Fertiliser deep banding: deep banding immobile fertiliser nutrients in clay soils to support rain-fed cropping – QLD (Factsheet)
This Grains Research and Development Corporation (GRDC) factsheet explains how deep banding fertiliser can be used in northern Australian grain cropping systems with extended dry periods. Nutrients in dry shallow topsoils are generally inefficient and neither phosphorus nor potassium will leach into deeper soil layers in clay soils. Deep fertiliser banding can re-distribute these nutrients into the subsoil and is most effective when applied during the fallow period while there is still adequate subsoil moisture, allowing nutrients to be placed into moist soil layers where crop roots can access them later in the season. It also outlines practical considerations including placement depth, nutrient type, machinery requirements and risks associated with dry soil placement. While the guidance is specific to northern Australian farming systems, the principles may be relevant to similar cropping regions [PDF 1.7 MB, 6 pages].#
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