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Fluid Journal : Fluid Journal 2008-2009
Dr. Koenig is an extension soil specialist and chairman of the Department of Soil Sciences and Mr. Esser is the Lincoln/Adams Area County Extension educator, Washington State University. stimulated excessive vegetative growth that depleted stored soil moisture and reduced late-season grain yields. This is similar to the "haying off" response observed in wheat grown in low-moisture, crop-fallow rotations in Australia. Early results of this study indicate a good potential for dryland wheat to respond to fluid P in the low rainfall, crop-fallow areas of eastern Washington. Intermediate rates of fluid P should be applied to optimize yield and prevent grain yield reductions in this moisture-limited environment. Methodology Fertilizers. Fertilizers used were fluid ammonium polyphosphate, 32-0-0, and MAP. Placement. P was placed at (Figure 1) or two weeks before seeding (Figures 2 and 3). Soft winter wheat seeding rates were 40 lbs/A with 12-inch spacing. Crop. Winter wheat grown in a traditional, 2-year crop-tillage fallow rotation. Plots. Individual plot dimensions were7to8feetwideby50feet long. Phosphorus rate (lb P2O5/acre) 0 10 20 30 40 50 Dry matter yield at anthesis (lb/acre) 0 1000 2000 3000 4000 5000 6000 7000 Grain yield at maturity (bu/acre) 40 45 50 55 60 65 70 Dry matter with fluid 11-37-0 Dry matter with dry 11-52-0 Grain yield with fluid 11-37-0 Grain yield with dry 11-52-0 Ralston, cv. 'Bauermeister' Phosphorus rate (lb P2O5/acre) 0 10 20 30 40 50 Dry matter yield at anthesis (lb/acre) 0 1000 2000 3000 4000 5000 6000 Grain yield at maturity (bu/acre) 40 45 50 55 60 65 70 Dry matter with fluid 11-37-0 Dry matter with dry 11-52-0 Grain yield with fluid 11-37-0 Grain yield with dry 11-52-0 Lind, cv. 'Bruehl' Figure 3. Effect of P rate and form on dry matter and grain yields of winter wheat at Lind (top) and Ralston (bottom) in 2006-07.
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