Authors
1 Assistant Professor, Water Engineering Department, Faculty of Agriculture, Shahid-Bahonar University of Kerman, Kerman, Iran
2 Islamic Azad University Kerman Branch, Kerman, Iran
Abstract
In order to investigate the effect of deficit irrigation and position patterns tube to increase water use efficiency of cotton, a field experiment was carried out during 2009 and 2010 growing season at experimental farm of Orzoueyeh Agriculture and Natural Resources Research Center in Kerman province. The treatments were laid out in strip split plot a Randomized Complete Block Design with three replications. The treatments were comprised of three levels of irrigation including 100, 80, 60 percent of crop water requirement in main plot and sub plot consisted of two irrigation systems (surface drip irrigation system (S1), subsurface drip irrigation system (S2)) and two tape position patterns (conventional (L1) and alternative (L2)). The results showed that In comparison with 100 percent of crop water requirement, 80 percent of water requirement caused parsimony of water usage equal 1300 m3 ha-1, and yield, WUE, number of bolls per plant and bolls weight increased 8.5%, 4%, 10% and 2.5% respectively. Also I3 compared with I1 savin about 3400 m3 ha-1 of irrigation water, and increase WUE was 8% but yield loss, number of bolls per plant and bolls weight decreased 18%, 25% and 18% respectively. Considering the results obtained in this study in the light of water saving as the main object in deficit irrigation and water use efficiency (WUE) for cotton cultivation in Orzoueyeh, the 80% of crop water requirement on subsurface drip irrigation is preferred.
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