Abstract
According to recent droughts and severe water, use of subsurface drip irrigation for sugarcane production was very important approach in Iran. The experiment was conducted in a split-plot design, a basic design of complete random block with two factors and three replications. The first factor composed of 50 and 60 cm space in the main plots. The second factor includes different depths of water pipe installation (15, 20 and 30-cm) along with the conventional irrigation method (furrow irrigation). The results of analysis of variance of the effect of different treatments on qualitative traits showed that in both experiment periods, simple and interaction, effects of these treatments on all quality at traits (Pol%, Brix%, Purity% and R. S%) were non-significant at the p<0.01. The highest sugarcane and sugar yield and highest number of stalks obtained in 50-cm space of the drippers and 20-cm depth of drippers. On average, in two years of experiment, in 50-cm space of the drippers and 20-cm depth of the drippers higher WP of produced sugarcane and sugar was 6.6 and 0.73 kg.m-3, respectively. It was about 47 and 43 percent higher than the average of WP per sugarcane and sugar of the control treatment, respectively. Comparing results of qualitative and quantitative yields of subsurface drip irrigation and conventional irrigation showed that most quantitative and qualitative traits of subsurface drip irrigation were higher than the furrow irrigation. Also, the results showed that moisture distribution is similar in both growth stages of sugarcane (Plant and Ratoon1), so that the moisture around the drippers and width of ridge to a depth of 80-cm (the depth of activity of sugarcane root) was appropriate and shape of moisture bulb is oval under the drippers. According to the results of two years and considering other experiment conditions, for regions with similar characteristics to this experiment, 20-cm depth for discharge pipe and 50-cm space of emitters on the lateral pipe are suggested.
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