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Phosphorus Availability under Continuous Point Source Irrigation

^a Arava Res. and Dev., mobile post Eilot 88820, Israel
^b Utah State Univ., Plant Soils and Meteorology Dep., 4820 Old Main Hill, Logan, UT 84322

View larger version (15K): [in a new window]   Fig. 1. Phosphorus sorption isotherm for Kidman sandy loam soil. Symbols are averages of three replicates and the line is the fitted Langmuir equation. C = concentration of P in solution, Q = adsorbed P.

View larger version (43K): [in a new window]   Fig. 2. Schematic representation of greenhouse lysimeter set-up with gravitational water application and drainage collection.

View larger version (38K): [in a new window]   Fig. 3. Volumetric water content in soil as modeled in Hydrus-2d at four distinct times during a 10-d simulation for the three irrigation regimes.

View larger version (56K): [in a new window]   Fig. 4. Soil solution P concentrations as modeled in Hydrus-2d at three times during a 10-d simulation for the three irrigation regimes.

View larger version (99K): [in a new window]   Fig. 5. Measured gravimetric water content, bicarbonate extractable P and 2:1 water:soil pH distribution isocharts after 14 d of intermittent and continuous fertigation on a bare soil. Samples were taken in the middle of the 2-d irrigation cycle.

View larger version (53K): [in a new window]   Fig. 6. Sweet corn biomass yields after 26 DAP (top) and 40 DAP (bottom) for 2-d intermittent or continuous fertigation. Y-error bars are standard deviations of three replicates.

View larger version (53K): [in a new window]   Fig. 7. Root density distribution isocharts for corn plants receiving 2-d intermittent or continuous fertigation.

View larger version (62K): [in a new window]   Fig. 8. Plant tissue P in corn plants fertigated with 2-d intermittent or continuous treatments. Harvest 1 was 26 DAP and Harvest 2 was 40 DAP. Y-error bars are standard deviations.