The best fertilization period for crops
1. The corn and maize have a long time for sucking fertilizer, and the amount of fertilizer needed is also relatively large. Basing on applying base fertilizer and seed fertilizer, they are often unable to fully meet the needs. Therefore, topdressing is also required. After the jointing of the corn to the big bell-mouth period, it is the peak period of absorbing nutrients. Generally, the first fertilizer can be applied before and after jointing, and 12 kg of ammonium nitrate or 10 kg of urea can be topdressed per mu; 7-10 days before tasselling. The second fertilizer should be applied first, and then 15 kg of ammonium nitrate or 12 kg of urea can be applied to each acre. If the base fertilizer and seed fertilizer are more abundant and the soil is very fertile, you can concentrate on topdressing once, and use the second spade for deep fertilization. 2. The joint growth from sorghum and sorghum to heading stage is the period of vegetative growth and reproductive growth. It is the most prosperous period in the whole growth period. Not only does the stem and leaf grow rapidly, but it also enters the stage of young panicle differentiation, and the absorption nutrients reach the highest peak at this time. It is the maximum period of time needed for fertilizer. In order to meet the sorghum's need for nutrients, the first fertilizer should be applied at the jointing stage, 10 to 15 kg of ammonium nitrate or 8 to 15 kg of urea should be applied per acre, and the second fertilizer should be applied at the booting flag stage. Acres with ammonium nitrate 8 kg or urea 5 kg. 3. The jointing of foxtail millet to the heading stage is a period of vegetative growth and reproductive growth. At this time, it is extremely sensitive to fertilizer requirements. The main direction of field management is to attack the strong strains and attack the flowers. If you apply a fertilizer. After jointing, it can be carried out twice or three times in combination with shoveling, and 15 kg of ammonium nitrate or 12 kg of urea can be applied per mu. Can be divided into two fertilizers, the first in the jointing period, topdressing 10 kg of ammonium nitrate per hectare or 8 kg of urea; the second time in the booting stage followed by 10 kg of ammonium nitrate or 8 kg of urea. This will not only promote the growth of the seedlings at the seedling stage, but also ensure adequate nutrient uptake during late filling. 4. Soybeans Soybeans are crops requiring more N fertilizers, and their rhizobia can only satisfy 1/2-1/3 of the total nitrogen requirement. Therefore, the timely supply of nitrogen fertilizer has a significant effect on soybean production. Usually in the initial flowering stage of soybean, topdressing nitrogen fertilizer is used to reduce the rate of falling flowers and to prolong the life of the plant. Increase grain weight and increase production. Generally, 10-15 kilograms of ammonium nitrate or 8-12 kilograms of urea is applied per acre; during the period of soybean crusting, one extra-root fertilizer can be applied, and the effect of increasing production is more obvious.