ORGANIC SUGARCANE CULTIVATION IN TAHITI

Abstract

Organic sugarcane has a strong economic potential in Tahiti. However, there is nomodel for small-scale organic cultivation, and the rules enforced by the applicablestandards don’t always respect the agroecological principles. To determine whethera small organic sugarcane farming system is profitable or not, especially in termsof productivity, control of bioagressors (weeds, rats and pests) and human resourcecosts, a 1ha field of sugarcane was planted in 2015, with nine different varieties, ina machineable context under European organic standards. After two years, thecultivars used showed yields from 40 up to 100 tons/ha of cane. Regarding thecontrol of bioagressors results were the following: 1) manual removing of weedsrequired 4 to 6 months after planting or after the first ratoon; 2) study of rat attacksduring the maturation period showed that in a dirty field, for early varieties (18°Brix at ten months of cultivation), the cane stalks can be entirely damaged, andthese attacks can even occur on canes with sugar content lower than 10%. Finally,the hand labor hoeing represented around 75% of the production costs. This resultdemonstrates that such organic cultivation is possible even when facing pest andweed problems. In further investigations, to improve hand labor efficiency, we willfirst focus on weed control using small mechanized treatments; secondly, we willaim at reducing rat infestations by the use of some unique early maturated varietiesto attract and treat them locally.