Most cropping soils in the southern region contain one or more subsoil physicochemical constraints, such as high boron or sodicity, that can effect root growth, limit water and nutrient use by crops and decrease yield.

Sub-soil manuring (application of large amounts of organic matter at depth) has displayed some potential but adoption is limited by a lack of information on economic return, logistics and suitable machinery. This investment aims to develop the knowledge, agronomic practices and review the machinery available to support the reliable adoption of subsoil manuring whilst reducing the associated financial risk and other logistical constraints currently limiting the uptake of this practice.