Abstract
ABSTRACT Effects of various herbicides applied at different rates as pre-emergence or as post-emergence were studied on symbiotic parameters, growth, productivity and nutrient accumulation in mungbean. Pre-emergence application of pendimethalin 30 EC at 0.75 kg ha−1, pendimethalin 30 EC at 0.45 kg ha−1 + hand weeding (HW) at 4 weeks after sowing (WAS) and pendimethalin 30 EC + imazethapyr 2 SL (pre-mix) at 0.45 kg ha−1 + HW at 4 WAS had no/little inhibitory effect on symbiotic parameters (nodule number, nodule dry weight and leghaemoglobin content). Among herbicide treatments, pendimethalin 30 EC at 0.45 kg ha−1 + HW proved to be the best in influencing grain yield (1574 and 1246 kg ha−1 in 2016 and 2017, respectively) and nutrient uptake by crop (130.0–150.9 kg nitrogen, 13.6–16.4 kg phosphorus and 75.9–87.9 kg potassium ha−1) followed by pendimethalin 30 EC + imazethapyr 2 SL (pre-mix) at 0.45 kg ha−1 + HW (1528 and 1177 kg ha−1 grain yield, 123.9–140.9 kg nitrogen, 12.8–15.2 kg phosphorus and 71.5–81.5 kg potassium ha−1). Application of imazethapyr at 50 or 75 g ha−1 at 15 or 25 DAS had adverse effect on symbiotic parameters, grain yield and nutrient uptake.
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