Phenology and Yield Efficiency of Early, Mid-, and Late-Maturing Cultivars of Peach in Irrigated Orchards under Mediterranean Climate

Productivity of peach cultivars with different ripening seasons was studied under the growers' conventional conditions of Tunisia. Experiments were performed in northern Tunisia (36 degrees 41 ' N, 10 degrees 15' E). Performances of Flordastar, Royal Glory, and Carnival as respectively early, mid-season, and late ripening cultivars were evaluated under the grower's conventional irrigation programs. Fruit growth, yield, water supply, and water productivity were determined through four years. For the three cultivars, Flordastar, Royal Glory, and Carnival, fruit maturity was achieved at 650, 1100, and 2200 GDD, respectively. Average yields were 17.4, 29.8, and 41.1 t ha(-1) and mean values of water productivity were 1.9, 3.1, and 3.6 kg fresh yield m(-3) for early, mid-season, and late cultivars, respectively. Results of agronomic performances evaluation at the farm scale provided a reference on the behavior of early, mid-season, and late cultivars of peach in irrigated orchards in semi-arid conditions.y