Plate 7



   When climate is right, soil continuously improves, but our Australian climate is not everywhere good, and so man must reinforce natural processes.

   Left: During thirteen consecutive months, rainfall conditions were such that the earth of the sand and sandstone footpath (Sydney-eastern suburb) did not once dry out, and there developed this remarkable change, with its growth of white clover, including some plantain. The effect of good soil climate, without clover inoculants, superphosphate or lime, produced this spring growth in 1955.

   Middle: A year later, with less favourable climate, the pasture had deteriorated, and (right) by 1957 it had further changed into a dominantly poor couch grass cover.