Spring returns to the earth, everything recovers, and all parts of the country continue to enter the spring ploughing and production, which is the "opening song" of agricultural production every year. Scientific preparation of fertilizer and fertilization is an important part of spring cultivation, and it is the basic guarantee for the bumper harvest of agriculture. To this end, "China Agricultural Materials" has compiled some key techniques and precautions for spring ploughing and fertilizer preparation. It is for readers' reference only. Spring ploughing fertilizer should be based on organic fertilizer and nitrogen, phosphorus and potassium fertilizers. Specific fertilizers vary from crop to crop. For organic crops such as corn, rice, soybean, cotton, spring wheat and other field crops, most of the phosphorus and potassium fertilizers and not more than half of the total nitrogen fertilizer are used as base fertilizer, and the rest are used for topdressing or seed fertilizer; For fruit trees and vegetables, it is necessary to apply organic fertilizer, part of nitrogen, phosphorus and potassium fertilizer as base fertilizer, and the rest for topdressing. In addition, we must continue to pay attention to the supplement of trace elements. Compound fertilizer is the main fertilizer in spring ploughing period The base fertilizer should mainly be used in combination with suitable compound fertilizer, or appropriate amount of urea, superphosphate, potassium chloride or potassium sulfate; the northern region may use diammonium phosphate as the base fertilizer or fertilizer, but diammonium It is a kind of high-phosphorus, low-nitrogen and potassium-free binary compound fertilizer. It should be mixed with appropriate amount of nitrogen and potassium fertilizer. For large fields that have long-term high yields without applying organic fertilizers, attention should be paid to the application of trace elements. In addition, it is necessary to focus on the lack of performance of sensitive crops, such as rice, corn is prone to zinc deficiency, cotton, rapeseed is easy to lack boron, peanuts, soybeans are prone to calcium deficiency, iron, molybdenum. If it is lacking, it can be used with a combination of foliar fertilizer and base fertilizer. Compound fertilizer can be used as the base fertilizer for many crops and is the main fertilizer for spring ploughing. When purchasing compound fertilizers, pay attention to whether the ratio of nutrient distribution is suitable for local soil and crops. The total amount of nitrogen (N) phosphorus (P2O5) potassium (K2O) applied in the first season of the field crop is about twice or more than that of phosphorus, half or less of which is used as the base fertilizer, and the rest is mainly used as top dressing. The base fertilizer should be a general-purpose compound fertilizer with roughly the same proportion of nitrogen, phosphorus and potassium. In southern acid soils and potassium-producing crops, the proportion of potassium may be appropriately high; the proportion of nitrogen in legumes may be appropriately low. If it is a one-time fertilization, a high-nitrogen compound fertilizer containing about twice the amount of nitrogen should be used, and the amount of fertilizer applied should be increased accordingly. Set production in order to produce fertilizer The key to spring fertilization is to determine the amount of base fertilizer applied and its proportion throughout the growth period and adopt appropriate fertilization methods. First, the production will be fixed according to the local conditions, and then the fertilizer will be produced. Determine the target yield (or estimate by increasing the average value of continuous high yield in the past 3 years by 10%-15%), and calculate the corresponding fertilization amount based on the soil fertilization results. It should be noted that the relationship between yield and fertilization amount is that the amount of fertilization increases with the increase of target yield, rather than the increase of yield with the increase of fertilization amount. To control the proportion of fertilization period of nutrient supply, the law of crop growth and nutrient absorption is a S-shaped curve: the seedling stage is less, the prolonged period is more, and the later stage tends to stop. The proportion of nitrogen in the base fertilizer, except for one-time fertilization and drought-deficient areas, generally does not exceed 50% of the total growth period, which must be determined and implemented when applying spring fertilizer. In the spring ploughing period, the method of spreading is usually adopted to combine the ploughing and land preparation to achieve the integration of soil and fertilizer. For calcium, magnesium and phosphate fertilizers, soil acidity can also be used to improve fertilizer efficiency; when cultivating crops such as spring wheat and other dense crops, such as corn, when fertilization is small, it is advisable to use strip application or point application method to make the limited fertilizer closer to the root system. In addition, when soybeans and corn in the Northeast and other regions are mechanized for one-time fertilization, the fertilizers should be applied to soil layers of different depths, and the amount of base fertilizer and nitrogen fertilizer should be appropriately increased. This article website: Detailed explanation of key technologies for spring tillage and fertilization Meltblown Cloth KN95 Face Mask Kn95 Protective 3D Mask,Kn95 5 Layers Respirator,Meltblown Cloth Kn95 Face Mask,Kn95 5 Layers Fold Flat Face Mask Jiangmen anjian biotechnology co. LTD , https://www.jmanjianmask.com