Two bogey on the ground. Urea is applied to the surface, and it can be absorbed by the crop after 4 to 5 days of transformation at room temperature. Most of the nitrogen is volatilized during the ammoniumification process, and the utilization rate is only about 30%, if it is high in alkaline soil and organic matter. The soil is applied and the loss of nitrogen is much faster. Therefore, nitrogen cannot be applied to the surface.
Three bogey for seed fertilizer. Urea often produces small amounts of biuret during the production process. If the biuret content exceeds 2%, it will be toxic to seeds and seedlings. When urea enters seeds and seedlings, it denatures proteins, affecting seed germination and seedling growth.
After the four bogey, immediately fill the water. Urea is an ammonia nitrogen fertilizer, which must be converted into ammonia nitrogen after application to be absorbed and utilized by crops. The conversion process is different due to different conditions such as soil quality, moisture and temperature. The time is long and short. It usually takes 2 to 10 days to complete. If the urea is applied immediately after irrigation or the dry land is applied before heavy rain, the urea will dissolve in water and be lost. .
Five bogey and mixed with alkaline fertilizer. Urea must be converted to ammonia nitrogen after application to be used by crops. Ammonia nitrogen Under alkaline conditions, most of the nitrogen will become ammonia gas volatilization, so urea can not be mixed with or applied with alkaline fertilizers such as lime, grass ash, calcium magnesium phosphate.
Six bogey on the celery. During the whole growth period of celery, a large amount of nitrogen fertilizer should be applied, but urea cannot be applied. Because of the application of urea, the celery fiber is thicker and thicker, the plant is aging, the growth is slow, and the taste is bitter and the quality is inferior. Celery is suitable for the application of ammonium bicarbonate, ammonia and organic fertilizers, which is beneficial to improve quality.
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