With an increasing focus on water in recent times, more efficient use of water has become a key issue for many irrigated farms. Irrigation and irrigation scheduling has moved towards a high-tech solution of precise water application, with farm management including an accountability for all water used. There is no generic irrigation practice for all plants in all situations and locations. A grower needs to determine how the plants are responding to irrigation and conditions of their specific farm to fine-tune their irrigation practice to suit the requirements of their crop. However, this review of the literature provides guidelines as to how the plants will respond, in general terms, to certain practices. It is strongly suggested that these systems and practices are used as a guide only and that the plants are regularly monitored until an appropriate irrigation practice can be identified for a particular farm and crop.