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 prolong the functional period of the leaves, prevent premature aging, enhance photosynthesis, and improve 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 leaf 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 depends on the circumstances, and depends on the specific circumstances. Look at the sky is to follow the weather conditions, should be selected in the sunny days without wind, rainy days spray effect is not good, spray fertilizer can also be combined with the later pests and diseases control; see the ground, look at the appearance is based on soil nutrient status, The growth and appearance of wheat determine the type and quantity of fertilizer applied.
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 be increased. About 20%.
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%--0.4% potassium dihydrogen phosphate solution or 5% grass ash water should be sprayed at a concentration of 50-60 kg per acre to obtain a certain yield increase effect. According to the test, it is generally possible to increase the weight of 1000-grain to 1-3 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%-4% calcium superphosphate solution or 0.2%-0.3% potassium dihydrogen phosphate solution 50-60 kg per mu, which can also promote the improvement of grain filling. The effect of 1000-grain weight. Medium and low-yield wheat fields can be sprayed with nitrogen and phosphorus, which has obvious effects on promoting grain filling and delaying plant senescence.
It is necessary to pay careful attention to the weather forecast. 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.
What kind of fertilizer should be applied to the top dressing, it depends on the circumstances, and depends on the specific circumstances. Look at the sky is to follow the weather conditions, should be selected in the sunny days without wind, rainy days spray effect is not good, spray fertilizer can also be combined with the later pests and diseases control; see the ground, look at the appearance is based on soil nutrient status, The growth and appearance of wheat determine the type and quantity of fertilizer applied.
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 be increased. About 20%.
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%--0.4% potassium dihydrogen phosphate solution or 5% grass ash water should be sprayed at a concentration of 50-60 kg per acre to obtain a certain yield increase effect. According to the test, it is generally possible to increase the weight of 1000-grain to 1-3 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%-4% calcium superphosphate solution or 0.2%-0.3% potassium dihydrogen phosphate solution 50-60 kg per mu, which can also promote the improvement of grain filling. The effect of 1000-grain weight. Medium and low-yield wheat fields can be sprayed with nitrogen and phosphorus, which has obvious effects on promoting grain filling and delaying plant senescence.
It is necessary to pay careful attention to the weather forecast. 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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