How to apply fertilizer outside wheat roots
In the later stage of wheat growth, the root system enters the senescence stage, the absorption capacity is weakened, and the utilization rate of root fertilization is very low. At the same time, some nutrients such as phosphorus are often in short supply. At this time, it is necessary to maintain appropriate levels of nitrogen, phosphorus, and potassium to prolong the functional period of the leaves, prevent premature senescence, enhance photosynthetic products, and improve grain yield and quality. Extra-root fertilizer can not only make up for the weakened absorption capacity of the root system, but also prevent the late maturity caused by excessive nitrogen fertilizer application in the later period. As long as it is used properly, it is both economical and effective.
The fertilizer that should be applied after top-root fertilization should be "looked at the sky, the ground, and the appearance", which is determined according to the specific situation. "Look at the sky" is to top dress according to the weather. It should be carried out when there is no wind on sunny days, and the effect of spraying on rainy days is not good. Spraying fertilizer can also be combined with the prevention of diseases and insect pests in the later stage. "Look at the ground and look at the appearance" is to determine the type and quantity of topdressing fertilizer according to the soil nutrition status, wheat growth and appearance.
From the heading stage to the milk maturity stage, such as yellowing of the leaf color, defertilization and premature aging wheat fields, nitrogen fertilizer should be sprayed. Spray 50 ~ 60 kg of 1% ~ 2% urea or 2% ~ 4% ammonium sulfate solution per mu, and the effect of increasing production is very significant. Generally, spraying 1 to 2 times can increase wheat yield by 5% to 10%, and high ones can increase yield by about 20%.
High-yield wheat fields without premature aging generally don't apply nitrogen fertilizers; it is possible to cope with late-maturing wheat fields and do not apply nitrogen fertilizers. These two types of wheat fields should be sprayed with 0.2% ~ 0.4% concentration of potassium dihydrogen phosphate solution or 5% grass and gray water, 50 ~ 60 kg per mu, and both can achieve a certain yield increase. According to the test, it can generally increase the weight of 1 to 3 grams, increase the yield by more than 5%, and increase the yield by up to 15%.
For phosphorus-deficient wheat fields with more nitrogen fertilizers, focus on spraying 2% ~ 4% superphosphate solution, or 0.2% ~ 0.3% potassium dihydrogen phosphate solution, 50-60 kg per mu, to promote grain filling and increase 1000-grain weight Effect. The low-yield wheat field can be sprayed with nitrogen and phosphorus, which has a very obvious effect on promoting grain filling and delaying plant senescence.
Pay attention to the weather forecast. When there is dry and hot wind, no matter what kind of wheat field, it is necessary to spray potassium dihydrogen phosphate or grass and gray water in time, which has the function of preventing dry and hot wind.
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