Summer corn fertilization method

First, the principle of fertilization: The basic principles of summer maize fertilization is nitrogen, phosphorus, potassium and micro-fertilizer with the application of balanced fertilization; deep nitrogen fertilizer, top-dressing; water and fertilizer combination to improve fertilizer efficiency. According to the research, it is necessary to absorb 2 to 4 kg of pure nitrogen, 0.7 to 1.5 kg of phosphorus pentoxide, and 3.2 to 5.5 kg of potassium oxide per 100 kg of corn grain. 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.

Second, fertilization method. Summer corn sowing basal fertilizer. Mainly organic manure and partial chemical fertilizers are applied in conjunction with the application of crops. It is also possible to use the former stubble wheat to directly return straw to the field. However, appropriate amount of nitrogen fertilizer (nitrogen required for decomposition of straw) should be used to concentrate the application. General use of 25% compound fertilizer 40 kg, or ammonium bicarbonate 25 kg plus superphosphate 15-25 kg, plus potassium chloride 10-15 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, borax 1 kg/mu. It can also be used as a seed dressing, soaking or foliar spray application. Most interplanting corn plots are difficult to apply basal fertilizer. Generally, a small amount of decomposed farmyard manure or nitrogen fertilizer is used as a seed fertilizer, urea or diammonium phosphate is used as a seed fertilizer for 3--4 kg/mu, and the fertilizer is separated to prevent injury. Summer corn is suitable for soil top dressing. Summer corn soil dressing mainly to grasp the fertilization time and quantity. One is Miao Fei. Miaofei is a fertilizer that is applied after corn is planted. Generally, it is applied to the topdressing of 6 to 8 visible leaves of the plant. After the 3 leaves of the corn are opened, the nutrients in the seed endosperm have been exhausted. 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. Usually can be applied fertilizer 3-3-5 kg ​​urea per acre, or ammonium bicarbonate 10--15 kg. The second is panicle fertilizer. Panicle fertilizer refers to the application of topdressing fertilizer to the corn 14--16 days before the tassels are extracted. This period is the crucial period for determining the size of the ear and the number of seeds. 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. Panicle fertilizer generally accounts for 50% - 60% of the total amount of fertilizer, and generally applies 8-10 kg of urea per mu, or 20-25 kg of ammonium bicarbonate, or 15 kg of ammonium nitrate. Poor soil moisture conditions, and no irrigation conditions, can be used 2% urea solution for irrigation roots, irrigation 80--100 ml per plant. Summer corn top dressing. Fertilizers outside the roots are mainly sprayed with foliar fertilizers, which are generally applied during 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 at the jointing stage, and it can be strong Resist collapse, grow steadily. 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. Such as nitrogen, phosphorus and potassium nutrients can be used urea 1.5 kg, 100 kg of potassium dihydrogen phosphate, 50-60 kg of water spray; NPK deficiency and zinc deficiency can be added in the above solution of zinc sulfate 100 g spray Only those who need nitrogen, spraying 2% urea solution can be sprayed, generally spray 2 - 3 times can be, but must pay attention to the appropriate concentration, order of magnitude time in order to play a better role.

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