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Effect of fertilizer and weed control on stem form and average taper in plantation grown pines


Australian Forest Research 11(3-4): 209-222
Effect of fertilizer and weed control on stem form and average taper in plantation grown pines
The basic shape of tree boles can be characterized by 2 measures, form and average taper. Evidence is presented to show that fertilization of Pinus radiata at the time of 1st thinning may have a significant effect on stem form because relative diameters in the central portion of the stem are increased by fertilization. Larger growth responses obtained by fertilizing P. radiata or P. elliottii at establishment may be accompanied by changes in average taper diameter/height. Such changes are partially confounded with the growth response. By studying the change in average taper as tree size increases with age it is shown that average taper depends not only on tree size but also on establishment practices. By comparing trees of similar size (e.g., diameter) but different ages, it is shown that the average taper of fertilized trees may be significantly greater than control trees. In P. radiata a similar effect was obtained with weed control, achieved by either weedicides or cultivation.


Accession: 005239080



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