drought
Drought-induced yellowing of wheat crops occurred in plots where there was not enough ground plough and robbed sowing. The moisture absorbed by the wheat root system from the soil is difficult to compensate for consumption, and its growth and development are affected, and it is severe when it is dead. The performance of the field was that the whole wheat field was yellowed more uniformly, the tillers were delayed, the growth was slow or stagnant, the new leaves were short and the roots were small and fine.
Straw returned to farmland shallow
At present, the amount of returned straw is generally larger in all parts of the country, and the plough layer is generally less than 20 cm, so that part of the wheat roots in the field are tied up on the loose straw, and it is difficult to absorb nutrients from the soil, resulting in yellow wheat seedlings. Therefore, deep plowing and deep plowing are recommended. Deep plowing should be performed once every 3 years and the depth should reach 25 cm.
Lack of fertilizer
Insufficient nitrogen fertilizer or insufficient phosphate can cause yellow wheat. The lack of nitrogen in yellow wheat is due to the early sowing, inadequate basal fertilizer application or low nitrogen content in the basal fertilizer, which results in the yellowing of the leaves of the wheat seedlings, the weak and weak plants, and the small and weak tillering. Encounter this kind of situation, should pay 5 kilograms of urea per acre in the returning green period, get up or jointing period and then apply 12 to 15 kilograms of urea per acre.
The insufficient amount of phosphorus fertilizer in wheat basal fertilizer or the lack of phosphorus in the soil will also make the wheat yellow. In the field, there are few secondary roots, few tillers, dark green leaves and yellow tips. Phosphorus yellowing in wheat will lead to less spikelets and a decrease in grain weight, seriously affecting yield. When wheat seedlings are deficient in phosphorus, 10 kg of diammonium phosphate or 45-50 kg of superphosphate can be applied per acre.
High density
The sowing of wheat has high density, which causes the wheat population to be too large, which affects the photosynthesis of wheat, resulting in insufficient supply of nutrients and yellowing of the leaves. Freezing damage
Sustained low temperature, less light, wheat as a whole is weak, affected by low temperature damage also showed yellow leaves. The prevention and control measures were to strengthen management and spray foliar fertilizer after the arrival of the cold spell.
Diseases and pests
The main wheat diseases are sheath blight, total erosion and root rot. All of them are fungal diseases. They appear as yellow leaves in the early stages of development. However, the site of lesions and the shape of lesions are different. Rhizoctonia solani mainly damages the leaf sheath, and the full-blown disease mainly affects the stem base and root; root rot only occurs in the root.
Underground pests can also damage yellow wheat. The control method is chemical seed dressing and soil treatment.
Phytotoxicity
Herbicides in crops on crops, such as corn on the top of the crop, have a large amount of atrazine, a corn herbicide, and can cause yellowing of the crop.
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