Wheat farmers are told to lower the input cost of their crops by using phosphoric fertilisers after a proper land analysis. A Punjab Agriculture Department spokesman did make it clear on Wednesday that if these farmers failed to use the fertilise during sowing, they should use two bags of diammonium phosphate and five of single super phosphate per acre in average fertile land at the time of first irrigation and one bag of diammonium phosphate and two and half bags of single super phosphate in fertile land.