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The method of straw ammoniation can be divided into liquid ammonia ammoniation, urea ammoniation, ammonium hydrogencarbonate ammoniation and ammonia ammonia amination according to different ammonia sources. Among them, liquid ammoniation and urea ammoniation are more effective. it is good.
Liquid ammonia ammoniated liquid ammonia is also called anhydrous ammonia, containing 82.3% nitrogen. The usual amount is 3% of the dry weight of straw, which is the most economical source of ammonia, and the nitriding effect is also the best. Ammonia is a gas at normal temperature and pressure, and it needs to be in a pressure vessel to maintain a liquid state. Therefore, liquid ammonia requires high-pressure container storage and transportation (ammonia tank and ammonia tank truck, etc.), and the one-time investment is large. In addition, liquid ammonia is toxic and explosive, and is generally not suitable for individual farmers.
Urea ammoniated urea contains 46.6% nitrogen. Decomposed into ammonia and carbon dioxide under the action of suitable temperature and urease. The ammonia produced can ammoniaize the straw. The recommended amount of urea is 4% to 5% by weight of the dry matter of the straw. Urea is convenient for storage and transportation. No special equipment is needed for ammoniation. The requirements for sealing conditions are not as strict as liquid ammonia. It is an ammonia source commonly used in China, and the ammoniation effect is second only to liquid ammonia.
Using urea as the source of ammonia, consider the rate at which urea is decomposed into ammonia. The higher the temperature, the faster the urea is decomposed into ammonia and should be used in warm areas or seasons. It is usually necessary to accelerate the decomposition of urea. It is best to add urease-rich things such as bean cake powder during the ammoniation process. The urease content of corn stover is higher than other straws and may not be supplemented with urease.
Ammonium bicarbonate ammoniated ammonium bicarbonate contains 15% to 17% of nitrogen and decomposes into ammonia, carbon dioxide and water under suitable temperature conditions. According to the nitrogen content and dosage of liquid ammonia, the suitable amount of ammonium bicarbonate is 14%~19% of the dry matter weight of straw. The decomposition of ammonium bicarbonate is affected by temperature, and the decomposition is incomplete under low temperature conditions, and the ammoniation effect is not ideal.
Ammonia ammonia Ammonia water is an aqueous solution of ammonia. The concentration of ammonia water is not equal, usually 20%, and the suitable amount is 12% of the dry matter weight of straw. Because ammonia has low nitrogen content and large transportation volume, it is suitable for application near chemical fertilizer plants.
Liquid ammonia ammoniated liquid ammonia is also called anhydrous ammonia, containing 82.3% nitrogen. The usual amount is 3% of the dry weight of straw, which is the most economical source of ammonia, and the nitriding effect is also the best. Ammonia is a gas at normal temperature and pressure, and it needs to be in a pressure vessel to maintain a liquid state. Therefore, liquid ammonia requires high-pressure container storage and transportation (ammonia tank and ammonia tank truck, etc.), and the one-time investment is large. In addition, liquid ammonia is toxic and explosive, and is generally not suitable for individual farmers.
Urea ammoniated urea contains 46.6% nitrogen. Decomposed into ammonia and carbon dioxide under the action of suitable temperature and urease. The ammonia produced can ammoniaize the straw. The recommended amount of urea is 4% to 5% by weight of the dry matter of the straw. Urea is convenient for storage and transportation. No special equipment is needed for ammoniation. The requirements for sealing conditions are not as strict as liquid ammonia. It is an ammonia source commonly used in China, and the ammoniation effect is second only to liquid ammonia.
Using urea as the source of ammonia, consider the rate at which urea is decomposed into ammonia. The higher the temperature, the faster the urea is decomposed into ammonia and should be used in warm areas or seasons. It is usually necessary to accelerate the decomposition of urea. It is best to add urease-rich things such as bean cake powder during the ammoniation process. The urease content of corn stover is higher than other straws and may not be supplemented with urease.
Ammonium bicarbonate ammoniated ammonium bicarbonate contains 15% to 17% of nitrogen and decomposes into ammonia, carbon dioxide and water under suitable temperature conditions. According to the nitrogen content and dosage of liquid ammonia, the suitable amount of ammonium bicarbonate is 14%~19% of the dry matter weight of straw. The decomposition of ammonium bicarbonate is affected by temperature, and the decomposition is incomplete under low temperature conditions, and the ammoniation effect is not ideal.
Ammonia ammonia Ammonia water is an aqueous solution of ammonia. The concentration of ammonia water is not equal, usually 20%, and the suitable amount is 12% of the dry matter weight of straw. Because ammonia has low nitrogen content and large transportation volume, it is suitable for application near chemical fertilizer plants.
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