عنوان مقاله [English]
The aime of this study was to investigate interaction of different levels of irrigation, planting arrangement and plant density on yield and yield components of maize (KSC700) under subsurface drip irrigation system. The experimental design was laid out as split plot design based on randomized complete blocks with three replications. Main plots were three irrigation levels: 50, 75 and 100% of water requirement and sub plots were three plant densities: 65000, 75000 and 85000 plants per hectare and sub-sub plots were two planting patterns, one and two row plant per bed. The results showed that the highest and lowest grain yields in the first and second years of the study (with the values of 12.28 and 3.64 and 12.89 and 3.58ton/ha, respectively) were allocated to 100 and 50 of water requirement, respectively. Under plant density conditions of 65,000 plants per hectare and two-row cultivation with 100% water requirement, maximum grain yield, plant height, ear height, number of seeds per row, number of grain rows, 1000-seed weight and plant biomass were observed. Compared to 100% of water requirement, in 75% of water requirement with 25% reduction in water consumption, grain yield decreased by 21.74 and 23.73% for the first and second years, respectively.But in the 50% of water requirement, with 50% reduction in water consumption, grain yield decreased significantly (ie 70.35 and 72.22% for the first and second years). Yield and yield components (plant height, ear height, number of seeds per row, number of grain rows, 1000-seed weight and plant biomass) in all studied treatments in contrast to 100% water requirement conditions have the highest amount and in contrast to 50% of the water requirement have a minimum amount. Based on the results of this study, providing 100% of the water requirement in contrast to the planting density of 65,000 plants per hectare and two-row planting arrangement, in order to achieve the maximum yield and yield components of corn can be recommended.