Effect of Irrigation Water Salinity on yield and yield components corn under TTape Irrigation System

The use of unconventional water, including salt water for irrigation is an unavoidable, due to the increasing demand for water, especially in arid and semi-arid. To determine effects of irrigation water salinity on corn yield and its yield components, 4 treatments of saline water with salinity of 2, 6, 9 and 12 ds/m in randomized complete block design (RCB) was conducted in Sabzevar region in the 2012-13 season. Results showed that increasing of water saline decreased corn yield and its yield components such as plant’s height, dry weight, leaf area, maize diameter, number of rows on ear, productivity, weight of 100 grain and number of grains, significantly. For every one unit increase in salinity, height, biomass and leaf area decreased 1.94, 6.16 and 1.85%, respectively. Salinity threshold (a) and line slope (b) was obtained 1.7 ds m-1 and 9.3%, respectively. Low salinity threshold and high line slope indicated that corn is very sensitivity to saline.