About "topdressing"
Top dressing is a fertilizer that is applied during crop growth. The application of top dressing as an ancient fertilization technique is described in detail in the book of Pansheng, emphasizing the importance of applying base fertilizer and topdressing on crop growth. Its role is to timely supplement the nutrients needed in the process of crop growth and development, in order to promote crop growth and development, improve crop yield and quality, generally apply quick-acting fertilizer, and good-fertilized farmyard fertilizer can also be used as top dressing.
Effective application method of top dressing
1. Deep application of soil cover 2, application of water combined with watering method 3. Application with water pouring method 4
The best topdressing period for field crops
Under the premise of applying the base fertilizer, proper topdressing is an effective way to further increase the yield, especially in the period when the crop absorbs the most nutrients, which can significantly increase the yield and improve the quality.
Corn under the principle of balanced fertilization, corn Tai bell at jointing stage, the peak of the absorption of nutrients, and can be the first topdressing fertilizer before and after jointing. 10 kg of urea should be applied per acre; 7-10 days before the tassels should be applied, the second fertilizer should be applied, and 20 kg of urea can be applied per acre. If the base fertilizer and the seed fertilizer are sufficient, and the soil is very fertile, one can concentrate the top dressing and combine the second weeding for deep fertilization.
Nitrogen Absorption of Rice is gradually increased from the turning green, tillering achieve peak absorption of fat. In order to promote early rice and early tillering, early application and heavy application of manure should be applied. Generally it can be 7-10 days after transplanting. 10 kg of urea per mu is topdressed, and 15-20 kg of urea is applied after heading.
In order to meet the nutrient needs of sorghum from jointing to heading, sorghum should chase the first fertilizer at the jointing stage, and apply 8-12 kg of urea per acre; chase the second fertilizer in the flagging period of the booting stage, and apply urea to each acre. 10 kg.
Peanut The critical period of nutrition of peanuts is in the early stage of fertility. About 15 days after the emergence of peanuts, the flower buds begin to differentiate and the nodules begin to form. When two pairs of side branches appear in the plant, the nitrogen fertilizer should be applied once in time, and 5-10 kg of urea should be applied per acre. After the peanut is flowered, it is combined with the soil and sprayed with multiple micro-fertilizers, which is beneficial to reduce the empty fruit rate and increase the peanut yield.
Soybean Soybean is a crop that requires more nitrogen, but it has a rhizobial nitrogen fixation that can solve some nitrogen sources. However, during the growth period, the fertilizer should be applied in stages. Usually, the nitrogen fertilizer is applied once in the early flowering stage of soybean, which can reduce the rate of flowering and falling, and can prolong the life of the plant, increase the grain weight and increase the yield. Generally, 8-12 kg of urea can be applied per acre. In the pod-forming stage of soybean, if the multi-micro-fertilizer is sprayed once on the leaf surface, the yield increase effect is more obvious.
Potatoes can generally be topdressed before the flowering stage of the potato. Early-maturing varieties are suitable for topdressing at the seedling stage. The mid-late and late-maturing varieties are better applied before the buds. The application of urea 10 kg per acre and 5-10 kg of potassium sulfate can not only Increase production and improve quality.
In order to meet the nutrient needs of sorghum from jointing to heading, sorghum should chase the first fertilizer at the jointing stage, and apply 8-12 kg of urea per acre; chase the second fertilizer in the flagging period of the booting stage, and apply urea to each acre. 10 kg.
Peanut The critical period of nutrition of peanuts is in the early stage of fertility. About 15 days after the emergence of peanuts, the flower buds begin to differentiate and the nodules begin to form. When two pairs of side branches appear in the plant, the nitrogen fertilizer should be applied once in time, and 5-10 kg of urea should be applied per acre. After the peanut is flowered, it is combined with the soil and sprayed with multiple micro-fertilizers, which is beneficial to reduce the empty fruit rate and increase the peanut yield.
Soybean Soybean is a crop that requires more nitrogen, but it has a rhizobial nitrogen fixation that can solve some nitrogen sources. However, during the growth period, the fertilizer should be applied in stages. Usually, the nitrogen fertilizer is applied once in the early flowering stage of soybean, which can reduce the rate of flowering and falling, and can prolong the life of the plant, increase the grain weight and increase the yield. Generally, 8-12 kg of urea can be applied per acre. In the pod-forming stage of soybean, if the multi-micro-fertilizer is sprayed once on the leaf surface, the yield increase effect is more obvious.
Potatoes can generally be topdressed before the flowering stage of the potato. Early-maturing varieties are suitable for topdressing at the seedling stage. The mid-late and late-maturing varieties are better applied before the buds. The application of urea 10 kg per acre and 5-10 kg of potassium sulfate can not only Increase production and improve quality.
　　　
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