Application rate,

Mixing of small amount of farm yard manure (5 t/ha) with P and K fertilizer at the time of planting and its application in furrows economizes up to 25 % on P and K doses. Another way is to soak seed tubers in 0.2 % P solution of monoammonium phosphate containing 0.2 per cent mancozeb for 4 hours or in a solution of 1.5% of single super phosphate and 0.5 % urea and drying them in shade before planting This technique results in saving about  22-25 Kg of P/ha.