Symptoms of nitrogen deficiency in wheat and control methods: For wheat planting, it is necessary to guard against nitrogen deficiency. Wheat nitrogen deficiency can lead to slow plant growth, individual dwarf, and reduced tillering; leaf color is faded, old leaves are yellow, premature fading is dry; Often reddish or purplish red; the roots are slender, the total amount of roots is reduced; the differentiation of young ears is incomplete and the shape of the ears is small.
Sandy, organically poor soils, without the application of base fertilizer or a large amount of organic fertilizer with high carbon to nitrogen ratio, are prone to nitrogen deficiency. The diagnostic index for soil available nitrogen (in N) from tillering to jointing is: less than 20 mg/kg. The control measures for the lack of wheat nitrogen deficiency are mainly to fertilize soil fertility and improve soil nitrogen supply capacity; When the organic fertilizer with high nitrogen ratio is straw, attention should be paid to the application of quick-acting nitrogen fertilizer; when ploughing the soil, a certain amount of quick-acting nitrogen fertilizer should be applied as the base fertilizer; for the nitrogen deficiency caused by uneven ground force, the quick-acting nitrogen fertilizer should be applied in time.
The prevention and control measures of nitrogen excess in wheat are mainly based on the nitrogen requirement of different growth stages of crops and the characteristics of nitrogen supply in soil. The nitrogen fertilizer should be applied in a timely and appropriate amount, and the dosage should be strictly controlled to avoid the late application of nitrogen fertilizer. Under the premise of reasonable rotation, Based on the rotation system, determine the appropriate nitrogen application rate; rationally apply phosphorus and potassium fertilizer to maintain the balance of nitrogen, phosphorus and potassium in the plant.
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