Field experiments were conducted at the Agricultural College and Research Institute (Killikulam), Tamil Nadu Agricultural University from September 1992 to June 1995 to optimize the herbicide dose and application techniques for cotton-based intercropping systems.283
Experiments were conducted during kharif seasons of 194-1996 to evaluate the efficacy of different organic sources to substitute inorganic potassium in rice. Application of 25 percent K as rice husk ash and 75 per cent as muriate to potash produced higher mean rice grain yield of 5666 kg ha" which was 7.32 per cent higher over 100 per cent K through inorganic fertilizer alone. Hundred percent substitution of inorganic potassic fertilizer with organics did not prove to be advantageous. Higher net return per rupee was associated with 25 per cent K as rice husk ash and 75 per cent as MOP.
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