Author(s): Abd El-Raheem, R. El-Shanshoury and Mostafa A. Al-Sayed
Article publication date: 1988-08-01
Vol. 6 No. 2 (yearly), pp. 245-253.
150
Keywords
terbutryn, herbicide, bacteria
Abstract
Terbutryn at concentrations of 10, 30 and 100 µg/g soil showed a significant stimulatory effect on the population of total bacteria, azotobacter, actinomycetes and fungi over those of the non-treated soil samples. The increases in the microbial populations were in proportion to the level of terbutryn, and persisted for at least 2 months. In liquid media, these levels caused substantial increase in the biosynthesis of indole-3-acetic acid by streptomycetes, fungi and azotobacter. The sensitivity of these organisms to the applied herbicide is a specific feature depending on the strain variation and the dose of the herbicide. The maximal biosynthesis of indole-3-acetic acid was 1.6, 2.8 and 8.1 fold, respectively, over that in the herbicide-free media.