摘要
品种优劣是由多种因素决定的，丰产性是其中的主要因素。因此，研究品种性状相关性及其对产量的作用是栽培和育种的重要内容。本课题选取江浙两省８０年代育成在苏州地区推广的单季晚粳（糯）品种为材料，以６０年代末育成，７０年代苏州地区推广的苏粳２号为对照，研究了生物学产量与株高和经济系数的关系，以及性状相关性对经济产量的作用。结果表明，要实现产量突破，在每平方米３６０穗左右、经济系数达０．４９后，适当增加株高，提高生物产量，力争粒多、粒重，比增加穗数、提高经济系数具有更大的希望。
varieties of late single-crop round-shaped(glutinous)paddy bred and selected in 1981-1985 were used in our experiment disposed in an experimental farm for studying the effect of biological yield on economic yield. The contrast variety was bred and selected in 1968. The area of experiment plot was 13. 33m2. There were 3 repetitions. Seeds were sown on 15 May and paddy shoots were transplanted on 16 June. The plants ripened on 24-29 October. Every hill contained 3-4 paddy shoots,the hill spacing was 13. 33cm×20cm. The fertilizations and managements were the same as in others paddy fields. While paddies ripened six hills were,sampled in every plot for measuring biological yield and economic yield. The path analysis of varietal characters indicated that the path coefficient of biological yield was highest,its net effect was yet highest. The biometrical analyses showed that in case of economic coefficients exceeding 0. 49,the paddy yields were high or low correspondingly to the high or low biological yields instead of to the economic coefficient. The more biological yields are high,the more economic yields are high; the more biological yields are low,the more economic yields are low. The,regression equation is Y=-0.7274+0.5215X Thereby we suggest that enhancing biological yields by suitably increasing plant height is an effective path to improve paddy yields.
出处
《上海农业学报》
CSCD
1994年第3期22-27,共6页
Acta Agriculturae Shanghai
关键词
晚粳
粳稻
生物学产量
经济产量
Late single-crop round-shaped (glutinous)paddy
Biological yield
Economic yield
Economic coefficient
New multiple range test
Regression equation
Path coefficient
