(2) Before returning green, the three types of wheat fields with less than 450,000 total stems per acre, lighter leaf color, and poorer growth condition should be subject to timely fertilizer and water management. The spring topdressing can be performed in two separate ways. The first time in the returning green period, with topdressing of 5~8 kg of urea per acre, the second time during the jointing stage, 10~15 kg of urea was topped with water per acre.
(3) Before returning green, the total number of stems per acre is between 450,000 and 600,000. The second type of wheat field with small population is combined with watering of 10~15 kg of urea per acre in the wheat growing season. The wheat fields with weak wheat populations can be top-dressed and watered in the early stages of getting up. The suitable wheat fields should be top-dressed and watered later in the day.
(4) Before turning green, the total number of stems per mu is between 600-800,000. A suitable group of wheat fields can be combined with watering of 12-15 kg of urea per acre during the jointing stage.
(5) Before returning green, the wheat field with more than 800,000 total stems per acre, dark green leaves, and prosperous tendencies should adopt measures such as cultivating and repression to reduce the use of nitrogenous fertilizers, and control groups to prosper, prevent lodging, and become late-maturing. Generally can be applied in the late jointing urea per acre 8 to 10 kg.
(6) Dry-land wheat fields without water-spraying: Combine repression and ploughing, raise lice, and increase the drought resistance of wheat itself. In early spring, the soil is returned to the soil or rainfall, and 5-7 kg of urea is applied per acre with chemical fertilizer or ditching. If the middle and late fertility occurs, the urea will be topped with 5 to 10 kg of urea.
For the application of phosphate fertilizer or phosphate-deficient fertilizer to the base fertilizer, diammonium phosphate should be used. If there is no irrigation condition or there is no effective precipitation, foliar spraying of urea and potassium dihydrogen phosphate may be adopted, which can play the role of fertilizer and water. Can also be covered by the application of organic fertilizers, play a role in insulation, preservation, improve nutrition, promote water and fertilizer coordination. Conditional areas can be increased by applying trace elements such as molybdenum, boron, and zinc fertilizers.
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