Effect of different organic materials with fly ash in integrated plant nutrient system for groundnut (Arachis hypogaea)

An investigation was carried out during the dry season (February - May) of 1996 and 1997 at the Indian Institute of Technology, Kharagpur, to study the effect of paper factory sludge and fly ash on groundnut (Arachis hypogaea L.) and to find out their suitable time of incorporation in acid lateritic soils. Paper factory sludge along with fly ash and chemical fertilizers increased the dry matter accumulation, leaf area index and nodule number/plant compared to farmyard manure and their combination along with fly ash and chemical fertilizers. The beneficial effect was also recorded in yield attributes, yield, oil content in kernel, nutrient uptake and chemical properties of soil. Their incorporation at 15 days before sowing or at sowing was more advantageous than that at 30 days before sowing.