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禾大壮除稗效果在1个月内可达100％,3叶以下稗草3天内即可死亡,3叶以上稗草3天后叶片呈葱管状,整株呈鸡爪状,植株萎缩,陆续死亡。可见,禾大壮是水稻秧田目前较理想的除草剂之一。但在使用过程中,由于应用技术不当及外界条件的影响,禾大壮也会造成水稻秧苗的药害。 (一) 气候因素与药害的关系: 1.4月上旬至5月上旬,当气温稳定在12～15℃,阴雨天数多,日照不足的情况下,使用禾大壮后1星期左右,水稻秧苗幼嫩叶首先出现褐色斑点,然后所有叶片均出现斑点。天
In addition to the effect of barnyardgrass barnyardgrass up to 100% within 1 month, less than 3 leaves of barnyardgrass can die within 3 days, 3 leaves of barnyardgrass more than 3 days onion was tubular, the whole plant was chicken-like, plant shrinkage, one after another death. Can be seen Wo Da Zhuang rice seedling is now one of the more ideal herbicides. However, in the process of using, due to the improper application of technology and the influence of external conditions, Wo Dazhuang can also cause the phytotoxicity of rice seedlings. (A) the relationship between climatic factors and phytotoxicity: 1. From early April to early May, when the temperature is stable at 12 ~ 15 ℃, cloudy and rainy days, lack of sunshine, the use of Wo Dazhuang about 1 week later, young rice seedlings Young leaves first appear brown spots, and then all the leaves are spots. day