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Fertilization principle
First of all, according to the growth of seedlings, nitrogen fertilizer should be applied in different stages, and the proportion of application in the middle and late stages of jointing should be appropriately increased; the amount and time of topdressing should be scientifically determined according to the amount of base fertilizer application, seedling condition, temperature and soil fertility; top dressing. At the same time, according to soil moisture and water retention, fertilizer capacity, reasonable determination of irrigation amount and time, to achieve water and fertilizer management integration. In addition, it is necessary to seize the favorable opportunity for wheat to rejuvenate and join the festival, promptly adopt measures to promote and control, promote the transformation of weak seedlings, increase the rate of ear formation, control the long field, and prevent the late fall.
Fertilization advice
Before returning to green, the total number of stems per acre is less than 450,000, and the three types of wheat fields with lighter leaf color and poor growth are timely: fertilizer and water management should be carried out in time, and spring topdressing can be carried out twice. For the first time in the greening period, 5-8 kg of urea was applied per acre with watering; the second time was 5-10 kg of urea per acre with watering during the jointing period. Before returning to green, the total number of stems per acre is between 45,000 and 600,000, and the second group of wheat fields with a small population: in the period of wheat uplift, combined with watering, 10 to 15 kg of urea per mu. Before returning to green, the total number of stems per acre is between 60,000 and 800,000. A suitable group of wheat fields can be combined with watering for 12 to 15 kilograms per acre during jointing. Before returning to green, the total number of stems per acre is more than 800,000, the color of the leaves is dark green, and there is a tendency to grow. The cultivating should be carried out during the regreening period, delaying the application of nitrogen fertilizer and reducing the amount of nitrogen fertilizer, controlling the population, preventing lodging and corruption. Late ripe. Generally, 8 to 10 kg of urea can be applied per mu in the late stage of jointing.
Wheat damaged by early spring: 5-10 kg of urea should be applied immediately and watering should be carried out to promote early tillering of wheat, increase tillering rate and reduce the damage of freezing damage; many farmers do not squat after rotary tillage, resulting in deep sowing of sowing. Weak seedlings, less tillers, and weak seedlings: It is recommended to apply urea 10 to 15 kg during the returning period; wheat fields in the sulfur-deficient area: if the base fertilizer is not applied with superphosphate, potassium sulfate, sulfur-based compound fertilizer, etc., it should be the first When applying the top dressing, choose ammonium sulfate, and the amount of sulfur applied per mu is about 2 kg.
At the same time, it is necessary to apply the diammonium phosphate to the base fertilizer without applying phosphate fertilizer or phosphorus deficiency field; for the field without applying potassium fertilizer or less application, it is recommended to apply nitrogen and potassium compound fertilizer in the regreening or jointing stage, combined with the prevention and control of sheath blight The method of one spray and three preventions is to compensate the phosphorus and potassium fertilizers by root dressing; if there is no irrigation condition or no effective precipitation, the leaves can be sprayed with urea and potassium dihydrogen phosphate in the spring to play the role of fertilizer. In addition, potassium dihydrogen phosphate, boron fertilizer and zinc fertilizer can be sprayed on the foliar surface of wheat during grain filling, preventing dry hot air and lodging, increasing grouting strength and increasing grain weight.
Henan Daily Rural Edition
How to chase the "first fat" of wheat in spring
After the Spring Festival is over, the rainy season has passed, the temperatures in various places have risen, and the wheat greening period has arrived. Farmers who grow wheat should chase water and topdress in time to ensure increased production and income. Let's share the winter wheat topdressing technology with you.
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