Vol. 11, Issue 7 (2022)

Author(s):
Jeevan N, JK Singh, MK Singh and PK Sharma

Abstract:
A field experiment was conducted during the winter (rabi) season of 2018‒19 at the Agricultural research farm, Banaras Hindu University, Varanasi to study the effect of herbicides and nitrogen levels on associated weeds and the yield of wheat. Nine weed species were commonly infested in the wheat field such as Phalaris minor, Cynodon dactylon, Anagallis arvensis, Melilotus indicus, Chenopodium album, Vicia sativa, Medicago denticulata, Solanum nigrum, and Cyperus rotundus. Among these, Cyperus rotundus and Cynodon dactylon were major weeds. Application of Sulfosulfuron (25 g ha-1) + 2, 4-DEE (750 ml ha^-1) significantly recorded the lowest weed density and biomass and higher weed control efficiency. Among nitrogen and herbicidal treatments, HW twice (30 & 60 DAS) in combination with 180 kg N ha^-1 followed by application of Sulfosulfuron (25 g ha^-1) + 2, 4-DEE (750 ml ha^-1) in combination with 180 kg N ha^-1 performed significantly with respect to reduction in density, biomass of weeds as well as increased weed control efficiency; increased SPAD value and the number of tillers ultimately enhanced the production of dry matter of wheat Whereas lowest SPAD value and the number of tillers were recorded under weedy check in combination with 120 kg N ha^-1, pinoxaden (40 ml ha^-1) + 2, 4-DEE (750 ml ha^-1) in combination with 120 kg N ha^-1 followed by pendimethalin (1000 ml ha^-1) fb 2, 4-DEE (750 ml ha^-1) in combination with 120 kg N ha^-1 and highest grain yield and straw yield obtained significantly by the application of Sulfosulfuron (25 g ha^-1) + 2, 4-DEE (750 ml ha^-1) in combination with 180 kg N ha^-1.