International Journal of Chemical Studies
Vol. 6, Issue 1 (2018)
Leaching losses of primary nutrients, organophosphate based and carbamate based insecticides in various soil types of Konkan region under rice crop
Author(s): Borkar VS, Gokhale NB, Dhopavkar RV, Sawant PS, Khobragade NH and More SS
Abstract: The research was conducted on the “LEACHING LOSSES OF PRIMARY NUTRIENTS, Organophosphate Based And Carbamate Based Insecticides IN VARIOUS SOIL TYPES OF KONKAN REGION UNDER RICE CROP” at Dr.B.S.K.K.V., Dapoli, Dist. Ratnagiri. The experiments was conducted with three soil types dominant in Konkan region viz., Lateritic, Medium black and Coastal saline soil which included the RDF along with two sources of pesticides (Carbofuron and Phorate) with rice (var. Sahyandri-4). Another experiment replicated thrice to study the movement behavior of pesticides at the different depths of soil profile at 0-30, 30-60 and 60-90 cms was determined. The leaching loss of pesticides through the column was also quantified. Among the primary nutrients (N, P and K) the leaching losses of phosphorous in all soil types under study was found to be negligible as compared to nitrogen and potassium indicating immobility. The overall data regarding to the leaching losses of the N, P and pesticides from soil under rice crop as influences by various treatments showed trend viz. Lateritic soil > Medium black soil > Coastal saline soil and study indicated that these parameters were significantly affected due to pesticides treatments. However in case of potassium leaching losses from soil under rice crop as influences by various treatments showed trend Coastal saline soil > Lateritic soil > Medium black soil and study indicated that these parameters were significantly affected due to pesticides treatments. Among the two pesticides when compared, the leaching losses were higher in Carbofuron treatments (1.84 to 7.59 percent) than Phorate (0.63 to 5.91 percent) irrespective of soil type. The results of the leaching column experiments indicated that, the maximum pesticides leaching loss through percolates occurred in Lateritic soil and minimum in Coastal saline soil. Among the two pesticides studied, the losses of Carbofuron were found more than Phorate due to its higher solubility in water. The pesticides residue in surface (0-30cm) soil of leaching column was found maximum upto 30thday sampling thereafter it gradually decreased due to degradation and leaching losses. The vertical downward movement of pesticides across the layers was seen maximum in Lateritic soil and least in the Coastal saline soil. Carbofuran moved faster through the layer than Phorate.
Pages: 243-251 | 604 Views 5 Downloads
How to cite this article:
Borkar VS, Gokhale NB, Dhopavkar RV, Sawant PS, Khobragade NH, More SS. Leaching losses of primary nutrients, organophosphate based and carbamate based insecticides in various soil types of Konkan region under rice crop. Int J Chem Stud 2018;6(1):243-251.