Summer corn science fertilization promotes high quality and high yield

   The basic principle of fertilization of summer corn is the combination of nitrogen, phosphorus, potassium and micro-fertilizer, balanced fertilization; deep application of nitrogen fertilizer, staged topdressing; combined water and fertilizer to improve fertilizer efficiency. It is determined that for every 100 kg of corn kernels produced , 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 . According to the law of fertilizer demand of corn, determine the reasonable fertilization method, and determine the appropriate proportion of fertilizer to achieve high quality and high yield of corn.

Base fertilizer or seed fertilizer Summer corn should be applied before the planting, mainly organic fertilizer and some chemical fertilizers. It can also be used to directly return the straw to the wheat, but it should be applied with appropriate amount of nitrogen fertilizer. Generally use 45 % 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 elements as basal fertilizer can be administered, zinc sulfate in an amount of 1 to 2 kg / acre, molybdenum sulfate 1 kg / acre, borax 1 kg / acre. It can also be applied as seed dressing, soaking or foliar spray. Most of the intercropped cornfields are difficult to apply base fertilizer. Generally, a small amount of decomposed farmyard manure or nitrogen fertilizer is used as seed fertilizer, and urea or diammonium phosphate is used as seed fertilizer of 3~4 kg / mu, separated by fertilizer to prevent injury.

The best for topdressing is the first one. Miao fertilizer is a fertilizer applied after corn planting. Generally, it is applied in the 6~8 visible leaves of the plant. After the 3 leaves of the corn are unfolded, the nutrients in the seed endosperm are exhausted, the roots begin to absorb nutrients from the soil, and 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 ear and big ears. 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 . The second is the ear fertilizer. 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 14 to 16 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. Spike fertilizer generally accounts for 50%~60% of the total fertilization amount . Generally, 8~10 kg of urea is applied per acre or strip , or 20~25 kg of ammonium bicarbonate , or 15 kg of ammonium nitrate . 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 .