Two field experiments were conducted at CCS HAU Regional Research Station, Karnal, Haryana, India during 2004-2007 on the plant-ratoon-plant sequence of sugarcane crops in and during 2008-2010 on plant-ratoon in sequence. In both the experiments, the application of NPK fertilizer increased the cane yield of plant (3.8-7.9 %) and ratoon crops (4.9-6.2 %) of sugarcane, over NP treatment. Cane yields produced with the application of farm yard manure (FYM) + N 1/2 P, press-mud (PM)/press-mud compost (PMC) + N 1/2 P, FYM + NP, PM/PMC + NP, green manure (GM) + NP were at par with application of NPK, respectively (cane yields produced with NPK were 83.0, 77.9 and 85.7 t/ha for plant-ratoon-plant crops, respectively and 76.3 and 90.4 t/ha for plant-ratoon crop, respectively). These treatments produced higher cane yield of plant and ratoon crop than NP fertilizers alone. The application of FYM + NPK or PM/PMC + NPK or GM + NPK produced significantly higher cane yield (3-5 % of plant and 5-8 % of ratoon crops) than the application of NPK alone. In both the experiments, the application of NPK fertilizer increased the CCS% of plant and ratoon crops of sugarcane over NP treatment. The application of organic manure (FYM or PM/PMC or GM) + N 1/2 P or NP or NPK increased the soil organic carbon (OC%) over NPK (from 0.39 up to 0.52 % in first experiment and 0.44 up to 0.48 % in second experiment). The application of NPK increased the available K in the soil over NP (from 180 up to 194 kg/ha in the first experiment and 142 to 150 kg/ha in second experiment). The application of organic manure (FYM or PM at 12.5 t/ha) + NPK substantially increased the available K in the soil (from 180 up to 200 kg/ha in the first experiment and 142 up to 154 kg/ha in second experiment).
