在谈到蚕豆的栽培技术时,常有人提出花期打顶的措施。蚕豆打顶确有提早成熟2—3天和增强抗倒能力的作用,但也存在打顶减产的问题,打顶越早,减产越多。我所在1976、1978和1980三年曾进行了蚕豆打顶试验,结果打顶后减产幅度为1.6—34.6％,平均为16.9(见表1)。 蚕豆打顶为什么会减产呢?这是因为蚕 When it comes to the cultivation techniques of broad beans, it is often suggested that the flowering should be topped. Broad beans do indeed play 2-3 days to mature early and enhance the role of lodging resistance, but there is also the problem of top to reduce production, hit the sooner, the more production. In my three years of 1976, 1978 and 1980, a broad bean topping test was conducted. The results showed that after the top-hatching, the yield reduction was 1.6-34.6% with an average of 16.9 (Table 1). Why is the production of broad bean topping? This is because silkworms