Late season sugarcane performance as affected by soil water regime at the yield formation stage on commercial farms in northern Ivory Coast

摘要

A field trial was carried out in Ferke 2 Sugar mill located in northern Ivory Coast, in order to study sugarcane growth and yield response to deficit irrigation imposed at the yield formation stage. The crop used was a first ratoon Co957, a non flowering late season sugarcane variety. The experiment was completely randomized following a one-factor design with 4 water deficit treatments in 3 replicates. It came out that the optimum water deficit treatment was 20 %, i.e., 80 % of crop water requirements were satisfied through irrigation. That treatment gave 7.9 kg cane/m~3 or 0.98 kg sugar/m~3 as irrigation water use efficiency. More over, relatively low crop growth as well as low yields were obtained as a result of an intensive and persistent dry season occurring over the yield formation stage. Because of prevailing climatic conditions, cane juice quality measured was particularly high on Co 957 which used to be a moderate performing variety in Ferke 2 sugar mill.