From late December to early January of this year, the tip or whole leaves of some wheat seedlings in rural areas began to chlorosis and yellowing. Some of the yellow areas of wheat seedlings accounted for about 20%, and the wheat seedlings in individual areas were still dead, which made the growth and development of wheat inhibition.
The reason is that first, there is a continuous drought in the place where the seedlings are planted. After the wheat seedlings are released, they encounter continuous rain and rain. The fertilizer is not applied immediately, so that the wheat seedlings can not absorb nutrients and de-fertilize. Second, the herbicides are used to control weeds. The selected herbicide is not right or the application concentration is too large, or repeated spraying, so that the wheat seedlings suffer from phytotoxicity; the third is caused by the wheat spider, which often causes the wheat seedlings to be block or piece damaged, and the yellow leaves are reddish.
In summary, the yellowing of wheat seedlings is mainly caused by the shortage of fertilizer and water, phytotoxics and pests, and poor drainage in the field. In order to promote the transformation of wheat seedlings as soon as possible, it is necessary to immediately apply nitrogen fertilizer, 15 to 20 kg of urea per acre or 40 to 60 kg of ammonium bicarbonate, or to catch 1000 to 1500 kg of water. At the same time, both medicine and fertilizer can alleviate phytotoxicity. An optional plant growth promoter 0.01% of Tianfengsu or Baoji (alkaline lactone); two available 0.05% of "920"; three available "802" 2000 times liquid, different from the actual situation spray 1 ~ 2 The fourth can be sprayed with the active liquid fertilizer Huimanfeng or Zhuangfuxing 2000 times, which can gradually restore the normal growth of the wheat seedlings.
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