Vol. 7, Issue 2 (2019)
Effect of sequential application of herbicides on nutrient uptake and economics of rice cultivation
Author(s): Bhimashankar, Shivaprasad M, Rajath HP, Girijesh GK and Dinesh Kumar M
Abstract: A field experiment was conducted during Kharif season 2016 at Zonal Agricultural and Horticultural Research Station, Mudigere to study the effect of sequential application of herbicides on nutrient uptake and economics of rice cultivation. The herbicides tested were two pre-emergent herbicides viz. Butachlor 50 EC, Bensulfuron methyl 0.6 + Pretilachlor 6 GR, five new post emergent herbicides viz. Bispyricbac sodium 10 SC, Metsulfuron methyl 20 WP, Ethoxysulfuron 15 WDG, Chlorimuron ethyl+Metsulfuron methyl 20 WP and old herbicide 2. 4 D Sodium salt 80. In addition to weed free up to 45 DAT and weedy check also included to make comparison. The experiment design was laid out in RCBD with ten treatments and three replication. Among sequential application of herbicidal treatments significantly maximum nutrients uptake by crop was recorded by Butachlor 50 EC @ 1.25 kg a.i ha-1 at 3 DAT fb Bispyribac sodium 10 SC @ 20 g a.i ha-1 at 21 DAT(88.95, 15.60 and 93.93 kg N, P and K ha-1, respectively) which is on par with nutrient uptake by the crop was recorded under weed free up to 45 DAT (97.25, 18.26 and 102.89 kg N, P and K ha-1, respectively) followed by Butachlor 50 EC @ 1.25 kg a.i ha-1 at 3 DAT fb hand weeding at 15 and 30 DAT (93.54, 16.58 and 97.63 kg N, P and K ha-1, respectively). Weedy check recorded higher nutrients (N, P and K) removal by weeds (14.46, 4.41 and 8.37 kg ha-1, respectively). The maximum gross returns were obtained by weed free up to 45 DAT (Rs. 82374 ha-1) followed by Butachlor 50 EC @ 1.25 kg a.i ha-1 at 3 DAT fb hand weeding at 15 and 30 DAT (Rs. 79404 ha-1) and Butachlor 50 EC @ 1.25 kg a.i ha-1 at 3 DAT fb Bispyribac sodium 10 SC @ 20 g a.i ha-1 at 21 DAT (Rs. 74758 ha-1) and lower gross returns were obtained in weedy check (Rs. 39217 ha-1). Higher B:C ratio recorded in sequential application of Butachlor 50 EC @ 1.25 kg a.i ha-1 at 3 DAT fb Bispyribac sodium 10 SC @ 20 g a.i ha-1 at 21 DAT (1.91) among the treatments.
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How to cite this article:
Bhimashankar, Shivaprasad M, Rajath HP, Girijesh GK, Dinesh Kumar M. Effect of sequential application of herbicides on nutrient uptake and economics of rice cultivation. Int J Chem Stud 2019;7(2):866-869.
