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各种铵态氮肥在土壤中都以铵离子状态存在,惟液氨以气体氨这种高度活性状态参与反应,井极易从土壤逸失,在液氨直接施肥工作中,研究土壤对氨的吸持,及防止氨的挥发损失有其重要意义.自1977年来,我们在北京开展液氨直接施肥的研究,试验几种主要作物的肥效、施肥量、施肥深度等.初步证明液氨作为一种高浓度、低成本的氮素化肥,在我国很有推广价值.在进行大田肥效试验的同时,我们还进行了液氨挥发量与土壤吸持量的实验室测定,以期为制定合理的液氮施肥技术提供科学依据.
Various ammonium nitrogen fertilizers exist in the soil as ammonium ion. However, liquid ammonia participates in the reaction with the highly active state of gaseous ammonia and can easily escape from the soil. In the direct liquid nitrogen fertilization, Holding, and preventing the loss of ammonia is of great significance since 1977, we conducted direct liquid ammonia fertilizer research in Beijing, to test the effectiveness of several major crops, fertilizer, fertilizer depth, etc. Preliminary evidence of liquid ammonia as a High-concentration, low-cost nitrogen fertilizer has great promotion value in our country.While conducting field fertilizer test, we also conducted a laboratory measurement of ammonia volatilization and soil holding capacity, in order to develop a reasonable liquid nitrogen Fertilization technology to provide a scientific basis.