Effect of irrigation systems, amounts of irrigation water and mulching on corn yield, water use efficiency and net profit

Two field experiments were conducted in a sandy soil to study the effects of two irrigation systems [drip (DIS) and sprinkler (SIS)], three amounts of irrigation water (AIW) [I100 = 100%, I85 = 85% and I70 = 70% of the crop evapotranspiration] and five mulching [farmyard manure (FYM)] treatments [0 ton ha−1 (FYM0), 10 ton ha−1 spread on the soil surface or incorporated with surface layer (FYM10s or FYM10m, respectively) and 20 ton ha−1 spread on the soil surface or incorporated with surface layer (FYM20s or FYM20m, respectively)] on corn yield, water use efficiency (WUE) and net profit.