Estimates of soil phosphate retention (P-retention; units: %) for the depth interval between 0 to 7.5 cm, covering all of New Zealand. Estimates are made on a grid where each grid cell has dimensions 1,000 m x 1,000 m (100 ha). The value at each grid cell is our best estimate of the mean P-retention across the area occupied by each grid cell. The layer was generated using a quantile regression forest which was fitted using a number of environmental datasets including soil parent material, topography and climate layers. Saunders WMH 1965. Phosphate retention by New Zealand soils and its relationship to free sesquioxides, organic matter, and other soil properties. New Zealand Journal of Agricultural Research 8(1):30–57. doi:10.1080/00288233.1965.10420021
