What reason is the wheat leaf tip yellowing? How to deal with it?

Fertilizer damage: high fertilization concentration of wheat leads to burning leaves and yellowing, so the concentration should be controlled. Drug damage: misuse of herbicides and dichlorvos can lead to yellowing. Element deficiency: lack of trace elements can lead to wheat leaf tip yellowing, need appropriate amount of topdressing. Water deficiency: if drought is caused, it should be watered reasonably. Freezing injury: the temperature difference between day and night will lead to the yellowing of leaf tips. Yellow dwarf virus disease: pay attention to the prevention and control of aphids and choose varieties with good disease resistance. Excessive close planting: photosynthesis will be affected, so close planting should be reasonable.

First, fat damage

When watering and fertilizing at the flowering stage of wheat, some fertilizers will stick to the tip leaves of the seedlings, and the leaf burning will occur because the fertilizer concentration is too high. If the yellowing of wheat tip accords with the distribution law of fertilizer application in the field, and it occurs after fertilization, this situation should be considered.

Solution: therefore, the amount of fertilizer for wheat should be used strictly according to the concentration, and attention should be paid to the variety and timing of fertilization.

II. Drug damage

Because the misuse of herbicides, dichlorvos and other agents will also cause damage to wheat, and this kind of drug damage will cause scorched spots on wheat. In order to prevent herbicide damage to wheat, the use of herbicides should be strictly controlled, and broad-leaved herbicides should not be used in wheat fields.

Solution: once the occurrence of drug damage to wheat, it is very troublesome, there are almost no good remedial measures, generally give priority to prevention.

III. Element deficiency

Wheat lack of copper and other reasons, lead to the lack of trace elements, will make the wheat leaf tip yellow.

Solution: when wheat is watered, appropriate urea can be used for topdressing, and foliar fertilizer and other fertilizers can be used in time to increase wheat nutrition, but it should be fertilized in an appropriate period, and the concentration of fertilizer should be strictly controlled to avoid fertilizer damage.

IV. Water deficiency

Due to less watering or difficult to retain water in the soil, or wheat can not absorb water normally, various droughts will lead to dehydration and dryness at the top of wheat. This phenomenon is often accompanied by leaf curling, lower leaf yellowing and so on.

Solution: planting wheat should be reasonably selected soil conditions and properly watered.

5. Freezing injury

If the varieties of wheat are too sensitive to temperature, coupled with the weather with a large temperature difference between day and night, the sharp leaves may turn yellow. This situation can be judged according to the weather.

Solution: if the freezing injury is not particularly serious, paclobutrazol wettable powder can be sprayed with water. If the wheat has been frozen to death, ploughing should be carried out as soon as possible to replant other crops.

6. Yellow dwarf virus disease

Transmitted by aphids, after wheat is infected with the disease, it begins to yellowed and withered from the leaf tip until the lower leaves turn yellow.

Solutions: 1. Local varieties with good disease resistance and tolerance should be selected, and proper control of aphids should be paid attention to, and seed dressing can be carried out.

2. If it is determined that the yellowing of wheat leaf tip belongs to yellow dwarf virus disease, Wuyisin can be used for control.

3. Weeds should be removed in time, winter wheat can be sowed late, spring wheat should be sowed early, and plastic film mulching can be used for winter wheat.

VII. Excessive close planting

Excessive close planting can affect wheat photosynthesis, and this reason can also lead to yellowing of wheat tip leaves, so wheat planting density should be appropriate.