic numbers of grains per panicle, while those of "Weiyou 35" appeared vice versa. The sum total of grains relies on the number of grains per panicle multiplied by the basic numbers of available panicles. 3. 355.05 thousand of available panicles per ha and 177.9 grains per panicle may provide a sufficient numbers for screening a high-yield variety in "Weiyou 35". In order to obtain the above good yield data, topdressing after the heading stage is considered as a key link in the cultural techique.