Remedy for yellowing and wilting of wheat leaves
Wheat is a common food crop and an important food crop in China. The planting area is relatively wide. In the process of planting wheat, some pesticides will inevitably be used. One of them, the improper use of isoproturon, will cause yellowing and wilting of wheat leaves. How should this be remedied?
Isoproturon will reduce the anti-freezing ability of the wheat seedlings. After the application, the wheat seedlings will be vulnerable to freezing damage in the case of severe frost, that is, the "frozen phytotoxicity" will occur. After the occurrence of frost damage, when the wheat seedlings are tenderer green or the damage is heavier, the frostbite is firstly exposed to boiling water and scalded water stains. After the water loss is dry and whitish; when the wheat seedlings are younger or less damaged, the yellowing symptoms of the leaves occur.
If the wheat seedlings of the above-mentioned fields have symptoms such as yellowing of the leaves, they are caused by the "frozen poisoning" of the isoproterenol. When the wheat seedlings are lightly damaged, they can be recovered; the wheat seedlings are seriously damaged, especially when the seedlings are small, and the dead seedlings may occur. After the frostbite of wheat leaves, the leaves lose water quickly. If the soil is dry, it is prone to dry freezing and the dead seedlings are more serious. If the soil is too dry, especially the seedlings, it should be properly watered or watered after the freezing damage (the wheat leaves or the soil can not be watered or watered when it is frozen), or covered with straw and other insulation, which is conducive to seedling protection.
At the same time, according to the damage of the field wheat seedlings, etc., measures such as applying fertilizers. If the wheat seedlings are not too heavy, special management measures may not be taken; if the frost damage or even the dead seedling rate is high, the appropriate fertilizer supplementation according to the previous fertilizer application promotes wheat seedling tillering and group recovery, and if necessary, spray humate leaves. Facial fertilizers and other places that promote the recovery of wheat seedlings and lack of seedlings can be used to remove wheat seedlings from the seedlings before and after the 5th leaf stage of wheat.
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