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油菜是广汉县主要油料作物,亦是大综经济作物,用途广、效益高。我县油菜年播面积在20万亩以上,约占小春播种面积的50—55％。近几年,全县平均单产达到165公斤以上,1987年达到170公斤。单产增加的主要原因,是我们根据川西平原气候变化特点,和作物生长发育规律,正确地推行了适合我县油菜生长发育的发苗类型(即发型),做到目标管理的结果。一、油菜“发型”及相应的栽培技术
Rape is Guanghan main oil crops, is also a large integrated cash crops, wide use, high efficiency. The annual area of rapeseed in my county is more than 200,000 mu, accounting for 50-55% of the area sown by Xiaochun. In recent years, the county average yield reached 165 kilograms or more, in 1987 reached 170 kilograms. The main reason for the increase in yield is that according to the characteristics of climate change and the crop growth and development in the western Sichuan Plain, we correctly implemented the seedling type (ie hair style) suitable for the growth and development of rape in our county and achieved the result of target management. First, the rape “hairstyle” and the corresponding cultivation techniques