The basic principles for the application of summer maize fertilization are nitrogen, phosphorus, potassium and micro-fertilizers; deep application of nitrogen fertilizer and top-dressing; water and fertilizer combination to improve fertilizer efficiency. It has been determined that for every 100 kilograms of corn grain produced, 2-3 kilograms of pure nitrogen, 0.8-1.5 kilograms of phosphorus pentoxide and 2-3 kilograms of potassium oxide need to be absorbed. According to the law of fertilizer demand of maize, a reasonable method of fertilization should be determined, and the proportion of appropriate fertilizer should be determined in order to achieve high quality and high yield of corn. Maize fertilization generally applies 1500-2000 kg of farmyard fertilizer per mu, 35-40 kg of urea or 90-102 kg of ammonium bicarbonate (16.1-18.4 kg pure), and 30-40 kg of calcium phosphate (purified P2O55.4-7.2 kg). Potassium sulphate 8-10 kilograms (K2O 4-5 kilograms) can also be used to fertilize other fertilizers or compound fertilizers with the same nutrients, while supplementing the corresponding nutrient elements in response to the shortage of nutrients. The fertilization method is: 1. Base fertilizer should be applied before basal fertilizer or planting summer corn sowing, mainly organic fertilizer and part of chemical fertilizer can be used in combination, and the former buckwheat can also be used to directly return straw to the field. However, appropriate amount of nitrogen fertilizer should be used to concentrate application. General use of 45% compound fertilizer 20 kg, plus 30-40 kg of superphosphate, plus potassium sulfate 5-6 kg. Zinc, molybdenum, boron and other trace element fertilizers can be used as basal fertilizers. The dosage is zinc sulfate 1-2 kg/mu, molybdenum sulfate 1 kg/mu, and borax 1 kg/mu. It can also be used as a seed dressing, soaking or foliar spray application. 2, top dressing fertilizer properly is the key. One is Miao Fei. Miaofei is a fertilizer that is applied after corn is planted. Generally, when the plants are visible in the leaves of 5-6 pieces, the nutrients in the endosperm of the seeds have been exhausted after the 3 leaves of the plants are developed. The roots begin to absorb nutrients from the soil, and the vegetative organs of corn grow vigorously. If nutrient supply does not follow At the same time, it will seriously affect the growth and development of corn. At this time, top dressing can meet the needs of growth and development and form strong seedlings. The amount of seedling fertilizer accounts for about 30% of the amount of topdressing nitrogen, and it is generally applied after the seedlings are set to before jointing. To lay a good Foundation for the spikes and ears. When sowing with a fertilizer field, can be appropriately reduced the amount of fertilizer and delayed application time. Generally, 3-5 kg ​​of urea can be topdressed per acre, or 10-15 kg of ammonium bicarbonate. The second is panicle fertilizer. Panicle fertilizer refers to 10-15 days before the tassels are extracted from the corn, and the top-dressing fertilizer can be applied when the leaves are 12-13 pieces. This period is a crucial period for determining the size of the ear and the number of grains. At the time of the differentiation of maize florets, vegetative growth and reproductive growth go hand in hand. Absolute amounts of nutrients and accumulative velocities of stems and leaves reach a peak, and roots need to absorb large amounts of nutrients from the soil. The nutrients of various organs are rapidly transmitted. Female ear. Applying panicle fertilizer in time can significantly increase corn yield. Pan-fertilizers generally account for 50%-60% of the total amount of fertilizers, and generally apply 18-20 kg of urea or 45-50 kg of ammonium bicarbonate and 3-4 kg of potassium sulfate per mu. Poor soil moisture conditions, and no irrigation conditions, can be used 2% urea solution for irrigation roots, 80-100 ml per plant irrigation. Clever use of foliar fertilizer foliar spray is generally applied at the seedling stage, jointing stage, and filling stage. Spraying 0.1%-0.3% zinc sulfate aqueous solution at the seedling stage can prevent the occurrence of corn white mosaic disease, spraying 0.2%-0.3% of potassium dihydrogen phosphate 2-3 times during the jointing stage, and it can resist the fall of strong stalks. Steady growth. Filling stage is a crucial period to determine the number of corn kernels and grain weight, and it requires a certain supply of nutrients. Fertilizer is used for fertilizing the soil and the effect is slow. If foliar spraying is used, the effect is rapid and the effect is significant. The type of fertilizer can be determined based on the appearance of corn. For example, NPK nutrient deficiency can be used 1.5 kg of urea, potassium dihydrogen phosphate 100 grams, 50-60 kg of water spray; NPK deficiency and zinc deficiency, in the above solution can be added by spraying 100 grams of zinc sulfate; Only those who need nitrogen, spraying 2% urea solution can be sprayed, usually spray 2-3 times. Make-Up Remover,Makeup Remover,Eye Makeup Remover,The Makeup Remover Guangzhou Lingxue Cosmetics Co., Ltd , https://www.lxgj188.com