This study proposes an allocation LP model that can take into account
heterogeneity of land area. The divided scenario into several sub-areas
based on suitable soil type for each crops was used to represent the heterogeneous
character in term of water requirement and crop yield. The proposed model
was applied to find the dry-season (January-May) crop pattern of the Nong
Wei Irrigation Project which located in the Northeast Region of Thailand.
The records of seasonal flow, requested areas, crop water requirements,
evaporation and effective rainfalls of the project were used for this
illustrative application. Results showed that the proposed LP model gave
the optimum crop pattern with net seasonal profit which corresponding
seasonal available water and required area. It provided the highest profit
as compare to the existing LP model that considering homogeneous project.
The obtained patterns of considering heterogeneity corresponded to the
available land areas of the suitable soil type.