Effect of temperature and moisture on the influence of afalon and gramoxone on the soil microbial biomass
1992
Nowak, A. (Akademia Rolnicza, Szczecin (Poland). Katedra Mikrobiologii Rolnej) | Michalcewicz, W.
The effect of temperature and soil moisture content on the influence of Afalon, Gramoxone, and Afalon + Gramoxone mixtures on the amount of soil microbial biomass was studied. The herbicides were applied at dosages of 1, 10, 100 and 1000 mg/kg. The soil was incubated at temperatures of 10, 20, 30 and 40 degrees C, and at water contents of 10, 50, and 90 % max. water capacity. After 0, 7, 14, and 21 days the amount of microbial biomass in soil was determined, using the physiological method of ANDERSON and DOMSCH (SIR method). The results show the inhibitory effect of Afalon on the microbial biomass, and stimulation caused by lower dosages of Gramoxone and Afalon + Gramoxone combinations. The inhibitory effect of all herbicides increased with increasing dosages. The inhibitory effect of the herbicides is significantly different at the different temperature and moisture conditions. It increases with increasing difference of the values of these parameters from optimum. The influence of each herbicide, or their combinations, on the amount of microbial biomass depends in a different manner on soil temperature and moisture content
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