In the late growth stage of wheat, the root system enters the senescence stage, the absorption capacity is weakened, the utilization rate of root fertilization is very low, and some nutrients such as phosphorus are often in short supply. At this time, it is necessary to maintain appropriate nitrogen, phosphorus and potassium nutrient levels to extend the functional period of the leaves. Prevent premature aging, enhance photosynthetic products, and increase grain yield and quality. The external top dressing can not only make up for the lack of root absorption capacity, but also spray the fertilizer directly onto the spray surface to be absorbed and utilized, and can prevent the late-ripening of the late-stage nitrogen fertilizer, so as long as it is properly used, it is economical and effective. Significant.
What kind of fertilizer should be applied to the top dressing? It is necessary to "see the sky and look at the looks". According to the specific situation, it is necessary to select the "seeing the sky" according to the weather conditions. It should be carried out when there is no wind on sunny days. The effect is not good, and the spray fertilizer can also be combined with the prevention and treatment of late pests and diseases. “Looking at the ground and looking at the looks†is to determine the type and quantity of fertilizers to be applied based on soil nutrient status, wheat growth and appearance.
From the heading stage to the milky stage, such as yellowing of leaves, de-fertilization and premature aging of wheat fields, the focus should be on spraying nitrogen fertilizer. Spraying 50-60 kg of 1%~2% urea or 2%~4% ammonium sulfate solution per acre, the yield increase effect is very significant. Generally, spraying 1-2 times can increase the yield of wheat by 5%~10%, and the high yield can increase 20 %about.
High-yielding wheat fields without premature aging are generally no longer applied with nitrogen fertilizer; it is possible to greet late-maturing wheat fields and not to apply nitrogen fertilizer. In these two types of wheat fields, a 0.2% to 0.4% potassium dihydrogen phosphate solution or 5% grass ash water should be sprayed at a concentration of 50 to 60 kg per mu, all of which can achieve a certain yield increase effect. According to the test, it is generally possible to increase the weight of one thousand to three grams, increase the yield by more than 5%, and increase the yield by about 15%.
Phosphorus-deficient wheat fields with more nitrogen fertilizer should be sprayed with 2% to 4% of superphosphate solution or 0.2% to 0.3% of potassium dihydrogen phosphate solution of 50-60 kg per mu, which can also promote grain filling. Increase the effect of 1000-grain weight. Medium and low-yield wheat fields can be sprayed with nitrogen and phosphorus, which has a very obvious effect on promoting grain filling and delaying plant senescence.
It is necessary to pay attention to the weather forecast carefully. When there is dry hot air, no matter what kind of wheat field, timely spraying of potassium dihydrogen phosphate or grass gray water, etc., has the effect of preventing dry hot air.
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