Change the ground and spread fertilizers to deep underground facilities. According to research, the deep application rate of ammonium bicarbonate is 50%, while the utilization rate of ground surface application is only about 28%; the utilization rate of underground urea is between 35% and 50%, and the utilization rate of ground surface is much lower. . Change the blind fertilization to see the sky, see the fields, see crops fertilize. Look at the sky is to see whether temperature, humidity, rainfall, light and other climate factors have no effect on fertilizer efficiency. According to the survey, the general temperature of 10 degrees Celsius ammoniation process takes 7 to 10 days, 20 degrees Celsius and 4 to 5 days, 30 degrees Celsius can be completed within 2 days. Therefore, when the temperature is high, topdressing urea is preferred, and when the temperature is low, ammonium bicarbonate should be topdressed. "Look at the ground" is due to soil fertilization. For example, clay soils have strong fertility, and the amount of nitrogen can be larger. Sandy soils have poor fertility, and top dressing should be based on the fertilization principle of “eat less foodâ€. “Look at crops†is to find out the factors that affect the yield of nutrients in different crops, identify the factors that affect the yield of the soil, and the peak demand of various crops for fertilizers, and combine fertilizer characteristics to achieve formula fertilization. Change the fertilizer to single application of nitrogen and phosphorus. The nitrogen and phosphorus elements needed for crop growth are most closely related to each other and have mutual promotion effects. This is particularly evident in the fields with low fertility. According to the survey, the utilization rate of single nitrogen fertilizer is only 35.3%, while the utilization ratio of nitrogen and phosphorus is increased to 51.7%. Select the root outside fertilization time and concentration. The fertilizer efficiency of foliar spray fertilizer is related to the length of time the solution stays on the leaf. When the light is strong and the temperature is high, the moisture evaporates quickly and the nitrogen is difficult to enter into the plant cells. When sprayed during rainfall, nitrogen is easily lost. Therefore, the most suitable time for spraying fertilizer is cloudy days and no rain, or after 4 pm. At the same time, the solution used should also be differentiated according to different seasons and crops.
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