Sorghum is among the most important forages used in arid and semi-arid regions of south-eastern Iran, but its growth and yield are often constrained by water deficit and poor productivity of sandy soil. Irrigation water is becoming scarcer and more costly. Application of some materials such as Superabsorbent A200 polymer (SAP) in soil can increase soil water storage capacity and increase water use efficiency. The objective of present study was to investigate the effect of irrigation regime and different levels of SAP on dry matter and some physiological traits of sorghum×sudan grass in Zahedan, Iran during 2013. The experimental design was a split-plot with two factors including four irrigation regimes consisting irrigated with 40%, 60%, 80% and 100% crop evapotranspiration (ETc) as main plots and four amounts of SAP (0, 60, 120 and 180 kg ha-1) as subplots in a completely randomized block design with three replications. The results indicated that the effect of irrigation and SAP in all traits were significant (P<0.0001) and also, revealed that the interaction effects of two factors were significant (P<0.01) except leaf area duration and relative water content traits. The results showed that water stress decreased chlorophyll index, leaf area duration, leaf area index, relative water content significantly, while the application of SAP decreased the negative effect of deficit irrigation. According to the results it could be concluded that supplying 80% water requirement the plant and 60 kg ha-1 SAP produced a desirable dry matter.
Keywords: Chlorophyll index, Leaf area duration, Leaf area index, Relative water content.
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