Vegetable Formula Fertilization

Third, boron room vegetables

1. Principle of Fertilization: Determine the amount of fertilizer according to the yield of vegetables and soil nutrients, and determine the fertilization period according to the nutritional and physiological characteristics of the vegetables. Organic fertilizers and phosphate fertilizers are used as base fertilizers before sowing and planting vegetables. The frequency of topdressing can be determined according to the length of the growing period of the vegetables. Vegetables with a short growth period can be top-dressed 1-2 times in the middle growth period. Vegetables with a long growing period can be top-dressed 3-4 times during the period when the nutrients need more, generally 14-20 days. Top dressing 1-2 times. According to different vegetables and different fertilizers to determine the method of fertilization, phosphate fertilizer is easily fixed by the soil and should be used in a centralized manner. Nitrogen and potash fertilizers are generally used to open channels and apply Shihe points. In the later stages of fertility, they can also be applied with water or foliar spray.

2, the applicable method: 1 increase organic fertilizer. The application of organic fertilizer with high cellulose content (ie, high C/N ratio) can greatly enhance the nutrient buffering capacity of the soil, prevent the accumulation of salts and delay the process of soil salinization; 2 deepen the soil tillage layer. Since the salt in the protected soil accumulates into a polycondensation type, after the harvest of the vegetables, deep turning is required to turn the topsoil rich in salts to the lower layer, turning the lower soil with relatively less salt to the top, which can be greatly reduced Salt damage; 3 withdrawal film washing salt. Use a change of clearance, rain, salt or irrigation salt. After the summer vegetables are harvested, the film is peeled off, and if it is not covered with film for several dozen days during the rainy season, the sun and the rain will be effective in eliminating soil barriers. Or in the hot season to flood the water, the ground cover mold to increase the temperature of the water, so that not only can wash the salt, but also can extinguish the bacteria, the advantages of high yield and stable production of vegetables; 4 base fertilizer deep application, top dressing limit. When using chemical fertilizers as base fertilizers, when deeper, top dressings should be “few times”. It is best to apply fertilizers and organic fertilizers to the ground and plow till. Topdressing is generally difficult to deepen, so it should strictly control the amount of each fertilizer, rather increase the frequency of top dressing to meet the vegetable nutrient requirements, can not be applied too much at once, resulting in increased concentration of soil solution; 5 to promote the top dressing. Plants rely mainly on roots to absorb nutrients, while leaves and stems can also directly absorb nutrients from solutions sprayed on the surface. In protected cultivation, because top dressings do not add “trouble” to the soil, they should be promoted. Urea, superphosphate and potassium dihydrogen phosphate, as well as some trace elements, are suitable as top-dressing fertilizers.