Interaction Effects of Water Salinity and Deficit Irrigation on Growth of Grain Maize under Single row of Tape Irrigation

Document Type : Research Paper

Authors

1 Water Engineering Department, Faculty of Agriculture, Shiraz University, Shiraz, Iran

2 Water Engineering Department and Drought Research Center, Faculty of Agriculture, Shiraz University, Shiraz, Iran

Abstract

Limited water resources, the occurrence of droughts, scarcity of fresh water resources, and reduced quality of water resources, exacerbate food shortages on a day to day basis. In order to investigate the effect of different salinity levels and deficit irrigation on the growth and yield and water productivity of maize, an experiment was conducted in the research farm of the College of Agriculture, Shiraz University, Iran in 2018. The factorial experiment was performed as a randomized complete block design with three replications. Four salinity levels of irrigation water including control (0.6), 2, 3.5 and 5 dS m^(-1) and three levels of irrigation water depths including full irrigation, 75% and 50% of full irrigation were applied. Maximum seed yield, number of seeds per ear and total dry matter were observed in full irrigation treatment with salinity of 0.6 dS m^(-1). Increased salinity from 0.6 to 3.5 dS m^(-1) had no significant effect on harvest index. Increasing the stress to 50% of full irrigation caused an average of 23% increase in seed maize water productivity. Maximum dry matter water productivity of 3.06 kg m^(-3)was observed in the treatment of 50% full irrigation with salinity of 2 dS m^(-1) Therefore, in case of water shortage from the point of view of water resources management and soil salinity management, treatment of 50% full irrigation with irrigation water salinity of 2 dS m^(-1) is recommended due to higher water productivity and lower yield slope per unit increase in salinity. However, salt leaching should be considered to prevent salt accumulation in the soil.

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