Weed control in upland rice fields of Karnataka [India]
1993
Angadi, V.V. | Babalad, H.B. | Umapathy, P.N. | Radder, J.D. | Nadaf, S.K. (Agricultural Sciences Univ., Mugad, Dharwad, Karnataka (India). Agricultural Research Station)
Neither butachlor nor pendimethalin, whether alone or combined with 2,4-D, effectively controlled weeds. However, when combined with one hand weeding at 25-30 DE, [days after emergence] they controlled weeds as effectively as two hand weedings at 20 and 40 DE. When butachlor or pendimethalin were combined with one hand weeding, grain yields were on par with those of two hand weedings and greater than the treatments with no hand weeding. The cost of additional production over the nonweeded control was highest with the weed-free check, followed by butachlor + hand weeding, pendimethalin + hand weeding, and two hand weedings. The marginal benefit-to-cost ratio, however, was highest with herbicides combined with one hand weeding than with two hand weedings or in the weed-free check because of the higher weed control costs of the weedings
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