“Wheat is by far the most valuable plant in the world. It is the main source of food for modern Europe, for much of Asia for America and Australasia. In view of its importance it is strange that there should be no record ...

In 1869, New Zealand use 216 tons of imported fertilizers in addition to a very small amount of local bonedust. Sixty years later, the imports amounted to 324,145 tons, while local production was in the neighbourhood of ...