Miao fertilizer is a fertilizer applied after corn planting. Generally, it is applied in the 5~6 visible leaves of the plant. After the 3 leaves of the corn are unfolded, the nutrients in the endosperm of the seed have been exhausted, and the roots begin to absorb nutrients from the soil. The vegetative organs of the corn grow vigorously, if the nutrient supply is not On the top, it will seriously affect the growth and development of corn. At this time, the top dressing can meet the needs of growth and development and form a strong seedling. The amount of seedling fertilizer accounts for about 30% of the amount of nitrogen, and it is usually after the seedling to the top dressing before jointing. Make a good foundation for the big ear and the ear. Fields with seed fertilizer at the time of sowing can appropriately reduce the amount of fertilizer used and delay the time of application. Generally, it can be used for 3 to 5 kg of urea per mu, or 10 to 15 kg of ammonium bicarbonate.
Spike fertilizer refers to the topdressing of corn before the tassels are taken out for 10 to 15 days. The topdressing of the leaves is 12 to 13 pieces. This period is the key period for determining the size of the ears and the number of grains. At the peak of the differentiation of maize and florets, the vegetative growth and reproductive growth progressed. The absolute amount and accumulation rate of nutrients absorbed by stems and ears reached the peak. The roots needed to absorb a large amount of nutrients from the soil, and the nutrients of various organs were quickly transferred. Ears. Timely application of panicle fertilizer can significantly increase corn yield. Generally, the application of nitrogen fertilizer in panicle fertilizer accounts for 50%~60% of the total fertilization amount. Generally, 18~20 kg of urea is applied per acre or strip, or 45~50 kg of ammonium carbonate and 3~4 kg of potassium sulfate. If the soil moisture is poor and there is no irrigation condition, 2% urea solution can be used as the root fertilizer, and 80~100 ml per plant.
Foliar fertilizer application is generally applied in the seedling stage, jointing stage and filling stage. Spraying 0.1%~0.3% zinc sulphate solution in the seedling stage can prevent the occurrence of corn white seedling mosaic disease. Spraying 0.2%~0.3% potassium dihydrogen phosphate 2~3 times at jointing stage can stabilize the stalk. Steady growth. The filling period is a key period for determining the grain number and grain weight of corn. It requires a certain amount of nutrient supply. The soil fertilization uses more fertilizer and the effect is slower. If foliar spray fertilizer is adopted, the effect is fast and the effect is remarkable. The type of fertilizer can be determined based on the growth of the corn. For example, if the nitrogen, phosphorus and potassium nutrients are insufficient, 1.5 kg of urea, 100 g of potassium dihydrogen phosphate, and 50-60 kg of water can be sprayed; nitrogen, phosphorus and potassium are insufficient and zinc is deficient, and zinc sulfate can be added to the above solution. Spraying; only need nitrogen, spray 2% urea solution on the foliar surface, usually spray 2~3 times.
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