A bogey and alkaline fertilizer mixed or simultaneous application. Basic fertilizers include grass ash, lime, molybdenum-magnesium-phosphate fertilizers, etc. If mixed urea is applied or applied at the same time, the nitrogen in urea will become ammonia and volatilize. Therefore, in summer and autumn, urea and alkaline fertilizers should be staggered for 3-4 days, and winter and spring should be staggered for 7-8 days.
Second taboo for seed dressing. Urea as a seed fertilizer, so that the seeds lose their germination, but also endanger the seedlings. At the same time, because high-concentration urea can damage the protein structure of seeds and have toxic and inhibitory effects on seeds, it is not suitable for seed fertilizers. If it must be used as a seed fertilizer, avoid seed and fertilizer contact and control the amount.
Three bogey immediately after the application of water. Ammonium nitrogen has very low adsorption capacity with soil colloids, and its mobility and loss in the soil is not less than that of nitrate nitrogen fertilizers. Therefore, after topdressing urea, do not water it before the conversion is completed, otherwise the waste will be wasted. Generally summer and fall seasons should be watered 2-3 days after application, winter and spring season should be watered 7-8 days after application. After cultivating after planting, soil and fertilizer are blended, and urea cannot be applied before heavy rain.
Four bogey shallow Shi. Urea is easily applied and is easily consumed by weeds. Deep application of urea, melting of fertilizer in soil, fertilizer in a moist soil, is conducive to the exertion of fertilizer efficiency. For fertilizer application should be applied next to the seedlings or ditch applied on the seedling side, the depth should be about 10-15 cm. In this way, urea is concentrated in the root dense layer, which facilitates crop absorption and utilization. Tests have shown that deep application of shallower application can increase the utilization of urea by 10-30%.
5. Avoid excessive usage. The nitrogen content of urea is high and the application amount should not be too large, so as to avoid unnecessary waste and “fat harmâ€. Usually 5-15 kg per mu, 15-20 kg of paddy per acre. Excessive application cannot be absorbed by the soil before it is converted to ammonium bicarbonate. It is easily washed away by rain and is easily damaged.
Six bogey high concentration foliar spray. Foliar spray should not be too concentrated urea solution, otherwise it will burn the leaves, but also poison plants. Vegetable melons should be 0.5-1.5%.
Seven bogey applications too late. Urea application is too late, is not conducive to the exertion of fertilizer efficiency, easy to cause crops greed green late, it should generally be applied 4-7 days earlier than other nitrogen fertilizer.
Eight bogey single application. The active ingredient of urea is nitrogen, and crop growth requires multiple nutrients. Urea should be applied in combination with organic fertilizers, phosphorus, and potassium fertilizers to meet the needs of crops for various nutrients. It can also accelerate the conversion and decomposition of urea, and is quickly absorbed by crops to increase the utilization of urea. (Liu Xiangxiang)
Second taboo for seed dressing. Urea as a seed fertilizer, so that the seeds lose their germination, but also endanger the seedlings. At the same time, because high-concentration urea can damage the protein structure of seeds and have toxic and inhibitory effects on seeds, it is not suitable for seed fertilizers. If it must be used as a seed fertilizer, avoid seed and fertilizer contact and control the amount.
Three bogey immediately after the application of water. Ammonium nitrogen has very low adsorption capacity with soil colloids, and its mobility and loss in the soil is not less than that of nitrate nitrogen fertilizers. Therefore, after topdressing urea, do not water it before the conversion is completed, otherwise the waste will be wasted. Generally summer and fall seasons should be watered 2-3 days after application, winter and spring season should be watered 7-8 days after application. After cultivating after planting, soil and fertilizer are blended, and urea cannot be applied before heavy rain.
Four bogey shallow Shi. Urea is easily applied and is easily consumed by weeds. Deep application of urea, melting of fertilizer in soil, fertilizer in a moist soil, is conducive to the exertion of fertilizer efficiency. For fertilizer application should be applied next to the seedlings or ditch applied on the seedling side, the depth should be about 10-15 cm. In this way, urea is concentrated in the root dense layer, which facilitates crop absorption and utilization. Tests have shown that deep application of shallower application can increase the utilization of urea by 10-30%.
5. Avoid excessive usage. The nitrogen content of urea is high and the application amount should not be too large, so as to avoid unnecessary waste and “fat harmâ€. Usually 5-15 kg per mu, 15-20 kg of paddy per acre. Excessive application cannot be absorbed by the soil before it is converted to ammonium bicarbonate. It is easily washed away by rain and is easily damaged.
Six bogey high concentration foliar spray. Foliar spray should not be too concentrated urea solution, otherwise it will burn the leaves, but also poison plants. Vegetable melons should be 0.5-1.5%.
Seven bogey applications too late. Urea application is too late, is not conducive to the exertion of fertilizer efficiency, easy to cause crops greed green late, it should generally be applied 4-7 days earlier than other nitrogen fertilizer.
Eight bogey single application. The active ingredient of urea is nitrogen, and crop growth requires multiple nutrients. Urea should be applied in combination with organic fertilizers, phosphorus, and potassium fertilizers to meet the needs of crops for various nutrients. It can also accelerate the conversion and decomposition of urea, and is quickly absorbed by crops to increase the utilization of urea. (Liu Xiangxiang)
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