What should we pay attention to when planting garlic and topdressing?

What should we pay attention to when planting garlic and topdressing? Please give guidance that garlic is a fertilizer-tolerant crop. On the basis of applying sufficient base fertilizer, topdressing is still needed in spring. The total amount of topdressing in high-yield fields is controlled at 25 jin of pure nitrogen and 10 jin of potassium. Fertilization should grasp that the period of vigorous growth of nutrition (the first and middle of April) is the maximum efficiency of nitrogen fertilizer, and the expansion period of garlic (Grain Rain ~ the Beginning of Summer) is the maximum efficiency of potash fertilizer, and nitrogen is the main nutrition in the period of leaf formation, and the earlier the nitrogen deficiency is, the greater the yield reduction is. In the expansion period of garlic, potassium deficiency had little effect in the early stage and great influence in the later stage. The elongation period of garlic bolting is the period of maximum absorption of nitrogen, phosphorus and potassium. Garlic is a sulfur-loving crop. Allicin is mainly a disulfide compound. Most of the proteins in garlic contain sulfur, which plays an important role in improving the quality of garlic. At the same time, the study shows that the nitrogen and sulfur absorbed by the plant can be used most effectively only when the fertilizer Nhammer S is close to the optimal value. In garlic, the content of Nipple S is about 12cm 1. The utilization rate of sulfur in calcareous soil in the north is 20.3%, and it is easy to be fixed as calcium sulfate, and the utilization rate of nitrogen is 303.35%. The best condition of N _ paw S is 4amp 5. Sulfur can not be reused in garlic. It is necessary to supplement sulfur in the middle stage of growth in order to maximize the fertilizer effect. According to the demand for nitrogen and sulfur in garlic, 40% nitrogen and sulfur fertilizer (N ≥ 17.5%, S ≥ 22.5%) was selected. Its fertilizer effect is long and quick-acting complementary, containing fulvic acid plays an important role in promoting garlic root growth, improving disease resistance and fertilizer utilization efficiency, and can promote the combination of root maintenance, avoid premature senility and increase yield. Supplementary application of return to green fertilizer: garlic can take advantage of rain and snow weather to sprinkle 40% nitrogen and sulfur fertilizer 15kg to 20kg. Re-application of seedling fertilizer: in the first ten days of April, 40% nitrogen and sulfur fertilizer was applied to 20kg / mu to meet the demand for nitrogen and sulfur for the exuberant growth of garlic. Good application of expansion fertilizer: 15 kilograms of high-nitrogen and high-potassium fertilizer was applied with water to accelerate the expansion of garlic. Click to get more garlic planting techniques click to get more vegetable planting techniques