Effect Of Using Sub-Surface Drip Irrigation To Increasing WUE In Irrigation Of Some Crops
2007
Najafi, P., College of Agriculture, Islamic Azad University, Khorasgan Campus, Isfahan
Increasing of Water Use Efficiency (WUE) is a fundamental remedy to food production under conditions of water scarcity. The aim of this study was to evaluate the potential for water saving and yield improvements with use of ET-HS model and subsurface drip irrigation. For this purpose, four irrigation treatments were installed in a silty loam soil at an experimental farm near Isfahan city of Iran in 2000 and 2001. The treatments were included Surface drip irrigation (DI), Sub surface drip irrigation in 15 cm depth (SDI15), Sub surface drip irrigation in 30 cm depth (SDI30), Furrow irrigation (FI).These treatments were repeated for potato in two genus of Marfona and Navita (which they are ordinary genus potato in Isfahan region), tomato and eggplant. In this research, a randomized complete block design of three replications was employed for each crop. Also, in all of these treatments, crops water requirement and time irrigation scheduling were determined by ET-HS model. For this purpose, maximum and minimum temperature were measured daily and filled in the model. Based on the results of this research, SDI15 has the most efficient use of water in the production and it is substantially different from other treatments, which were about 7.84, 3.84, 13.15 and 11.64 kg/m3 in Marfona, Navita, tomato and eggplant respectively. Also, results show that the highest yield was obtained from SDI15 in Marfona, Navita and eggplant and from DI and SDI15 in tomato. A part of this increasing yield in SDI15 was related to better soil moisture in the root zone, less water runoff and less surface evaporation. Additionally, the results showed high reduction surface evaporation was obtained in SDI treatments. Finally, it can be concluded that the subsurface drip irrigation, with drippers installed at a depth of 15cm, and implementation of ET-HS model for estimating irrigation scheduling, is the best condition for Moefona, Navita, tomato and eggplant.
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