AN INNOVATIVE SYSTEM TO ACHIEVE EARLY PRECOCITY IN AVOCADO UNDER THE MARGINAL GROWING ENVIRONMENT IN THE BAY OF PLENTY, NEW ZEALAND

Modifications to established practices are required where soil and climate impediments influence tree productivity. Sub-optimal environmental conditions exacerbate physiological stress and subdue reproductive potential. Traditionally, performance has focussed on above-ground expression, while fruit yields from young trees have been disappointing and erratic. Recognition that a favourable root:shoot balance is a necessary pre-condition for early and sustained fruitfulness has inspired new guidelines for orchard establishment and management. Improvements include large, fertilised planting holes, revised nutrient, moisture, and mulch regimes, and a higher ratio of pollinator varieties. Field validation is measured against tree performance. Data collected across 4 young orchards (1-6yr) has delivered valuable information regarding growth patterns, root mass, and fruit yield. Examination of the cultural practices and their contribution to achieve early precocity is presented, as well as potential improvements to the programme.