This information was published in 1966 in An Encyclopaedia of New Zealand, edited by A. H. McLintock. It has not been corrected and will not be updated.
Up-to-date information can be found elsewhere in Te Ara.
FERTILISERS, LIME, AND TRACE ELEMENTS
The following common crops appear to have a greater need for readily available phosphorus than grass-clover pasture – potatoes, barley, and all brassica species including turnips, swedes, chou moellier, rape.
Autumn-sown wheat does not need a very generous supply of phosphorus, but spring-sown wheat may approach barley in its sensitivity to low levels of available phosphorus. The position of oats in relation to other crops and to pastures is not well known.