Abstract

Total Dray Matter (TDM), Photosynthetically Active Radiation Intercepted (PARabs), Water Consumption (WC), Water use- (WUE), Radiation use efficiency (RUE) and the Relation between Radiation Interception and Water Consumption for Durum Wheat were investigate under different irrigation amount (D₁= 100 % ETc; D₂= 70 % ETc; D₃= 40 % ETc and D₄= pluvial) and during three growing seasons (2005-2006, 2006-2007 and 2007-2008). Results showed that, the cumulative PARabs decreased with deficit irrigation. In fact, D₁ treatment recorded the highest cumulative PAR abs and the lowest marked under D₄ treatment. Similarly, TDM and RUE were decreased with deficit irrigation. The highest RUE observed under the D₁ (from 1.32 to 1.43 g MJ^-1) and the lowest under D₄ (from 1.17 to 1.29 g MJ^-1). However WUE increased with deficit irrigation. The highest WUE were obtained under the D₄ (from 3 to 4 kg m^-3) and the lowest were observed under D₁ (from 2.8 to 3.1 kg m^-3). Significant linear relationship was found between cumulative PAR abs and cumulative water consumption with a high correlation coefficient (R²) only under the two treatments D₁ and D₂.

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