The irrigated winter wheat area of ​​the North China Plain includes Shandong Province and Tianjin City, Central and Southern Hebei Province, Central and Southern Beijing, Central and Northern Henan Province, Guanzhong Plain of Shaanxi Province and Southern Shanxi Province.
The principle of fertilization applies nitrogen fertilizer according to the growth of seedlings, and appropriately increases the proportion of application in the middle and late stages of jointing; scientifically determines the amount and time of topdressing according to the amount of base (basic) fertilizer application, seedling condition, temperature and soil fertility; Timely topdressing. According to soil moisture and water retention and fertilizer retention capacity, the irrigation amount and time should be reasonably determined to achieve water and fertilizer management integration. Grasp the favorable opportunity for wheat to return to green, and take timely measures to promote the transformation of weak seedlings and increase the rate of ear formation; control the long field to prevent the late fall.
Fertilization recommends that the total number of stems per acre before returning to green is less than 450,000. The three types of wheat fields with lighter leaf color and poor growth should be managed in time for fertilizer and water. 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 in the jointing stage, 5-10 kg of urea was applied per acre with watering.
Before returning to green, the total number of stems per acre is between 450,000 and 600,000. The second-class wheat field with a small population is 10 to 15 kg of urea per acre combined with watering during the wheat-up period.
Before returning to green, the total number of stems per acre is between 600,000 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 the wheat field with a prosperous trend should be repressed during the regreening period, delaying the application of nitrogen fertilizer and reducing the amount of nitrogen fertilizer, controlling the population to grow, preventing lodging and late maturity. . Generally, 8 to 10 kg of urea can be applied per mu in the late stage of jointing.
Wheat that has been damaged by early spring damage should be applied with 5-10 kg of urea immediately and watered to promote early tillering of wheat, increase the rate of tillering and reduce the damage of freezing damage.
If the phosphate fertilizer or the phosphate deficiency field is not applied to the base fertilizer, the diammonium phosphate should be applied. The application of potassium fertilizer or less application is recommended to apply nitrogen and potassium compound fertilizer in the greening or jointing stage, and it is also necessary to combine the root stripping disease prevention and control, one spray and three prevention methods to compensate the phosphorus and potassium fertilizer. Without irrigation or effective precipitation, urea and potassium dihydrogen phosphate can be sprayed on the spring foliage to act as a fertilizer.
It can spray potassium dihydrogen phosphate, boron fertilizer and zinc fertilizer on the foliar surface of wheat to prevent dry hot air and lodging, improve grouting intensity and increase grain weight.
In the wheat field in the sulfur-deficient area, if the base fertilizer is not applied with superphosphate, potassium sulfate or sulfur-based compound fertilizer, the ammonium sulfate should be applied in the first top dressing, and the dosage per mu is about 2 kg.
Many farmers have not smashed the ground after the rotation, resulting in deep sowing of deep seedlings, low tillering, and weak seedlings. It is recommended to apply 10 to 15 kg of urea during the returning period.
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