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(1) Topdressing should be applied in depth:
Paddy fields, dry land, and urea are all better. Urea is placed in a soil layer of 10-15 cm. Generally, the soil colloid has a high adsorption capacity for ammonia, and the nitrogen utilization rate is generally increased by 15%-20%.
(2) Topdressing should be applied in advance:
When urea is used for topdressing of summer, autumn and winter crops such as rice, corn, sorghum and sugar cane, it should be applied 2-3 days earlier than other chemical nitrogen fertilizers; for wintering crops such as wheat, barley, rapeseed, and broad beans, it should be 6-8 days in advance. Apply. Only in this way can we fully exert the fertilizer effect and increase production of urea.
(3) Appropriate amount:
Urea should be used as a top dressing to reduce the amount. Especially in the hot season, such as 20 kg of ammonium bicarbonate, only 7.5 kg of urea.
(4) Due to soil topdressing:
Urea is applied in different soils, and its volatilization loss is different. Generally, the soil with high organic matter content and high water retention and fertility can reduce the number of top dressings appropriately, and the amount of topdressing can be appropriately increased. On the contrary, sandy loam, thin soil, etc. should be used less frequently. Shi.
Precautions:
Urea for topdressing should be strictly staggered with alkaline fertilizer, staggered for 3-4 days in summer and autumn, and 7-8 days in winter and spring. Urea can be applied simultaneously with acidic fertilizers such as calcium superphosphate, potassium sulfate, potassium chloride, etc., and should be flooded immediately after application, otherwise it will leaching and reduce fertilizer efficiency.
Dry land should be covered with deep soil. If the paddy field is not drained and fertilized, it can not be drained within 6-7 days after application. It is best to control the shallow water layer, and then cultivate after fertilization to promote the integration of soil and fertilizer and avoid nitrogen leaching.
Avoid the excessive concentration of foliar spray, the spraying concentration of cereal crops is about 2%, the fruit trees are about 0.5%, and the vegetables are about 0.5%-1.5% between the two. The crop growth period and adult fruit trees, the discharge concentration can be appropriately larger. Foliar application will keep it moist for 30-60 minutes, and it is better to spray it before 9:00 am and after 4 pm on sunny days.
Urea should not be mixed with seeds.
Urea fertilizer application technology
When urea is used as top dressing, it should be properly applied according to its characteristics to improve the effect of topdressing.
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