In a study of all State exotic forests in New Zealand, the average annual costs for forest overheads of general administration, camps and hostels, repairs and maintenance of roads, bridges and buildings, and fire protection (including prevention and suppression) for three years (1962-64) were...

An analysis based on three management regimes for sawtimber (varying by the date of first clear felling for ages 35, 42 and 50) at interest rates of 4-7%, with and without social costs, with and without sawmill costs and profits, and for three ranges. Results were compared with those for Pinus...

The net effect found in this mill study (species not given) was that residual log value (i.e. the the miller could afford to pay for his logs and still cover all costs) rose markedly with increasing top diameter, but declined with increasing log length at all values of top diameter. [Cf. F.A. 23...

In soils disinfected with MeBr/chloropicrin, the addition of standard NPKMg fertilizer had no effect on Pinus radiata seedling vigour, though it increased it on untreated controls; trebling the rate of P also had a significant effect on controls but none on treated plots. Trebling the rate of N had ...

Describes a new technique for determining the effect of pruning without felling the tree, by constructing a model of the log that would be cut from the pruned length, dividing it into representative battens and boards according to a standard conversion pattern, and stress-grading the divided...

In a 6-year summary, costs varied little in relation to volume cut per acre or methods of cutting. Removal of 6 seed-trees/acre cost little more per unit volume than the removal of 5 times as many in a clear-felled strip, nor did an annual selection felling of 1000 bd. ft./acre. KEYWORDS: logging \ ...

cf. F.A. 22 No. 1344.] Further attempts to isolate the condensed tannin present in Calluna vulgaris from an aqueous acetone extract by salting-out, followed by solvent extraction or precipitation with ether, have led to successful methods of isolation. Quercetin has also been isolated from the...

The economic cleaning of forest drains is a longstanding problem. A machine has now been developed on entirely new lines, which has given encouraging results in prototype form on drains up to 18 in. deep. It consists of a rotor carrying a series of flails driven by the power take-off of a tractor....

It is proposed to establish plantations of this species in Zambia as the basis of an edible-oil industry, if chemical and biological tests give satisfactory results. As the utility of the residual cake has an important bearing on the economics of edible-oil production, the seeds have been analysed...

C14 studies suggested that catechin is a precursor intannin synthesis. A flavonoid rhamnoside, as yet unidentified and not before found in Black Wattle, was discovered in 8% of trees grown from commercial seed. Its occurrence is apparently controlled by a single dominant gene, and this suggests the ...