影响油菜产量主导因子的研究

据1980～1992年多个新品种（系）13年定位资料，从垂直面上，采用逐步回归分析得到：影响早、中熟两大类型油菜经济产量的主导因子都是菌核病。成熟期病株率（X4）与产量（Y）的最优回归方程为；Y早=166．4061－1．1504X4Y中=163．506－1．3345X4两类型油菜多年平均籽粒产量相差3．73公斤（t＝1．98，P＞0．05），日产量0．005公斤／亩·日（t＝0．57，P＞0．05），差异不显著。中熟型菌核病株率比早熟型轻7．58个百分点，但早熟型生育期短8．45天。文中对各经济性状进行了比较。为此，建议生产上注意适当扩大早熟类型的比例，同时指出采用简易有效的控制菌核病的新途径的紧迫性。

STUDY ON THE LEADING FACTOR AFFECTING THE YIELD OF RAPE

The experiment was conducted with the gradual regression analysis to study the many new varieties (lines)about thirteen years' location test dates. The result indicated that the major factor affecting the economic yields in two magor type Rape is sclerotinia rot of rape. During mature period the optimum regression equation between the disease plant rate (x4) and yield (y) is:y = 166.4061 - 1.504x4 (y: yield of early seasonal rape.Y = 163.506 - 1.3345x4(yM: yield of Middle scasonal recpd)Between the two type rape, the mean kernel yield differ 3.73kg for many years. (t = 1.88, p>0.05), but daily output 0.005kg per day (t = 0.57, p>0.06), haying no significant difference. The selerotinia rot deasease plant rate of Middle seasonal rape is less than that of Early seasonal rape at 7.58 percent, But Early seasonal rape is shorter in grow time than that of Middle seasonal rape about 8,45 days.The comparative research among the economical characters was done.It is suggested that the proportion of Early seasonal rape in agrouomic pract ise should be enlarged, and the necessity of controling the sclerotinia rot of rape trough the effective.Economical and feasible method are put forward.