1. Determine the type of fertilizer to be applied according to the difference in soil pH. Under normal circumstances, acidic fertilizers such as ammonium sulfate should be used for low-alkali soils; alkaline or neutral fertilizers such as urea, ammonium bicarbonate and ammonia should be applied to acidic soils; sandy soils and sandy loam soils with poor water retention and fertilizer retention capacity should be traced to non-volatile Fertilizers such as ammonium chloride and urea. At the same time, during the topdressing period, it is best to increase the number of top dressings and reduce the amount of fertilizer applied each time to prevent the volatilization and loss of fertilizer.
2. Treat according to the nature and composition of chemical fertilizers. The application of ammonium chloride and urea in paddy field can inhibit nitrification and reduce leaching, but it should not be used in saline soil to avoid accumulation of chloride in the soil and increase salt damage. At the same time, it can not be applied to crops such as tobacco, sugar beet and potato, so as not to reduce its yield and quality. Urea is suitable for various crops and various types of soil, but it can be released in the soil to release fertilizer and be absorbed by crops. . Therefore, when using urea as a top dressing, it is a few days ahead of other nitrogen fertilizers, and at the same time, deep application of soil to improve fertilizer efficiency.
3, according to the type of crops, the right medicine, on demand. For example, rice can be topdressed with 230-370 kg of ammonium sulfate or 180-200 kg of urea per hectare; corn and sorghum need more nitrogen fertilizer. The application of base fertilizer and seed fertilizer can not meet the needs of crops for nitrogen fertilizer, and it is necessary to fill in a certain amount in time. Nitrogen fertilizer, 150-190 kg of urea per hectare; soybean is also a crop that requires more nitrogen fertilizer. The nitrogen fixation of root nodules can only satisfy about 50% of the nitrogen fertilizer needed in the whole growth period, and the effect of timely applying nitrogen fertilizer is very good. Fertilizer can be topdressed with 130-170 kg of urea per hectare; sunflowers require higher fertilizers than grass crops due to high plant height, deep roots and large plates, and can apply 170-190 kg of urea per hectare.
4. It is necessary to grasp the critical period and maximum efficiency period of various crop nutrients, so as to carry out topdressing in the nutrient period. Early wheat topdressing has obvious effect of increasing yield. It should be applied once in the three-leaf stage to lay a foundation for cultivating strong seedlings and large ears. Soybeans can topdress secondary nitrogen fertilizer at the early flowering stage, which can reduce the rate of falling flowers and pods, and Prolong the lifespan of plants, increase grain weight and yield; corn is the peak period of nutrient absorption after jointing to big bell mouth. The second fertilizer should be applied, and the second fertilizer should be applied before heading; rice should be greened, At the jointing and heading stage, each fertilizer is applied once; the sunflower can be topdressed in the bud stage.
2. Treat according to the nature and composition of chemical fertilizers. The application of ammonium chloride and urea in paddy field can inhibit nitrification and reduce leaching, but it should not be used in saline soil to avoid accumulation of chloride in the soil and increase salt damage. At the same time, it can not be applied to crops such as tobacco, sugar beet and potato, so as not to reduce its yield and quality. Urea is suitable for various crops and various types of soil, but it can be released in the soil to release fertilizer and be absorbed by crops. . Therefore, when using urea as a top dressing, it is a few days ahead of other nitrogen fertilizers, and at the same time, deep application of soil to improve fertilizer efficiency.
3, according to the type of crops, the right medicine, on demand. For example, rice can be topdressed with 230-370 kg of ammonium sulfate or 180-200 kg of urea per hectare; corn and sorghum need more nitrogen fertilizer. The application of base fertilizer and seed fertilizer can not meet the needs of crops for nitrogen fertilizer, and it is necessary to fill in a certain amount in time. Nitrogen fertilizer, 150-190 kg of urea per hectare; soybean is also a crop that requires more nitrogen fertilizer. The nitrogen fixation of root nodules can only satisfy about 50% of the nitrogen fertilizer needed in the whole growth period, and the effect of timely applying nitrogen fertilizer is very good. Fertilizer can be topdressed with 130-170 kg of urea per hectare; sunflowers require higher fertilizers than grass crops due to high plant height, deep roots and large plates, and can apply 170-190 kg of urea per hectare.
4. It is necessary to grasp the critical period and maximum efficiency period of various crop nutrients, so as to carry out topdressing in the nutrient period. Early wheat topdressing has obvious effect of increasing yield. It should be applied once in the three-leaf stage to lay a foundation for cultivating strong seedlings and large ears. Soybeans can topdress secondary nitrogen fertilizer at the early flowering stage, which can reduce the rate of falling flowers and pods, and Prolong the lifespan of plants, increase grain weight and yield; corn is the peak period of nutrient absorption after jointing to big bell mouth. The second fertilizer should be applied, and the second fertilizer should be applied before heading; rice should be greened, At the jointing and heading stage, each fertilizer is applied once; the sunflower can be topdressed in the bud stage.
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