EFFECT OF PESTICIDE (CHLORYPYRIPHOS) ON THE GROWTH OF NITRIFYING BACTERIA (Nitrosomonas AND .....

The influence of pesticides on the growth of two soil nitrifying bacteria species, Nitrosomonas and Nitrobacter, was explored in this study. The bacteria were discovered from soil samples collected at Bingham University in the Karu local government area of Nigeria's Nassarawa State. Manniol Yeast Extract Agar was used to cultivate the soil microorganisms (MYEA). Based on their shape and chemical properties, the bacteria isolates were identified and classified. After four (4) days of isolation, the bacteria's growth count indicated a significant increase. The growth of Nitrobacter count obtained from MYEA varied from 24 to 97 (x105) cfu/g, while Nitrosomonas count obtained from MYEA ranged from 23 to 102 (x105) cfu/g. For Nitrosomonas species, there was an increase in bacteria growth at the control level and a decrease in bacteria growth at concentration levels of 20% to 100% within 120 hours of observation. F_ cal 0.830 was higher than F-tab 0.05, indicating that Nitrobacter species were present. The value of F_ cal 1.360 was higher than the value of f-tab 0.05. For both the Nitrosomonas and Nitrobacter species, the F- cal value is bigger than the F- tab value. The null hypothesis is disproved, and the alternate hypothesis is accepted. This demonstrates that under high pesticide concentrations, nitrifying bacteria cannot survive or develop. It is therefore critical to test herbicides before to application to determine their toxicity to soil microbes.

Please see the link :- https://www.ikprress.org/index.php/AJOPSS/article/view/7202