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Effects of Phosphorus and Water Supply on Yield, Transpirational Water-Use Efficiency, and Carbon Isotope Discrimination of Pearl Millet

^a Institute of Plant Nutrition and Soil Science, Univ. of Kiel, Olshausenstr. 40, 24118 Kiel, Germany
^b Oregon State Univ., Columbia Basin Agric. Res. Center, P.O. 370, Pendleton, OR 97801 USA

View larger version (14K): [in a new window]   Fig. 1 Cumulative water consumption (L) of pot grown pearl millet from 28 DAS to date of harvest as affected by low (-) and high (+) supply of phosphate and water. Results are pooled for two varieties

View larger version (18K): [in a new window]   Fig. 2 Relationship between transpirational water-use efficiency and carbon-isotope discrimination based on shoot dry matter (WUES) and total biomass (WUESR) as affected by low (-) and high (+) supply of phosphate and water. Discrimination () is calculated according to Eq [2]. If present, 13C of green leaf material was used for calculating . Linear regression is pooled for both varieties and R2-values are calculated for +P-treatments (solid line) and all treatments excluding treatment -P-W (broken line)