EFFECT OF PRECEDING RICE HERBICIDE RESIDUE ON WEED, GROWTH AND YIELD OF SUMMER BLACKGRAM IN RICE-BHENDI-BLACKGRAM SEQUENCE
Field experiment was carried out at Agricultural College and Research Institute, Tamil Nadu Agricultural University, Madurai during summer season, 2017. To find out preceding rice herbicide residual effect on weed, growth, yield of summer blackgramin rice-bhendi-blackgram sequence. Grasses were the dominant weed species throughout crop season followed by sedges and broad leaved weeds at 20 DAS, whereas except grasses other weeds were vice versa at 60 DAS.Residual effect of preceding rice crop herbicide residue and their weed control treatments exerted significant differences in grasses, sedges and broad leave weeds density and weed dry weight of blackgram at 20 DAS. Weed free check was recorded significantly higher LAI of 3.90 which was comparable with butachlor at 1.25 kg/ha on 3 DAT fb hand weeding on 40 DAT + hand weeding twice at 20 and 40 DAS.The highest seed yield (8.42q/ha) recorded under weed free check. Among the weed control treatments, residual effect of butachlor at 1.25 kg/ha on 3 DAT fb hand weeding on 40 DAT + hand weeding twice at 20 and 40 DAS registered higher seed and haulm yield of 32.1, 28.2% and 54.2, 53.2% respectively.
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