Authors:O. S. Kandasamy, H. C. Bayan, and L. Devarajan
A field study was made at Tamil Nadu Agricultural University, Coimbatore, India in a permanent fertilization experiment to assess the influence of the long-term application of manure and fertilizer schedules on changes in the weed flora and their growth in the 138th (rainfed) crop of sorghum (Sorghum bicolor (L.) Moench). The weed flora of the experimental field in the unfertilized plot at 50 days after sowing (DAS) consisted of 44.1% grasses, 26.4% sedges and 29.5% broad-leaved weeds, of which Dactyloctenium aegyptium (L.) Beauv., Cynodon dactylon, Cyperus rotundus, Digera arvensis Forsk. and Phyllanthus maderaspatensis were the most dominant weed species. Maximum weed growth was recorded in the plot treated with cattle manure. A relative grain yield of 391% over the control was recorded in the balanced fertilizer plot (combined application of N, P and K).