摘要
新中国成立以来,浙江省的油菜产量有了较大幅度的提高。产量最高的1979年,其总产量和单位面积产量分别比1951年增长1.78倍和1.2倍。六十年代以来,由于大面积推广甘兰型油菜新品种,增施肥料和改进栽培技术,油菜产量提高到了一个新水平。七十年代的平均亩产为124斤,比六十年代平均亩产84斤,增产47.62%,比五十年代平均亩产68斤,增产82.35%。杭州市郊七十年代平均亩产141斤,比六十年代增产25.89%,比五十年代增产80.77%。但是,年度之间的产量波动仍然很大。
The present paper reports that the relationship between accumulated temperature,precipitation,hours of sunlight and the yield of rapeseed was analysed by multiple regression,resulting in a significantly different F value in precipitation only.For this reason the major climatic factor which affects the yield of rapeseed is the rainfall during the growing season,and the critical periods are the seedling stage pre-winter and the pod developing stage.The correlation coefficient and the linear regression equation among the growing duration,the seedling pre-winter,the pod developing stage and yield of rapeseed can be expressed as follows:r=-0.6097,y=225.1309-0.1426x;r=-0.5355,y=165.4985-0.2008x;r=-0.6602,y=187.3860-0.3623x,The relationship between hours of sunlight and the yield of crop is manifest only at the pod developing stage with a positive correlation of r=0.434,y=53.185+0.5140x.In order to obtain a stable high yield of rapeseeds,it is necessary to select moisture-tolerant varieties,lower the underground water-level and reduce the soil moisture.
作者
余兆海
陈潄芳
Yu Zhao-hai;Chen Shu-fang(Zhejiang Academy of Agricultural Sciences,Hanzhou;Zhejiang Agricultural University,Hanzhou)
出处
《中国农业科学》
1981年第5期64-70,共7页
Scientia Agricultura Sinica
