Abstract
The nutrient composition of macadamia ( Macadamia integrifolia Maiden and Betche) leaves was monitored at monthly intervals to provide information for the development of nutrition management guidelines more suited to local conditions. Leaf nitrogen (N) and potassium (K) followed similar seasonal patterns: levels rose during autumn to high levels in winter, declined in association with the spring flush, flowering and nut-set period, and remained stable over the summer nut-growth/oil-accumulation stage, before declining again in late summer, coinciding with the major summer flush. Leaf phosphorus (P) was similar, but declined earlier during winter. The patterns for calcium (Ca) and boron (B) were different and were determined largely by leaf age. There were no consistent trends in levels of sulphur (S), sodium (Na), magnesium (Mg), copper (Cu), iron (Fe), zinc (Zn), manganese (Mn) or chloride (Cl). Site, involving soil fertility, management and climate, had a dominant effect on levels of N, P and Ca but not on K, which was influenced more by monthly effects. Leaf nutrient levels reflected soil levels and fertilizer applications in some cases, but this was not consistently so.
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