1. Potato. Generally, topdressing can be carried out before the flowering period of the potato, while the early-maturing variety is suitable for top dressing at the seedling stage, and the middle-late-maturing variety has better top dressing before budding, and 13 to 15 kg of ammonium nitrate or 10 kg of urea can be topdressed per mu.
2, corn. After the jointing of corn to the big bell-mouth period, it is the peak period of absorbing nutrients. After the jointing stage, the first fertilizer is applied, and 10 kg of ammonium nitrate or 8 kg of urea is applied per mu; within 7-10 days before heading, the topdressing is applied. 2 times fertilizer, topdressing 15 kg of ammonium nitrate or 12 kg of urea per acre. If the base fertilizer and seed fertilizer are more abundant and the soil is very fertile, one can top-dressing and combine the second cultivating with deep fertilization.
3, rice. The uptake of ammonia fertilizer by rice began to increase gradually after returning green, and reached the highest peak of fertilizer absorption during the peak period of tillering. In order to promote the early emergence of rice, early delivery, early application and re-appropriate sub-fertilizer. In the 7-10 days after transplanting, 1.5 kg of ammonium nitrate can be applied per acre, and 7 kg of urea can be recovered when heading.
4, wheat. The topdressing of wheat should be at the 3-leaf stage, top-dressing 18 kg of ammonium nitrate or 9-12 kg of urea per acre. The ability of the root system to absorb fertility from the soil in the later period of wheat is weakened, so it is recommended to top-coat the roots once during the heading and flowering period. 150 grams of potassium dihydrogen phosphate per hectare may be used, and 30 milligrams of triacontanol stock solution may be formulated into 20 kg of water. Solution spray; can also be 200 grams of potassium dihydrogen phosphate per acre, plus 1 kg of urea, 30 kg of water spray.
5, flue-cured tobacco. Generally, all the farmyard manure, phosphorus and potassium charges and about 60% of nitrogen fertilizer are applied once. About 40% of the nitrogen fertilizer is applied topdressing. The regimental period is the best fertilization period and should not be later than 30 days after planting. According to the situation of thin soil fertilization, the topdressing can also be carried out in 2 separate stages (to recover the top fertilizer). Commonly used points for tobacco fertilization, ditching and watering. Regardless of whether it is dispersed or concentrated, the depth of fertilization should be within 5-20 cm of soil layer. Too deep or too shallow is not conducive to the absorption of tobacco roots.
6, soy. Soybean is a crop that requires more nitrogen fertilizer. Applying nitrogen fertilizer once at the beginning of flowering stage can reduce the rate of flowering and fruit drop, prolong plant life, increase grain weight and increase yield. Generally, 10-15 kg of ammonium nitrate or 8-12 kg of urea can be used per acre. During the clams stage, topdressing can be performed once, and the effect of increasing yield is more obvious.
7, rape. Rapeseed topdressing is generally conducted at the Daejeon seedling stage and the bud stage. Generally in the late December, topdressing (fertilizer) urea 7.5 kilograms, the next year in late February returning green bud after topdressing 10 kilograms of urea. The Guanzhong planting area in Shaanxi Province requires that the bud fertilizer be early and heavy, and the Ankang and Hanzhong plantations should be re-applied with wax fertilizer to lightly pat the buds.
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