Effect of Soil Residual Atraziae on Succeeding Mung Crop

The study carried out to know the persistance of atrazine (2 chloro-4-ethylaraino-6-isopropylamino-l, 3, 5-S triazine and its effects on succeeding mung (Var. PS-16)a general rotation crop in Kharif after rainfed rabi sorghum on which graded doses of atrazine i.e., o(H₀), 0.5 (H) 1.0(H₂), 1.5(H₂), 2.0(H₄) kg a.i./ba as pre emergence alone and pre emergence doses each along with uniform post emergence application of 0.5 kg a.i/ha i.e. 0.5 + 0.5 (H_s), 1.0 + 0.5 (H₆), 1.5 + 0.5 (H₇), 2.0 + 0.5 (H₈) kg a.i./ha were tried earlier. In the same sorghum experimental plots the residual mung study was conducted without disturbing the soil and the laybout by working cultivator twice after collecting the soil samples lor residual analysis. The mung seed was sown with seed dr 11 at 30 cm apart in the first week of June in the two consecutive Kharif seasons of 1982 and 1983 in black clay loamy soil of college of Agriculture, M. A. U., Parbhani, in Randomized Block Design with six replications. The study indicated that the atrazine residues persisted till next kharif seasons and the concentration showed a positive relation with the doses earlier applied. H gher residual concentrations depressed the stand or emergence of the plants at 4th day. The mortality study revealed that the mung plants in due course of time, absorb atrazine residues and built up concentration to the lethal level in all treatments irrespective of the level and method of application. Hence, it was advised to avoid mung crop with a tolerant crop of maize sorghum or millet.