Journal of Taiwan Agricultural Research

Author:Yu-Wen Lin, Tsang-Shen Liu and Chung-Ho Wang*

Abstract:

    Nitrogen mineralization characteristics of nine commercial / farm-produced organic materials were investigated in this study by incubation-leaching method. The accumulative mineralized N (AMN) released during 2, 4, 6, and 8 weeks incubation period was significantly negative correlated with the naperian logarithm of C/N value of the organic materials. Nine materials were divided into two groups according to their mineralization characteristic curves of eight-week incubation. Group 1 (hog manure ?, hog manure II, chicken manure, sawdust compost, and bagasse compost), continual release of mineral N started at the 1st week and reached the first AMN peak at the 1st or the 2nd week, and then was getting slow in the subsequent 1-5 weeks. After the slowing down period, hog manure I and chicken manure still released mineral N after incubation of the 2th and the 6th week, respectively. But on the contrary, hog manure II, saw- dust compost and bagasse compost presented N immobilization after the 1th to the 4th weeks. As to group 2 of cattle manure, rice straw, sesbania, and pure bagasse, except for the first one to two days with N mineralization appeared in some material, all presented N immobilization in the eight-week incubation. Mineralization characteristic curve after the 8th week indicated AMN of hog manure I went on increasing within 36 weeks, and the second AMN peak of chicken manure reached at the 24th week. While in cattle manure and rice straw, N immobilization continually took place, but N mineralization of cattle started until after 28 weeks. N immobilization of rice-straw lasted even after incubation test.

Key words:Organic material, Nitrogen mineralization characeristics, Accumulative mineralized N, C/N

Download: PDF Links