The application of nitrogen fertilizer "is not suitable for ten"
October 16 18:02:06, 2018
First, ammonium nitrogen fertilizer should not be mixed with alkaline fertilizers. Because mixing will produce ammonia volatilization, reduce fertilizer effect. Commonly used nitrogenous nitrogenous fertilizers are ammonium bicarbonate, ammonium sulfate, ammonium nitrate, ammonium acid, ammonium nitrate, etc. Basic fertilizers include calcium magnesium fertilizer, ash, lime, and the like. Second, nitrate nitrogen fertilizer should not be mixed with organic fertilizer. Organic manure contains more organic matter. Nitrate and nitrogenous fertilizer will cause nitrification under the action of denitrifying bacteria and lose nitrogen. The commonly used nitrate nitrogen fertilizers include ammonium nitrate, sodium nitrate, and calcium ammonium nitrate. Third, nitrate nitrogen fertilizer should not be applied in paddy fields. Nitrate nitrogen fertilizer is easily decomposed by denitrifying bacteria to cause loss of nitrogen under anaerobic conditions. The separated silver nitrate is lost along with water and reduces fertilizer efficiency. Dry land should also be prohibited from pouring heavy water before and after heavy rain. Fourth, urea should not be poured. Because after applying the soil, urea will be hydrolyzed into ammonium bicarbonate by the action of soil microorganisms, and then it will decompose and volatilize ammonia. Fifth, urea should not adhere to the seeds. Urea contains a small amount of biuret to affect seed germination, and when the concentration is too high, it will poison the seed. When using urea as a seed fertilizer, do not directly touch the seeds or control the amount of urea. Each acre should not exceed 2.5 kg. Sixth, urea as top dressing concentration should not be too high. As a foliar fertilizer, the urea effect is indeed good, but blindly increasing the dosage will be counterproductive. Appropriate application concentration is 0.8--1% for grain and cotton crops, and 0.4--0.6% for efficient fruit and vegetable crops. Seventh, ammonium bicarbonate should not be applied on the above table for too long. Do not apply shallowly, the nature of ammonium bicarbonate is not stable and should be covered immediately after application. Eighth, ammonium sulfate is not suitable for long-term application. Ammonium sulfate is an acidic fertilizer. Long-term application will increase the acidity of the soil and damage the soil structure. Applied at. In calcareous soils, sulfate ions bind the soil with calcium carbonate. Therefore, alternate with other nitrogen fertilizers. Nine is the amount of ammonium sulfate should not be applied in the paddy field. Because it will fall into an oxygen-deficient reducing layer after application, sulfate is reduced to hydrogen sulfide, forming black ferrous sulfate around the roots of rice, forming black roots and losing nutrients. Tenth, ammonium nitrate should not be applied to bogey nitrogen crops. Application of side effects such as Ganzi, beets, potatoes, citrus, grapes, tobacco and other bogey on nitrogen crops will cause crop physiology to be destroyed or even die, and the harvest quality will decline.