"Nonextractable" soil inorganic phosphorus can have both a primary and a secondary origin. Apatite included within other minerals and phosphorus distributed throughout mineral lattices constitute the primary sources. ...

The objective of the project is to provide information on an accept-reject decision on the Osborne’s Drain Improvement Scheme. The scope of the project is to prevent flooding and to improve the efficiency of drainage, so ...

The evaluation of projects which demand capital strikes at the heart of the economic problem - that is - the making of decisions about the allocation of scarce resources amongst competing ends. In a perfectly competitive ...

In many areas lucerne has become increasingly important as a forage crop. In the past lucerne was used largely as a hay or silage crop. The result is that research has been concentrated mainly on aspects of management which ...

Early in 1962 the Forest Research Institute of the New Zealand Forest Service became aware that stands of second crop Pinus radiata (D. Don) on some areas of the Moutere Gravel formation were showing slow growth and had ...

A modified version of the phosphate fractionation procedure of Chang and Jackson (1957) included the determination of "residual inorg. P" and introduced a revised nomenclature for the other fractions. Added phosphate sorbed ...

Phosphate fertilisation of soils is essential for the maintenance of high levels of agricultural production. This is especially true in New Zealand, where repeated topdressings with superphosphate are essential for the ...

The study undertaken was carried out in the montane tussock grassland region which in the South Island comprises some six million acres. Field trials were established at Mt Somers, Mid Canterbury. This study attempts to ...