Available-water capacities of some intrazonal soils of New Zealand

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Abstract
Eleven yellow-brown loams, formed mostly on fine textured andesitic ash, had a mean capacity for storing 126 mm of plant-available water in the top 76 cm of the profile. (This is more than the mean capacities of most groups of zonal soils on loess or sedimentary rocks.) A few exceptionally coarse textured yellow-brown loams had greater storages than the rest, comparable with those of yellow-brown pumice soils. Many of the yellow-brown loams had high wilting points. Ten brown granular loams, formed on old andesitic ashes or basaltic tuffs, had a mean capacity of 82 mm, less than the mean capacity of any group of zonal soils. The A horizons of 2 rendzinas had available-water capacities similar to those of zonal soils. Weathered limestone in the upper C horizons could store much plant-available water.

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