||Technology in Australia 1788-1988
Table of Contents
I Management Of Native Forests
II Plantations-high Productivity Resources
i Exotic pines
ii Native species
III Protecting The Resource
IV Harvesting The Resource
V Solid Wood And Its Processing
VI Minor Forest Products
VII Reconstituted Wood Products
VIII Pulp And Paper
IX Export Woodchips
X Future Directions
Nutritional requirements (continued)
Effective fertilizer treatments for different soil types and conditions were progressively developed and applied as more and more plantations began to be established throughout Australia from the 1950s. Since the late 1970s there has been a trend to the use of heavier fertilization as a result of further research in South Australia by Woods and in Victoria by Cromer et al.
Nursery technology developed to keep pace with the expansion of planting programs and the better understanding developed through research. Nurseries became larger and operations such as root pruning to strengthen root growth and seedling 'lifting' became more mechanized, with much of the new equipment being developed in New Zealand. As early as 1939 propagation by cuttings was shown to be feasible by Jacobs at the Commonwealth Forestry Bureau but this has only recently been adopted to any significant degree for the production of plantation stock.
For the early plantations the clearing and planting operations were essentially manual and labour-intensiv -not such a disadvantage during the Depression years, when large areas were established -but became progressively more mechanized after the Second World War. From the earliest times much of the land used was abandoned farm land, or land carrying scrub or poor quality trees. When this was cleared and its vegetation stacked and burned it was observed that where ash beds had been, the subsequent growth of the plantation was improved. This so-called 'ash bed' effect was shown by Pryor in 1963 to be due to increase in soil nutrients and possibly also to modification of the soil and its organisms by the high temperatures.
Mechanized planting of the open-rooted pine seedlings was introduced in 1950 using US-developed machinery and produced about a tenfold increase in labour productivity. Later developments in low ground pressure tracked vehicles gave the ability to establish plantations satisfactorily in poorly drained sites and extend the range of country that could be utilized. A ripping, ploughing and mounding technique developed in Queensland overcame soil compaction and pasture grass problems with former grazing land.
A major problem was competition from 'weed species' such as wattles that regenerated after clearing, burning and cultivating. They were originally controlled by hand cutting but in the 1950s chemical methods were introduced. Aerial spraying was begun in Victoria in 1967 but most spraying is now ground-based to achieve better control of distribution. The synergism between fertilization and weed control in their effects on early growth rate, indicated first by Waring and later quantified by Cromer et al., has now become a major consideration in plantation establishment.
Organisations in Australian Science at Work - Australian Paper Manufacturers Ltd (A.P.M.); Cellulose Australia Ltd; Forestry and Timber Bureau
People in Bright Sparcs - Cromer, R. N.; Dargavel, J. B.; Henderson, V. T; Jacobs, M. R.; Kessell, S. L.; Nelson, P. F.; Pryor, L. D.; Waring, H. D.; Woods, R. V
© 1988 Print Edition pages 203 - 204, Online Edition 2000
Published by Australian Science and Technology Heritage Centre, using the Web Academic Resource Publisher