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研究了浙江省施用的九种主要餅肥在土壤中分解的情况,各种餅肥都經磨碎,并通过20孔篩。实驗証明,在夏天的温度下,餅肥施入土壤后即迅速分解,它的分解最盛时期是在一星期左右,此后即迅速下降,到二星期后,即漸趋穩定。餅肥施入土壤后,铵态氮的大量發生是在一星期以內,此后即迅速降低,轉化成硝酸态氮。硝酸态氮在一星期到二星期的时間内开始大量發生,到二星期后就漸趋穩定。土壤中有效态氮总量在各个形态轉化的过程中,有顯著的減少趋势。餅肥在施入土壤前用石灰、草灰或水处理一星期,可提早土壤中有效氮的發生,其中單用水处理的效果尤其好。实驗証明,用石灰或草灰处理餅肥,使有效态氮大量損失,而用水处理則沒有这种情况。在本实驗的条件下,各种餅肥的分解速率依次为:豆餅、芝麻餅、花生餅、棉仁餅>棉籽餅、生菜餅、熟菜餅>桕餅、青餅。各种餅肥中氮素化合物转化后所產生的有效态氮总量依次为:豆餅、花生餅、芝麻餅、青餅>棉仁餅、生菜餅、棉籽餅>熟菜餅>桕餅。
Nine major cake fertilizers applied in Zhejiang Province were studied in the soil. All kinds of cake fertilizers were ground and passed through a 20-hole sieve. Experiments show that in the summer temperatures, the rapid decomposition of cake fertilizer applied to the soil, the decomposition of its heyday in a week or so, then dropped rapidly to two weeks, that is, gradually stabilized. After the application of cake fertilizer into the soil, a large number of ammonium nitrogen occurred within a week, then rapidly reduced to nitrate nitrogen. Nitrate nitrogen began to occur massively in a week to two weeks and stabilized in two weeks. The total amount of available nitrogen in soil has a significant decreasing trend in the process of each form transformation. The treatment of cake fertilizer with lime, straw ash or water for one week prior to application to the soil leads to the early availability of effective nitrogen in the soil, of which the treatment with water alone is particularly effective. Experiments show that the treatment of cake with lime or straw ash, a significant loss of available nitrogen, while water treatment is not the case. Under the experimental conditions, the decomposition rates of various cake and fat were as follows: soybean cake, sesame cake, peanut cake, cotton cake> cottonseed cake, lettuce cake, cooked cake> cake cake, green cake. The total amount of available nitrogen in the various cake fertilizers was: soybean cake, peanut cake, sesame cake, green cake> cotton cake, lettuce cake, cottonseed cake> cooked cake cake> cake cake.