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In Situ Dynamics of Phosphorus in the Rhizosphere Solution of Five Species

^a Department of Natural Resource Ecology and Management, 253 Bessey Hall, Iowa State University, Ames, IA 50011-1021
^b USDA-ARS National Soil Tilth Laboratory, Ames, IA 50011-4420

View larger version (73K): [in a new window]   Fig. 1. Schematic drawing and photograph of the mini-rhizotron with an array of micro-suction cups installed. Each probe is connected to a discrete sample vial contained in the vacuum box. A computer-regulated vacuum pump is attached to the vacuum box and a tension of –100 kPa is applied to each micro-suction cup through the vacuum box.

View larger version (29K): [in a new window]   Fig. 2. Time course of P concentration in the soil solution for three different root distance classes for corn (A), soybean (B), cottonwood (C), smooth brome (D), and switchgrass (E) plants. Individual points in each figure are the means of all sampling points falling within each distance class on that day. The number of sampling points within each distance class can change with sample day. Note the difference in length of study period for switchgrass.

View larger version (178K): [in a new window]   Fig. 3. Photograph of cottonwood roots growing in a mini-rhizotron. The circular white points arrayed across the photograph are the micro-suction cups. Numbers in parentheses are used to identify each sampling point. Values shown are solution P concentrations (mg L–1) observed after 10 d of root growth. Micro-suction cups near the top of the photograph have been influenced by root uptake for a longer period of time. Lower values near roots emphasize the effect the plant has had in decreasing solution concentration near the root compared with those in bulk solution. The sample volume at Point 2 was not sufficient for analysis of P concentration.