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Abstract
Terrace soils of the Lower Waitaki Plains have a high volume of stones, ranging from 17.5% to 61.2% by volume over the 0.24 in. depth. Although these soils are silt loarns, with a high percentage of organic carbon, the moisture-holding capacity is considerably reduced by the volume of stones. The average available moisture for the 0–12 in. depth is 1.95 in., considerably lower than that of similar soil groups studied in this series of investigations.
Soils of the downlands are stone-free and have an average available moisture of 2.81 in. for the 0–12 in. depth.
Some of the soils studied have low macroporosity values in the depths below 4 in. Any tendency for the macroporosity to decrease after irrigation could result in increased drainage problems.