Cabbage production and productivity in Ghana is limited due to poor water availability. K-K Cross and Oxylus which are the most widely used cabbage cultivars and more available in Ghana were used as test crops and grown with a small-scale drip irrigation system in a coastal savannah habitat. The study's primary objective was to create a water production model for the two cabbage varieties grown at varied water application levels for marketable fresh yield/weight, total fresh yield and total dry matter, using the family drip irrigation technology. Irrigation was set at applications of 40%, 55%, 70%, 85%, and 100% of the water needed through evapotranspiration by the use of the Penman-Monteith model. The split-plot design was used to conduct the experiment in three replicates, with the main plot consisting of the applied water levels and the two cabbage varieties assigned to the sub-plots. The quadratic functions adequately described the relationship between the productivity of the cabbage cultivars and levels of water applied.

Keywords: Available water, marketable fresh yield, neutron probe, quadratic relationship, total dry matter, water application