تاثير تلقين آب شور و شيرين روي عملكرد و علظت نمك در منطقه توسعه ريشه ذرت

The effect of fresh and saline water conjunction on corn yield and salt concentration in the root zone

leThere is no choice to use saline water for agriculture. Because, population is increasing and fresh water resources are limited. Of course, saline water utilization needs some management practices in the field. One of the management practices is the conjunction use of fresh and saline water. This study was conducted to investigate the effect of three conjunction methods on corn yield and salt distribution in the root zone. Therefore a complete randomized design consists of four treatments; each with three replicates (except the control treatment with one replicate) was performed in 10 lysimeters. Corn (604 varieties) was planted in all lysimeters and irrigated (five times) with fresh water (0.7 dSlm) until stemming step. From stemming step till crop harvesting, lysimeters were irrigated (seven times) with fresh and saline water, using different strategies (treatments). In the first (half-alternate) treatment lysimeters at each irrigation event, half of the irrigation water was applied with saline water (7.3 dS/m) and the other half with fresh water (0.7 dS/m). In the second (one-alternate) treatment lysimeters, irrigation was practiced with saline and fresh water alternatively (one irrigation with saline water and the next one with fresh water). In the third (blending) treatment lysimeters, irrigation was practiced with blended water (4 dS/m). In the fourth treatment (control) lysimeter, irrigation was practiced only with fresh water. The results of this study showed that in case of using saline and fresh water for irrigation, the half-alternate treatment has better efficiency (in terms of grain yield and total dry matter weight) than the two other treatments (one-alternate and bnded treatment). Water use efficiencies were estimated to be 0.82, 0.65, 0.56 and 0.58 kg/m3 for control, half-alternate, one-alternate and blended treatments, respecti"ely. Also, the results of this study showed lower ECe in the half-alternate lysimeters at 25 and 50 cm depth, compared to one-alternate and blended lysimeters.