Effect of potassium salt of active phosphorus (PSAP) on growth, yield, juice quality and economics of sugarcane

Field experiments were conducted during 2016–17 and 2017–18 in spring season at the Sugarcane Research Institute, Shahjahanpur, U.P. to test the efficiency of Potassium salt of Active Phosphorus (PSAP) in improving cane yield and juice quality with the economics. Two year experiments were laid out in randomized block design with three replication. Application of PSAP through foliar sprays (5 sprays at 45, 60, 75, 90 and 105 DAP) gave significantly better results with the all three doses of PSAP viz., 10 kg, 12.50 kg and 15 kg per ha than control and when applied initial one dose at 45 DAP through drenching and rest 4 spray at 60, 75, 90 and 105 DAP. CCS percent in cane juice was found numerically better with PSAP application than control. Experimental results of two years revealed that application of PSAP @ 12.50 kg/ha through 5 foliar sprays at 45, 60, 75, 90 and 105 DAP + 100% recommended dose of P and K through soil increased number of shoots (18.54%) NMC (16.66%) and ultimately cane yield (15.46%) than that of control i.e. 100% recommended dose of P and K through soil.