First, waterlogging yellow seedlings.
Low-lying terrain, poor drainage, and high groundwater levels, due to long-term waterlogging, organic matter in the soil decomposes slowly, and nutrients cannot be absorbed by wheat seedlings in a timely manner. At the same time, the roots were affected by waterlogging, poor development, shallow rooting, and poor absorption capacity, which led to the yellowing of wheat seedlings and even the emergence of rot-root dead seedlings.
Shallow trenches should be removed in time. Reduce the groundwater level and apply appropriate amount of compound fertilizer to promote recovery.
Second, pest yellow seedlings.
After the damage caused by wheat bran, if the heart is atrophic and stagnant, the leaves are yellow, and the water loss is withered. Select dichlorvos, trichlorfon, dimethoate, etc. and add 1000 times of vinegar to spray and kill. Adding 2% urea can promote transformation of the wheat seedlings.
Third, disease yellow seedlings.
The wheat seedlings were infected with rust and caused yellowing. They were initially distributed in patches. They should be promptly controlled with medicaments to prevent the spread of spread. 15% triadimefon can be used as a 1000-fold solution and sprayed 2-3 times.
Fourth, nitrogen deficiency yellow seedlings.
The results showed that the wheat seedlings chlorosis and yellow evenly, the tips of the leaves were dry, the old leaves of the lower part were yellow and withered, the dwarf leaves were weak, and the tillers were few. This kind of yellow seedlings are mostly found in plots with poor soil, insufficient base fertilizer, or unsatisfactory topdressing. For yellow seedlings caused by lack of oxygen, timely application of ammonium bicarbonate, urea, human waste and other available nitrogen fertilizer, replenishment promote long.
Fifth, lack of manganese yellow seedlings.
The wheat lacks manganese, and the new leaf veins are chlorotic in strips, turning yellowish green to yellow. Sometimes the leaves are light green, the yellow stripes expand into brown spots, and the tips of the leaves scorch. In this regard, 0.1%-0.3% manganese sulfate solution should be sprayed 2-3 times.
6, potassium deficiency yellow seedlings.
Wheat first begins yellowing from the tip of the old leaf, and then stretches along the leaf veins. The yellowing line and the healthy line are distinct and inlaid. The leaves are yellow and soft, and are often affixed to the ground later. This type of yellow seedlings occurs mostly in sandy areas and is generally characterized by edging and edging.
For potassium deficiency and yellow seedlings, 100 kg of ash per acre can be applied to the foliage, or 10 kg of potash can be traced. Foliar can also be sprayed with 1% potassium chloride solution, or 2%-3% potassium nitrate solution, or 5% ash leaching solution, or 0.3% potassium dihydrogen phosphate solution, and generally sprayed 2-3 times.
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