ISSN: 0041-3216

ISSN: 0041-3216 (Online), 0041-3216 (Print)
Volume 80 Number 1
Research Papers
Integrated weed management improves grain sorghum growth and yield on Vertisols. (48)
A. Ramakrishna
Field trials were conducted to investigate the potential of newly introduced herbicides, smother cropping, and integration of chemical and cultural methods for effective control of weeds in sorghum [Sorghum bicolor (L.) Moench]. All treatments reduced density and dry weights of dominant weeds, and increased sorghum grain yields compared to weed control plots. Three treatments gave grain yields comparable to the weed-free control, viz., smother cropping using cowpea or mungbean and using metolachlor or pendimethalin pre-emergent at 1.0 kg active ingredient (ai) ha-1 followed by one manual weeding at 45 days after seeding and metolachlor at 1.5 kg ai ha-1. All the weed management treatments were remunerative over the unweeded control and resulted in substantial economic gains. However, substantial additional profit over the clean-weeded check was obtained only with metolachlor pre-emergent at a rate of 1.5 kg ai ha-1, smother cropping using cowpea or mungbean, and with treatments that included chemical and manual weeding.
Keywords: Weed density; Dry matter; Herbicide combination; Vertisols; Integrated weed management; Sorghum