| Autor: |
KWONG, K. F. NG KEE, DEVILLE, J., CAVALOT, P. C., RIVIERE, V. |
| Zdroj: |
Soil Science; March 1986, Vol. 141 Issue: 3 p195-199, 5p |
| Abstrakt: |
We studied the influence of the biological immobilization rate on the mobility and fate of fertilizer N under the humid climate of Mauritius in soil columns using (NH4)2SO4labeled with 10 atom excess 15N and sorghum as the test plant. Our results showed that biological immobilization of fertilizer N occurred rapidly and was almost complete within 2 mo after fertilization. Most (>70) of the immobilized fertilizer N remained hydrolyzable in 6 MHCl 10 mo after fertilization. Rapid biological immobilization, coupled with the fast uptake of fertilizer N by sorghum, led to less than 5 and 12 of fertilizer N being leached from the rock-free (3035 mm water added) and rocky soils (1325 mm water applied), respectively. This study draws attention to the fact that in wet tropical regions, such as Mauritius, where soil temperature is always conducive to biological immobilization and where the soil colloids fix negligible quantities of NH4, biological immobilization plays a leading role in hampering the mobility of N in soils, thereby altering the fate of fertilizer N. |
| Databáze: |
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