Position selectivity of herbicides to cotton crop

Abstract

Adequate planting depth is one of the most important factors in germination and seedling emergence, thereby ensuring a uniform stand. Thus, this study aimed to evaluate the effect of sowing depth in cotton crop (Delta Opal var.), over diuron, oxyfluorfen, alachlor, clomazone, pendimetalin, S-metalachlor, prometryne and trifluralin herbicides plant toxicity. Evaluations on crop toxicity were carried out at 7, 10, 12, 14, 17, 19, 21, 28 and 35 days after herbicide application (DAA), through EWRC scale and total dry mass at 35 DAA. No decrease in plant biomass of cotton was observed when oxyfluorfen, clomazone, pendimethalin and trifluralin herbicides were used. Dry mass decrease was observed for 0.5, 1.0, 2.0 and 3.0 cm sowing depths when diuron was applied, to 0.5, 1.0 and 3.0 cm sowing depths with the use of prometryne and for alachlor and S-metolachlor in sowing depth of 1,0 cm.