Effect of the Insecticide Carbaryl 10D on the Number and Activity of Fungi and Bacteria in Soil

	Effect of the Insecticide Carbaryl 10D on the Number and Activity of Fungi and Bacteria in Soil
JOURNAL OF THI-QAR SCIENCE
Article 1, Volume 2, Issue 4, 2011, Pages 3-15
Abstract
A field and laboratories studies were carried out through 2008/2009 season to determine the effect of the insecticide Carbaryl 10D (which was spraying on palms to protect from Batrachedra amydrala) on the number and activity of fungi and bacteria in soil. The first study was conducted in seven palm orchards in Soq-Elshyookh / Thi-qar government by spraying 15 kgs from carbaryl 10D in two split application to six of these orchards. After 3 and 16 days, the number of fungi and bacteria in soil were determined and compared with their numbers before spraying . The insecticide didn't affect fungi and bacteria numbers just in one state from six through the first three days and in the later days the numbers increased slightly. In the second and third study, the insecticide was mixed with soil in the levels ( 0 , 20 , 40 , 60 , 80 and 100 ) mg. kg -1 . A significant decrease was happened in the numbers of fungi and bacteria which reached 26 and 18.9 % respectively when using the insecticide in level 100 ) mg. kg -1 . Also there was a significant decrease in the microbial activity in the first days of incubation which was determined by measuring the quantity of CO2 released , the decreasing percentage was 14 and 21.9 % respectively when using the insecticide in level 100 ) mg. kg -1 .After the eighth day of incubation , the numbers of fungi and bacteria and their activity began to increase .

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