江西农业大学学报2001，Vol.23Issue(1)：57-61,5.
应用15N对棉田生态系统中氮素的吸收利用和去向的研究
A Study on the Absorbing Utilization and Fate of N in the Ecosystem of Cotton Field by Using 15 N
张美良 1吴建富 2刘经荣 2郭成志 3邱才飞 4占子勇5
作者信息
- 1. 江西农业大学 农学院,
- 2. 江西农业大学 国土资源与环境学院,
- 3. 江西农业大学 生物工程系,
- 4. 江西省农业科学院,
- 5. 万年县农技推广中心,
- 折叠
摘要
Abstract
15N－labeled technique was used to study the absorbing utilization and fate of N in the ecosystem of cotton field. The result showed that under the conditions of equivalent N, P and K, if biogas fertilizer was applied in combination with chemical fertilizer, it was advantageous to the shift of N to generative organs, and the increase in yield showed more prominent result than that from applying only chemical fertilizer if green manure applied in combination with chemical fertilizer, the yield was almost the same as that from applying only chemical fertilizer. The dependence of cotton plant on soil N in each treatment was lower than on fertilizer N, which was about 37.44%～43.66%，and yet the application of only chemical fertilizer was higher than the combined application of organic fertilizer and chemical fertilizer. The rates of soil N accumulation in nutritive organs in each treatment was higher than that in generative organs, but as for that of fertilizer N accumulation the sequence was just reversed. This results showed that the dependence of cotton plant on soil N in the earlier growth stages was higher, but that of fertilizer N in the later growth stages was higher, so as to provide scientific basis for applying more flowering and bolling fertilizer to cotton. The residual ratio in soil of fertilizer Nof the organic fertilizer in combination with chemical fertilizer was equivalent to 2.5～3.0 times that of only chemical fertilizer, and yet the ratio of loss N of the latter was 1.4～1.6 times that of the former, and the difference of ecological effect was also very prominent.关键词
15N/生态系统/氮素流向分类
农业科技引用本文复制引用
张美良,吴建富,刘经荣,郭成志,邱才飞,占子勇..应用15N对棉田生态系统中氮素的吸收利用和去向的研究[J].江西农业大学学报,2001,23(1):57-61,5.
