Yield and Nutrient Uptake of Green Gram (Vigna radiata L.) and Weeds as Influenced by Different Integrated Weed Management Practices in Western Uttar Pradesh

Abstract

The field experiment was conducted at Crop Research Centre of Sardar Vallabhbhai Patel University of Agriculture & Technology in Meerut (U.P.) during kharif 2021 to assess the performance of post-emergence application of Imazethapyr and Quizalofop-ethyl in combination with pre-emergence application of Pendimethalin on green gram (Vigna radiata L.). The experiment laid out in randomized block design with three replications and comprised of treatments Control (Weedy check) T1, Weed free T2, One hand weeding 20 DAS T3, Two hand weeding 20 and 40 DAS T4, Quizalofop-ethyl 50g a.i./ha Post-emergence (20 DAS) T5, Quizalofop-ethyl 50g a.i./ha Post-emergence (20 DAS) + one hand weeding 40 DAS T6, Imazethapyr 50g a.i./ha Post emergence (20 DAS) T7, Imazethapyr 50g a.i./ha 20 DAS + one hand weeding 40 DAS T8, Pendimethalin 1.0kg a.i./ha Pre emergence T9 and Pendimethalin 1.0kg a.i./ha Pre emergence + Imazethapyr 50g a.i./ha 20 DAS + one hand weeding 40 DAS T10. Treatments effects were evaluated in terms of weed dynamics growth and yield of green gram. The highest total NPK content and uptake by grain and straw found with weed free treatment followed by Pendimethalin 1.0kg a.i./ha Pre emergence + Imazethapyr 50g a.i./ha 20 DAS + one hand weeding 40 DAS was at par with Imazethapyr 50g a.i./ha 20 DAS + one hand weeding 40 DAS. Among the herbicides, the lowest total NPK content and uptake by weed was found with the application of Pendimethalin 1.0kg a.i./ha Pre emergence + Imazethapyr 50g a.i./ha 20 DAS + one hand weeding 40 DAS. The results revealed that treatment T2 (weed free) had the best financial return (Rs 91250 ha-1) and B:C ratio (2.72), while among the herbicides treatment T10 and T8 had the highest net financial return (Rs 92706 ha-1) and B:C ratio (3.14) respectively.