油菜是我县的一种主要油料作物,种植面积达3万亩以上。在生产实践中往往有部分油菜由于密度过大和施肥不足,而生育不良,产量不高。为了探讨油菜的适宜种植密度,摸清其各个时期的需肥特性,从而给大田生产制订栽培措施提供可靠的科学依据,1964—1965年我们在官桥公社牛车下大队于一般栽培条件下进行了这一试验。供试品种为武油1号。试验地土壤为黄粘土,肥力较低。前作为中稻华中1号。试验处理:密度,行距1尺,穴距8寸,每亩7500穴,在相同的穴数下,分每穴1苗、2苗、3苗、4苗及5苗五个处理;每种密 Rape is a major oil crop in our county, with an acreage of over 30,000 mu. In practice, there are often some rapeseed due to over-density and insufficient fertilization, and poor fertility, yield is not high. In order to explore the suitable planting density of rapeseed, find out the need of fertilizer in each period, so as to provide a reliable scientific basis for the field cultivation and cultivation measures. From 1964 to 1965, we carried out under the general cultivation conditions This experiment. Test varieties for the Wuyou 1. The test soil is yellow clay with low fertility. Before as the middle of the Huazhong 1. Test treatment: density, spacing 1 foot, hole distance 8 inches, 7500 acre per acre, under the same number of points, points per hole 1, 2, 3, 4 and 5 seedling five treatments;