The amount of fertilizer needed for corn: The effect of increasing fertilization on maize depends on soil type, basic fertility, seeding season, yield level, variety characteristics, ecological environment, fertilizer type, ratio, and fertilization technology. The total amount of nitrogen, phosphorus, and potassium absorbed by corn increased with the increase of the yield level. In most cases, the main nutrient absorbed by corn during its lifetime is nitrogen, followed by potassium and phosphorus. Under normal normal production level, 2000-3500 kg of organic fertilizer, 20-30 kg of nitrogen fertilizer, 40-50 kg of superphosphate, 10-15 kg of diammonium phosphate and 10 kg of potassium phosphate per mu of sweet and waxy corn can be applied. - 15 kg, 1 kg of zinc sulfate. If compound fertilizer is used, it can also be estimated accordingly. At present, fertilizer types used in the southern areas include decomposed farmyard manure, urea, ammonium bicarbonate, ammonium sulfate, ammonium chloride, superphosphate, calcium magnesium phosphate fertilizer, potassium chloride, potassium sulfate, grass ash and compound fertilizer. It is basal fertilizer, Miaofei (joining section fertilizer) and attacking manure fertilizer. Some farmers use the base fertilizer or joint fertilizer "a shelling" fertilization method is likely to cause early growth of the plant too fast, poor lodging resistance, late defermentation, premature aging. Note on fertilization: South China has more rain, poor soil quality, poor fertility for water conservation, and in addition, seasonal spring, summer, or autumn drought often occurs in most areas. Nitrogen fertilizers should be applied to fertilization, and roots should be promoted with phosphorus to provide phosphorus. Roots are promoted, and fertilizers are used to divert water to improve the function of water absorption and water retention of corn and to increase the efficiency of fertilizer use. 1. Compared with ordinary corn, sweet and waxy corn has a short growth period and rapid growth and development in the early period. Therefore, it is necessary to focus on the application of base fertilizer and seed fertilizer, and to top-dress fertilizer earlier; the growth of sweet and waxy corn at the seedling stage is not as strong as that of ordinary corn. The period should not be controlled. In addition, the application of farmyard manure and appropriate application of phosphorus and potassium fertilizers will help improve the quality of sweet and waxy corn. 2. Principles of fertilization: First, organic fertilizer is dominant, and chemical fertilizer is the supplement; second, nitrogen, phosphorus, and potassium balance. According to the target output nitrogen, and then according to the ratio of phosphorus and potassium fertilizer. The type and amount of fertilizer should be determined based on the target yield; third, the balance of trace elements. Follow the rule of fertilizer requirement and soil nutrient status of the crops and adopt the principle of lack of supplements. In fertilizer maneuvering, the principle of applying basic fertilizer, appropriate amount of fertilizer, light application of seedling fertilizer, skillful application of joint fertilizer, and heavy panicle fertilizer should be followed. Fertilizer amount and fertilizer type can be adjusted according to different varieties, different fertility, different seasons and different seedling conditions. The production of pollution-free agricultural products shall be governed by the General Principles of NY/T496 (Fertilizer Appropriate Use Guidelines), which shall be mainly organic fertilizers and combined with inorganic fertilizers; industrial wastes, municipal wastes and sludge shall not be used; The organic fertilizer that has not reached the pollution-free disposal and the heavy metal exceeds the standard. 3. Fresh corn due to short growth period, need to concentrate fertilizer time, nitrogen fertilizer generally use 20%-30% base fertilizer, jointing fertilizer (miaofei) accounted for 30% -40%, attacking manure (panicle) 30%-40 %, strong fertilizer accounts for 0-5%. Based on the application of basal fertilizer, the topdressing should be carried out twice at the jointing stage and at the big bellmouth stage. Due to harvesting of fresh spikes, it is generally less or no application of granules. If the foundation of soil fertility is low, or if there is no basal fertilizer or seed fertilizer, the “pre-medium-light†allocation method can be used, that is, the top-dressing fertilizer will account for about 60% of the total fertilizer, and the big bell-mouth will account for about 40%. If the soil is fat or applied with basal fertilizer and seed fertilizer, the method of “pre-light weight and medium weight†should be adopted, that is, top dressing fertilizer accounts for about 40%, and big bell mouth period accounts for 60%. 4. The application amount and application method of fertilizer should be reasonable. When top dressing, attention should be paid to changing topsoil to gully application or hole application; fertilization and natural rainfall or irrigation should be combined to increase fertilizer efficiency. By increasing the application of organic fertilizer, ingenious nitrogen fertilizer and balanced fertilization, the excessive accumulation of nitrate in fresh corn was controlled. Nitrogen fertilizers were topdressed and nitrogen application was stopped about 25 days before harvest. 5. Use soil-fertilizer-recommended formulas and formula-specific fertilizers. To purchase chemical fertilizers at fixed agricultural resources outlets, obtain and properly save invoices. Water Management: The requirements for water in different growth stages of corn are different. During the whole growth period, the water consumption has a great relationship with the soil, climatic conditions and cultivation techniques. When sowing, good soil moisture is the guarantee for realizing Miaoquan, Miao Qi, Miao Zhuang and Miao Miao. If the soil moisture content is insufficient or uneven, sowing seedlings will inevitably result in the lack of seedlings and ridges, or the size of seedlings will be uneven, and there will be many weak plants and high empty stalks. Suitable soil moisture for maize sowing is 65%-75% of the field water capacity. If it is less than 65%, it must be sown after sowing. Maize seedlings are more tolerant to drought, ensuring that the soil water holding capacity is 50%-60%, and the soil water holding capacity after jointing should rise to about 70%. In the first 10 days of tasselling, he entered the period of the most sensitive to water, and in this case, he encountered a “card neck droughtâ€, which would seriously affect the number of corn ear rows and rows of grains. During the grain filling stage, sufficient water is needed to maintain the normal functional period of the leaves and increase the grain weight. Dry water shortage can cause baldness, lack of grain, and reduced grain weight. Therefore, from the time of seeding to the seedling stage, it is mainly moist, over dry and over. Wetness is not conducive to the emergence and growth of seedlings. During the seedling stage, maintain the alternating wet and dry state. Sweet corn seeds have many sugars and few starches. Irrigation after sowing can cause bad seeds. Watering after 3-4 leaves can be considered. Before and after tasselling, the filling period is a critical period for sweet and waxy maize water requirements. It must meet the requirements and this stage should be maintained. Wet soil; a few days before harvest, appropriate water control to improve quality. Winter corn is irrigated once before the low temperature comes. It helps prevent frost and increases the cold resistance of plants. Sweet, glutinous corn hi wet afraid of pick stains. In southern China, there is more rain, especially in summer and autumn. In order to prevent corn from being sucked, drainage ditches should be dug around the land, and clear ditches should be observed. In the event of a typhoon, rainwater should be drained and brought down in time to reduce losses. Seedling pest management: In addition to taking seed coating on plots of land where pests often occur, it is possible to use poisonous soils for sowing or sowing when applying pesticides: for example, 50% phoxim per acre 200 - 250 grams of water, 1-2 kilograms of fine soil, 25-30 kilograms, mix well and apply ridges, or use 40% chlorpyrifos EC 150-180 grams / acre with watering when sowing. Abs First Aid Bag,Abs First-Aid Devices Box Bag,Plastic First Aid Box,Medical Mini Abs First-Aid Kit Shaoxing Weijian Medical Supplies Co.,Ltd. , https://www.wetourmedical.com