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Residual Phosphorus Distribution and Sorption in Starter Fertilizer Bands Applied in No-Till Culture

^a Soil Testing Lab., Univ. of Missouri, Columbia, MO 65211
^b Dep. of Soil Science, Univ. of Missouri, Columbia, MO 65211
^c USDA-ARS, Cropping Systems and Water Quality Research Unit, Univ. of Missouri, Columbia, MO 65211

View larger version (50K): [in a new window]   Fig. 1. Diagram showing (A) the method of subdividing soil blocks into block, layer, and cell samples, and (B) a soil block and the pattern from which cell and layer samples were cut. Numbers represent those used to code the samples.

View larger version (37K): [in a new window]   Fig. 2. Bray-1 P distribution from bands of 10 and 20 kg P ha-1 applied to a Mexico soil. Values are relative to soil in adjacent nonband-affected soil and converted to log base 1.5.

View larger version (37K): [in a new window]   Fig. 3. Bray-1 P distribution from bands of 10 and 20 kg P ha-1 applied to a Putnam soil. Values are relative to soil in adjacent nonband-affected soil and converted to log base 1.5.

View larger version (40K): [in a new window]   Fig. 4. Bray-1 P distribution from bands of 10 and 20 kg P ha-1 applied to a Dockery soil. Values are relative to soil in adjacent nonband-affected soil and converted to log base 1.5.

View larger version (26K): [in a new window]   Fig. 5. Predicted volume of band-affected soil in the surface 15 cm from annual and biannual band applications on a 76-cm spacing in a Mexico soil. Assumes cumulative volume of undisturbed bands. Band volume at 18 mo for annual applications is sum of 6 and 18 mo volumes; at 24 mo, it is the sum of 12 mo and an extropolated value from 18 mo.

View larger version (103K): [in a new window]   Fig. 6. Residual band Bray-1 P concentrations in the direction of application for the 20 kg P ha-1 treatment for two plots each of the Mexico, Putnam, and Dockery soils, Fall 1997 sampling. The line represents the mean of the 10 subsamples. The upper bar represents the P value from the 2-cm band center sample. The lower bar represents an average of cell samples and the 2-cm band center sample that would represent a probed sample of 0 to 15 cm.

View larger version (24K): [in a new window]   Fig. 7. Phosphorus sorption curves for the Nonband soil of the Mexico, Putnam, and Dockery soils that were sampled in Spring 1997.

View larger version (31K): [in a new window]   Fig. 8. Phosphorus sorption curves for soil around residual P bands of the Putnam soil for 10 and 20 kg ha-1 P rates at three sampling times.

View larger version (24K): [in a new window]   Fig. 9. Relationship between Bray-1 P and zero net absortion (EPCo) for the Putnam soil, sampled Spring 1997. BC represents Band center soil, and BOC represents Band off center soil.

View larger version (29K): [in a new window]   Fig. 10. Relationship between Bray-1 P and Buffer Capacity for the Putnam soil, sampled Spring 1997.

View larger version (20K): [in a new window]   Fig. 11. Relationship between Bray-1 P and the ratio of P extracted by the Bray-1 extractant and 6 M HCl for the Mexico soil sampled Spring 1997.