Bio efficacy of herbicides in relation to irrigation schedules in normal sown wheat

Abstract

A field experiment was carried out for two consecutive years (2017-18 and 2018-19) during winter (Rabi) season at students Instructional Farm of Chandra Shekhar Azad University of Agriculture and Technology, Kanpur. (U.P). The main objective of the experiment was to find out the economically feasible irrigation schedule and weed management practice for obtaining maximum net monetary returns from timely sown wheat. The experiment was laid out in Split Plot Design and replicated four times having 32 treatment combinations. The wheat variety K-1006 was sown at row distance of 22.5 cm by opening slits with seed-drill machine. Treatments consisted of four irrigation schedule viz. irrigation at CRI and active tillering stage (I1), irrigation at CRI + jointing + booting (I2), CRI + active tillering + booting + flowering stage (I3) and irrigation at CRI + jointing + booting + flowering + milking stage (I4) were assigned to main plots and weed management practices viz. W1-weedy check, W2-two hand weeding at 20 and 40 DAS, W3-sulfosulfuron at25 g ha-1 at 35 DAS, W4- pendimethalin (pre-em) fb WCPL-15at400 g ha-1 at 35 DAS, W5- broadway (carfentrazone ethyl 20% + sulfosulfuron 25%WG) at 100 g a.i. ha-1at 35 DAS, W6- halauxafen + penxasulam 23.5% at 75 g a.i. ha-1 at 35 DAS, W7- halauxafen - methyl 1.21% w/w + fluroxypyr at at 35 DAS and W8- clodinafop- propargyl 15% + metsulfuron 1% at 400 g a.i. ha-1 35 DAS were allocated to sub plots. The experimental crop was sown in lines 22.5 cm apart using 100 kg ha-1 seed by opening slits with seed-drill machine. A uniform recommended dose of 150 kg N, 75 kg P2O5 and 75 kg K2O ha-1 was applied to crop through urea, DAP and murate of potash, respectively. Half amount of nitrogen and full dose of phosphorus and potash were applied as basal at the time of sowing, ¼ part of nitrogen was top dressed after first irrigation and remaining ¼ part of nitrogen was top dress at spike initiation stage. Weed management practices and irrigations were applied as per treatment. Results indicated that