ISHS Acta Horticulturae 175: Symposium on Physiology of Productivity of Subtropical and Tropical Tree Fruits
A METHOD FOR COMPARISON OF YIELD PERFORMANCE OF MACADAMIA GENOTYPES BASED ON TREE SILHOUETTE AREA |
| Author: | C.W. Winks |
| Abstract:
Silhouette area compared with yield has been identified as a valid method for relating yield to tree size in macadamia. Silhouette area calculated by measuring the area of tree sketches with a planimeter, was compared with individual tree yield data from nine selections of macadamia in a varietal comparison trial at Beerwah in south east Queensland. The regression of silhouette area on yield for 1984 data gave R values ranging from 0.9288 to 0.4828 when individual varieties were compared and 0.6483 when data were pooled for all varieties. If common slopes are assumed there is evidence that different varieties are more productive than others based on different intercepts on the Y axis (P = 0.88). Similar comparisons based on butt cross-sectional area gave poor correlations. | |
Download Adobe Acrobat Reader (free software to read PDF files) | |
