1, the potato. Generally, the topdressing can be carried out before the flowering period of the potato. The early-maturing varieties are suitable for topdressing at the seedling stage. The mid-late and late-maturing varieties have better top dressing before the bud, and the fertilization of 13-15 kg of ammonium nitrate or 10 kg of urea per mu.
2, corn. After the jointing of the corn to the big trumpet period, it is the peak period of nutrient absorption. The first fertilizer is applied before and after jointing, and 10 kg of ammonium nitrate or 8 kg of urea is applied per mu; 7-10 days before heading, the second 2 times of fertilizer, 15 kg of ammonium nitrate or 12 kg of urea per mu. 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 cultivating and deep fertilization.
3. Rice. The absorption of ammonia fertilizer by rice began to increase gradually after returning to green, and reached the peak of fertilizer absorption at the peak of tillering. In order to promote early rice and early tillering, early application and heavy application of manure should be applied. 7-10 days after transplanting, 1.5 kg of ammonium nitrate should be applied per acre, and 7 kg of urea should be chased when heading.
4, wheat. Wheat topdressing should be carried out at the 3-leaf stage, applying 18 kg of ammonium nitrate or 9-12 kg of urea per acre. The ability of roots to absorb fertility from the soil in the late stage of wheat is weakened. Therefore, it should be topdressed once in the heading and flowering stage. 150 g of potassium dihydrogen phosphate can be used per acre, 1.5 mg of triacontanol solution can be mixed with 20 kg of water. Solution spray; can also use 200 grams of potassium dihydrogen phosphate per acre, add 1 kg of urea, spray 30 kg of water.
5, flue-cured tobacco. Generally, all farmyard manure, phosphorus and potassium fees and about 60% of nitrogen fertilizer are applied at once. About 40% of the nitrogen fertilizer is used for topdressing. The sapling period is the best fertilization period, and should not be later than 30 days after planting. According to the situation of thin soil and fat, the topdressing can also be carried out in two times (again to chase the top fertilizer). Tobacco fertilization is commonly used in caves, ditching and applying water. Whether it is dispersed or concentrated application, the depth of fertilization should be within 5-20 cm soil layer. Too deep and too shallow is not conducive to the root absorption of tobacco plants.
6, soybeans. Soybean is a crop that requires more nitrogen fertilizer. It can reduce the fruit drop rate, prolong the plant life, increase the 1000-grain weight and increase the yield. It usually applies 10-15 kg of ammonium nitrate or 8-12 kg of urea per mu. In the pod-forming period, the top dressing can be applied once more, and the effect of increasing yield is more obvious.
7, rape. The rapeseed top dressing is generally carried out in the field seedling stage and the early stage of the bud. Generally, in the second half of December, the urea (7.5 mg) of urea was applied (later fertilizer). After the bud of the next year in late February, 10 kg of urea was applied. In the Guanzhong planting area of ​​Shaanxi, the bud fertilizer is required to be early and heavy. In the Ankang and Hanzhong planting areas, it is necessary to re-apply the wax fertilizer and chase the bud fertilizer as early as possible.
ã€Comment】 ã€Print this article】 ã€Close this page】 ã€Large, medium and small】
Ring Neodymium Magnet
Rare Earth Magnet,Very Strong Magnet,Ring Magnet
East Magnet Co., Ltd. , http://www.nbferritemagnet.com