油菜是本县主要经济作物,种植面积稳定在30万亩左右,约占耕地面积的40％,科学施肥,是发展油菜生产的关键措施之一。1981～1988年,我们在多个点上进行了氮、磷、钾化学肥料的适宜用量与配比试验,结果汇总如下。 一、氮素化肥的肥效与适宜用量 根据大量试验,本县油菜地力产量占总产量的46.8％,变幅在39.3～54％之间(n=12),其氮素化肥的依存率为53.2％,大大高于水稻,这充分说明油菜施用氮素化肥 Rape is the main cash crop in this county. The planting area is stable at about 300,000 mu, accounting for about 40% of the cultivated area. Scientific fertilization is one of the key measures to develop rapeseed production. From 1981 to 1988, we conducted a number of points on the appropriate amount of nitrogen, phosphorus and potassium chemical fertilizers and the ratio test, the results are summarized below. Fertilizer efficiency and appropriate amount of nitrogenous fertilizer According to a large number of experiments, the yield of this province’s canola accounted for 46.8% of the total output, ranging from 39.3% to 54% (n = 12), and its nitrogenous fertilizer dependence rate was 53.2 %, Much higher than that of rice, which fully shows that nitrogen fertilizer is applied to rapeseed