Abstract
Abstract The boron (B) status of yellow-brown pumice and other soils was determined by a sunflower test and by hot water (HWS B) and ammonium acetate (NH4Ac B) extractions. Plant-available B in pumice soils was higher in soil from lucerne paddocks than from pasture because B fertiliser had been applied to the lucerne. In soils under both lucerne and pasture, available B was highest in the surface layer and decreased with depth. The available B in soil samples under pasture was much lower on yellow-brown pumice soils than on other soils. Hot-water extraction gave the same indication of B status as sunflowers for all soils, but NH4Ac did not. Pumice soils are low in B and fertiliser B is necessary when crops with high B requirement are grown. Hot-water extraction is a reliable and satisfactory method for determining available B in these soils.
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