Why is topdressing generally scheduled for summer?
It is hot and rainy in summer, which is conducive to the growth of various crops. And the sun is abundant, which is beneficial to the photosynthesis of the leaves. Carbohydrates produced by crop photosynthesis require large amounts of nitrogen to form amino acids, proteins and nucleic acids. For food crops such as wheat, corn and rice, summer is a vigorous growing season in which crop vegetative growth and reproductive growth alternate. The rapid growth stage of crops requires a large amount of nutrients, especially nitrogen and potassium, and therefore requires top dressing. This is determined by crop nutrition and climate characteristics.
What fertilizers are mainly pursued in summer?
Field crops are mainly applied to nitrogen fertilizer, and economic crops such as vegetables, tobacco, grapes, cotton, etc., in addition to nitrogen fertilizers, should be applied to potash fertilizer. For example, spring corn crops are treated with urea one-time base fertilizer as a reference, and the other half of the urea is used as a top dressing, which is applied at the end of July and early August. The latter's nitrogen fertilizer utilization rate can be increased by 10-20%. This indicates that the utilization rate of nitrogen fertilizer application is significantly higher than that of all nitrogen fertilizers. Regarding the method of applying nitrogen and potassium fertilizer in summer, it is necessary to ditch the soil to avoid the loss of nitrogen volatilization caused by nitrogen application and the potassium fixation caused by the alternating dry and wet of potassium fertilizer on the surface.
With nitrogen fertilizer as top dressing, the utilization rate of nitrogen fertilizer is obviously improved. Is it related to the nature of nitrogen fertilizer?
Yes. At present, the existing nitrogen fertilizer varieties are all water-soluble. If the nitrogen fertilizer in the whole growth period is applied as a base fertilizer one time before sowing, the nitrogen fertilizer stays in the soil for a long time, while the early growth of the crop is slow and the absorption is small, which is easy to cause. Loss of nitrogen fertilizer. When the hot and rainy season comes, the crop enters the rapid growth stage and needs a lot of nutrients. At this time, the nitrogen fertilizer that has been applied to the soil has already been lost, and some of the nutrient supply has been insufficient, which will cause the phenomenon of post-fertilization and de-fertilization of the crops and reduce the yield.
Is the efficiency of topdressing in summer high or not related to the nutritional characteristics of crops?
It is very important that the demand for nutrition during the growing period of the crop has a phased characteristic. The seedling stage is the critical period of nutrition, and the nutrient content required is not much, but it is very important, usually through the supply of seed fertilizer. Summer is the rapid growth period of crops, and it is also the maximum efficiency period of crop nutrition. At this time, topdressing, crops have high absorption and utilization efficiency of nutrients, so the fertilizer utilization rate is also significantly improved.
However, it should be noted that both nitrogen and potassium fertilizers should be covered to avoid nitrogen loss during hot and rainy seasons.
From: Shanxi Farmers Daily
It is hot and rainy in summer, which is conducive to the growth of various crops. And the sun is abundant, which is beneficial to the photosynthesis of the leaves. Carbohydrates produced by crop photosynthesis require large amounts of nitrogen to form amino acids, proteins and nucleic acids. For food crops such as wheat, corn and rice, summer is a vigorous growing season in which crop vegetative growth and reproductive growth alternate. The rapid growth stage of crops requires a large amount of nutrients, especially nitrogen and potassium, and therefore requires top dressing. This is determined by crop nutrition and climate characteristics.
What fertilizers are mainly pursued in summer?
Field crops are mainly applied to nitrogen fertilizer, and economic crops such as vegetables, tobacco, grapes, cotton, etc., in addition to nitrogen fertilizers, should be applied to potash fertilizer. For example, spring corn crops are treated with urea one-time base fertilizer as a reference, and the other half of the urea is used as a top dressing, which is applied at the end of July and early August. The latter's nitrogen fertilizer utilization rate can be increased by 10-20%. This indicates that the utilization rate of nitrogen fertilizer application is significantly higher than that of all nitrogen fertilizers. Regarding the method of applying nitrogen and potassium fertilizer in summer, it is necessary to ditch the soil to avoid the loss of nitrogen volatilization caused by nitrogen application and the potassium fixation caused by the alternating dry and wet of potassium fertilizer on the surface.
With nitrogen fertilizer as top dressing, the utilization rate of nitrogen fertilizer is obviously improved. Is it related to the nature of nitrogen fertilizer?
Yes. At present, the existing nitrogen fertilizer varieties are all water-soluble. If the nitrogen fertilizer in the whole growth period is applied as a base fertilizer one time before sowing, the nitrogen fertilizer stays in the soil for a long time, while the early growth of the crop is slow and the absorption is small, which is easy to cause. Loss of nitrogen fertilizer. When the hot and rainy season comes, the crop enters the rapid growth stage and needs a lot of nutrients. At this time, the nitrogen fertilizer that has been applied to the soil has already been lost, and some of the nutrient supply has been insufficient, which will cause the phenomenon of post-fertilization and de-fertilization of the crops and reduce the yield.
Is the efficiency of topdressing in summer high or not related to the nutritional characteristics of crops?
It is very important that the demand for nutrition during the growing period of the crop has a phased characteristic. The seedling stage is the critical period of nutrition, and the nutrient content required is not much, but it is very important, usually through the supply of seed fertilizer. Summer is the rapid growth period of crops, and it is also the maximum efficiency period of crop nutrition. At this time, topdressing, crops have high absorption and utilization efficiency of nutrients, so the fertilizer utilization rate is also significantly improved.
However, it should be noted that both nitrogen and potassium fertilizers should be covered to avoid nitrogen loss during hot and rainy seasons.
From: Shanxi Farmers Daily
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