|Stecker, John - UNIV OF MO|
|Brown, James - UNIV OF MO|
Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: October 27, 1997
Publication Date: N/A
Technical Abstract: As interest increases in starter fertilizer for no-till cropping systems, temporal and spatial dynamics of undisturbed starter bands in no-till soil need to be understood in order to assist in development of a soil sampling strategy that accounts for residual P in bands. At sites in central, northeast, and northwest Missouri, starter bands for corn of 22 and 44 kg P/ha treatments were marked with monofilament fishing line, in order to precisely mark and sample the bands at later times. Bands were sampled on a 1.25 cm grid approximately 6 and 12 months after application. Soil P from the 6 month sampling was analyzed with a 6M HCl extraction. Residual soil P in starter bands was approximately circular in the areas of highest concentration (289 to 1276 ppm), but bands became elliptical (8 to 10 cm long vertical axis and a 6 to 9 cm wide horizontal axis) with increased distance from the band center. Band P concentrations from the 44 kg P/ha treatments were typically greater but not twice that of the 22 kg P/ha treatments.