我们进行了杂草存在天数对大豆生育的影响的试验,结果表明,大豆出苗后约45天内,即出苗至开花期,是影响大豆生育的关键时期,如果这阶段草荒,必造成大豆产量下降,减产幅度与草荒天数有显著关系。 We conducted a trial of the effect of days of weeds on soybean fertility. The results showed that the soybean production was reduced within about 45 days after emergence, that is, the period from emergence to flowering was the key period affecting soybean growth. The rate of decrease was significantly related to the days of grass shortage.