Impact of commonly used pesticides on the population of beneficial soil inhabitants (enchytraeids) and yield in the rice ecosystem
2007
Karnatak, A. K. | Karnataka, D. C. | Thakur, Seema Singh | Shukla, Awdhesh
A study was conducted during Kharif season to observe the effect of some common pesticides and their combinations in rice ecosystem on the enchytraeid population and consequently on yield of rice crop. Samples from soil were collected before and after 24 hours of the pesticide application during transplanting, 30 days after transplanting (DAT), panicle initiation stage and harvesting stage of the crop. The maximum population of enchytraeid (2666.67 per m2) was observed at the time of transplanting in control plots. The minimum population (133.33 per m2) was recorded in the plots where phorate, butachlor and quinalphos were applied in combination after 24 hours of pesticide application at 30 DAT. Maximum number of tillers (15.66), maximum ear length (24.66 cm), maximum 1000 grain weight (31.20g) and Maximum yield (4926.33 kg/ha) were obtained in the plots where combination of phorate, butachlor and quinalphos were applied. Minimum number of tillers (13.66), minimum ear length (22.03 cm), minimum 1000 grain weight (28.09g) and minimum yield (4390.33 kg/ha) were recorded from control plots. Among all pesticides, caldan (cartap hydrochloride) was found to be economically sound and safest ecologically. Application of caldan in rice crop do not disturb the ecosystem as enchytraeid population was found adequately high in caldan treated plots than with other pesticides treated plots and moreover, yield was also high (4852.00 kg/ha). Application of pesticides imposed serious hazards on enchytraeid population. Combine application of more than one pesticide in the field was found to be lethal in comparison to the application of single pesticide. The pesticides used in combinations significantly increase the yield of rice crop.
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Эту запись предоставил Indian Council of Agricultural Research