How to deal with herbicide damage in wheat field
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First, the symptoms of phytotoxicity (1) 2,4-D herbicides (2,4-D butyl ester, 2 methyl 4-chlorosodium, etc.) will cause chlorosis leaves when used in excess and low temperature. Yellowing, the new leaves are in the shape of onions, the ears are curled, it is difficult to extract, and the deformed ears appear.
(2) When the dosage of oatmeal is too large before wheat sowing, it will be absorbed by the wheat bud sheath, causing the bud sheath to expand, the sheath headspace, growth stop, and the leaves are dark green and dead after emergence.
(3) Benmalong, chlorpyrifos, simazine, etc. are all herbicides absorbed by the roots. When the dosage is too large or the spraying is uneven, the wheat exhibits a typical "green deficiency" due to inhibition of photosynthesis of wheat, that is, after the roots are absorbed by the wheat, the leaves of the wheat seedlings are green and yellow, which are like spots and fires. The plants are short, grow slowly until they stop, and finally the affected plants are "starved to death" due to lack of nutrients.
(4) The herbicide is applied before and after jointing of the wheat 3 leaf stage. If the period of use is not appropriate, it can lead to the inner edge of the blade, the plant is compact and straight, the leaf is dark green after the greening, the stem is straight and hard, the main stem and the lobes become thin, the ear deformity is twisted and sloping, and the leaf is formed. Onion tube. Excessive use of herbicides during the vigorous growth of wheat occurs when the seedlings are stalked and the plants are tilted or bent. If the wheat ear development develops into the stage of differentiation between the stamen and the stamen, the wheat is not strong and the yield is severely reduced due to severe disturbance and destruction of the development of the florets.
Second, remedies for phytotoxicity (1) to take detoxification measures as soon as possible. When the phytotoxicity has occurred or is about to occur, immediately carry out irrigation and detoxification, drain the toxic irrigation water in the field, continuously flush with fresh water, or combine the drainage with lime to neutralize the acidic herbicide in the field. Drug damage. For the phytotoxicity on the plant, the residual agent on the poisonous plant can be rinsed by spraying or spraying water to reduce the phytotoxicity.
(2) Strengthen field management for the affected wheat fields. Increase the application of tillering fertilizer, promote tillering, increase the rate of ear formation, and reduce the loss of phytotoxicity. In fertilization, attention should be paid to the application of organic fertilizer. The organic matter can adsorb the herbicide, causing the herbicide to lose some of its activity, while also providing nutrients for the crop to resume growth.
(3) Application of plant growth regulators to promote wheat growth. Plant growth regulators can promote the growth of wheat, stimulate the growth and development of wheat, and also help to reduce the phytotoxicity. Commonly used detoxification drugs such as gibberellin, brassinolide, etc., evenly spray wheat seedlings, can stimulate the growth of wheat seedlings and reduce phytotoxicity.