| Growth chamber experiments were conducted from 1992 to 1994 on a calcareous silty clay loam soil (pH ;Canola was very efficient at utilizing applied P, with no apparent benefit from increased area of application or dual banding with N. However, fertilizer P uptake by wheat increased slightly with area of application, Dual banding the P fertilizer with N or MgSO;Studies were also conducted using very wide band widths. Labelled MAP was randomly applied in powdered form to several points within the bands, to simulate granular applications. Ammonium sulphate was dual banded with the MAP granules (placed in direct contact) or randomly scattered within the band. Fertilizer P uptake declined slightly as band width increased from 2.5 to 15 cm, particularly at earlier growth stages. Dual banding with ammonium sulphate improved P fertilizer utilization and yield. (Abstract shortened by UMI.). |
