A look at the types of fertilization beans rhizobium nitrogen fixed nutrients, the need for less nitrogen, the need for more phosphorus; root vegetables, yams need more potassium; leafy vegetables only need more nitrogen fertilizer; fruits and vegetables in the application Based on nitrogen fertilizer, phosphorus and potash fertilizers are also required.
Second, the soil is fertilized with different soil properties, and fertilization methods are not the same. The light loam soil has good fertilizer and fertilizer properties, and can be applied and reused. Sandy soil can be fertilized many times, but the amount is less to prevent fertilizer waste. Excessively hardened to pay attention to more cooked organic fertilizer.
Third, climate and fertilization Summer temperatures are high, decomposition of fertilizers is fast, rainfall is high, and fertilizers are easily lost. When fertilizing, it is necessary to adopt the method of less quantity and more times, and the mature farmyard fertilizer should be applied timely and dispersedly. Apply more on sunny days and less on rainy days. On the contrary, in winter, the temperature is low and there is little rain. The decomposed farmyard fertilizer should be applied early and the chemical fertilizer should be developed.
Four to see the seedling fertilization generally grasp the principle of "fewer seedlings, stable flowering, fruit weight" principle, the early stage of nitrogen fertilizer, nitrogen, phosphorus and potassium in the middle and late. However, varieties have different ripeness and fertilization. Early maturing cultivars have a short vegetative growth period, and they should focus on the promotion in the early stage and lay the foundation for high yields. Late maturing cultivars have a long period of vegetative growth, and early-stage cultivars focus on the control and promotion of binding to enable the seedlings to grow steadily. In the seedling stage of the melons, deterrence water with a concentration of 10%-15% is generally applied, and as the plants grow, they can be gradually enriched. By the late growth stage, it can generally be increased to 30% to 40%.
Five fertilizers Fertilizer farm fertilizer effect long, full of nutrients, not easy to cause leggy, generally used as base fertilizer, long-term breeding varieties can be buried fertilizer method. Fertilizer fertilizer effect is fast, nutrients are incomplete, fertilizer thick easily lead to leggy, only suitable for top dressing and a small amount of base fertilizer. Ammonium bicarbonate is volatile and can be used as a base fertilizer. If it is used for topdressing, it should be applied 10 centimeters away from the roots of the crop, and it should be covered in a timely manner to avoid smudging crops. Urea is generally used as a top dressing and should be applied 4-6 days in advance in order to exert its fertilizer efficiency. Phosphate mobility is small, generally for fertilizer, top dressing. For topdressing, it is necessary to open the ditch and apply it to the root layer.
Sixth, the fertilized ferric ammonium sulphate, human fecal urine and other nitrogen fertilizers are acidic and cannot be mixed with alkali ash such as grass ash to avoid reducing fertilizer efficiency. Superphosphate cannot be mixed with acidic fertilizers. Ammonium bisulfate and urea are in contact with species, stems and leaves, which can cause burns. The urea is used as a top-dressing fertilizer, and its concentration should not exceed 1%. Ammonium chloride and potassium chloride cannot be used on potato and other bogey crops.
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