Optimal fertilization period for several crops

The main role of top dressing is to use fertilizer to regulate the growth of crops, to meet the nutritional needs of crops in the middle and late stages of growth, to promote better growth and development of plants, to enhance their resistance to the goal of increasing yield. One of the key problems of top dressing is to grasp the critical period and maximum efficiency period of nutrient absorption of various crops, and to carry out scientific topdressing at the peak of nutrition as much as possible, so as to improve the utilization rate of fertilizer and give full play to its effect of increasing production.

Corn corn

The time for composting is longer, and the amount of fertilizer required is also larger. The application of base fertilizer and seed fertilizer alone cannot often fully meet the needs. Therefore, it is necessary to carry out top dressing. After the jointing to the big trumpet period, the corn is the peak period of nutrient absorption. Generally, the first fertilizer can be applied before and after jointing, and 12 kg of ammonium nitrate or 10 kg of urea can be applied per acre; 7-10 days before the tasseling The second fertilizer should be applied, and 15 kg of ammonium nitrate or 12 kg of urea can be applied per acre. If the base fertilizer and seed fertilizer are sufficient and the soil is very fertile, one can concentrate the top dressing and combine the second shovel for deep fertilization.

2. Sorghum sorghum jointing to heading stage is the period of vegetative growth and reproductive growth. It is the most vigorous growth period in the whole growth period. Not only the stems and leaves grow rapidly, but also enter the stage of young spike differentiation. At this time, the absorbed nutrients reach the highest peak. It is the most period of time when fertilizer is needed. In order to meet the needs of sorghum for nutrients, the first fertilizer should be applied at the jointing stage, and 10-15 kg of ammonium nitrate or 8-15 kg of urea should be applied per mu. The second fertilizer should be re-applied during the flag-raising period. Topdressing ammonium nitrate 8 cm or urea 5 kg.

3. Millet millet millet to heading stage is a period of vegetative growth and reproductive growth. At this time, the fertilizer requirements are extremely sensitive. The main direction of field management is to attack and strengthen the plants and increase the flowers. If you apply a fat once. After the jointing, it can be carried out two or three times in combination with the shovel, and 15 kg of ammonium nitrate or 12 kg of urea can be applied per mu. It can be divided into two top dressings. For the first time in the jointing stage, 10 kg of ammonium nitrate or 8 kg of urea is applied per hectare. The second time is to apply 10 kg of ammonium nitrate or 8 kg of urea at the booting stage. This can not only promote the seedling growth of the plant, but also ensure sufficient nutrient absorption during the later filling.

4. Soybean is a crop that requires more nitrogen fertilizer, and its nitrogen fixation can only satisfy 1/2-1/3 of the total nitrogen requirement. Therefore, timely replenishment of nitrogen fertilizer has a significant effect on soybean yield increase. Nitrogen fertilizer is usually applied once during the initial flowering stage of soybeans to reduce the rate of falling flowers and pods, and to lengthen the lifespan of plants. Increase grain weight and increase yield. Generally, 10-15 kg of ammonium nitrate or 8-12 kg of urea are applied per mu. In the period of soybean pod formation, a top dressing can be carried out, and the effect of increasing yield is more obvious.

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