Response of rice and wheat to addition of woolen carpet wastes, sulphinated pressmud and urban digested sludge

Field experiments were conducted during rabi and kharif seasons of 1999–2002 with rice (var. Saryu-52) and wheat (var. Malviya-234) as the test j;;rops using industrial organic wastes viz. woolen carpet waste, sulphinated pressmud and urban digested sludge through integrated plant nutrient supply system. Nitrogen contents in carpet wastes, pressmud and digested sludge were 12.5, 1.05 and 1.73%, respectively. Application of 40 kg N ha⁻¹ from each of the above three organic sources in combination produced more grain yield of rice and wheat than the yield with recommended dose of NPK as chemical fertilizers. The highest grain yield of rice and wheat was recorded in the treatment receiving 33.3% nitrogen (40 kg ha⁻¹) from each organics followed by 25% nitrogen as each organics and 25% nitrogen as urea. Build up of nitrogen, phosphorus and potassium contents in soil was observed due to continuous application of organics. Maximum build up in available nitrogen content was recorded in the plots treated with carpet waste.