Abstract

A field experiment was conducted during kharif seasons of 2012 and 2014 at C. S. Azad University of Agriculture & Technology, Kanpur to study the effect of different uses of herbicides on growth and yield attributes and seed cotton yield in hirsutum cotton. Data indicated that application of pendimethalin @ 1 kg a. i./ha as PE+quizalofopethyl @ 50 g a. i./ha 30 DAS+one hoeing 50 DAS and weed free plot improved significantly all the growth and yield attributing characters over weedy check. Weed free check plot produced significantly highest seed cotton yield (1311 kg/ha) and lint yield (442 kg/ha) than weedy check. Herbicidal application of pendimethalin @ 1 kg a. i./ha as PE+Quizalofopethyl @ 50 g a. i./ha 30 DAS+one hoeing 50 DAS was found next best treatment of producing significantly higher seed cotton yield (1157 kg/ha) and lint yield (357 kg/ha) than weedy check (514 kg/ha) and (174 kg/ha) seed cotton yield and lint yield, respectively. Lowest dry weight (3.98 g/m2) of weeds was recorded with direct spray of glyphosate 45% SL @ 1 kg a. i./ha. Higher weed control efficiency (83.3%) was recorded with direct spray of glyphosate 45% SL @ 1 kg a. i./ha followed by pendimethalin @ 1 kg a. i./ha as PE+quizalofopethyl @ 50 g a. i./ha 30 DAS+one hoeing 50 DAS (63.5%). Highest net returns (Rs. 19824/ha) and B: C ratio (1.56) were obtained with herbicidal application of pendimethalin @ 1 kg a. i./ha as PE+quizalofopethyl @ 50 g a. i./ha 30 DAS+one hoeing 50 DAS.