| Autor: |
Hegazi, N., Monib, M., Belal, M., Amer, H., Farag, R. |
| Zdroj: |
Archives of Environmental Contamination & Toxicology; Sep1979, Vol. 8 Issue 5, p629-635, 7p |
| Abstrakt: |
The effect of the application of a group of pesticides (Temik, Stomp, Dinoseb, Nata, Dursban, and Simazine 1 on N-ase activity in Giza clay-loam soil under maize cultivation was investigated in the presence of 1 to 2% glucose or malate amendments. Field concentrations of all pesticides showed different inhibitory effects, and the effects increased with increased doses (10-and 100-fold) and incubation period (11 days). Temik and Stomp more seriously inhibited N-ase activity than Dinoseb and Nata; Simazine and Dursban had the lowest effect. The effect of the field dose of Stomp on the patterns of N-ase activity and development of N-fixing spirilla and azotobacters in soil amended with glucose or malate was followed for a period of one month. Inhibitory effects on N-ase activity as well as numbers of asymbiotic N-fixers were marked during the first week of incubation, followed by a step wise recovery to normal levels by the end of the experiment. The deleterious effect of the tested pesticides was repeated in pure cultures of certain isolates of N-fixing spirilla and azotobacters. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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