Bio-Economic Modeling of Changes to Traditional Vegetable Production Practices in the Manupali Watershed with Extensions to Other Southeast Asian Watersheds
ERDB, Los Banos,Philippines; University of Illinois; University of California; La Trobe University; Purdue University; Victory Site Manager; Central Queensland University
Land degradation across the high- lands of Southeast Asia is accelerating largely due to the expansion of high value annual cropping. Much of the expansion is due to policy directions that, in turn, influence cropping decisions of upland farmers. The magnitude of soil losses from such systems represents one of the major environmental problems across the region.
Efforts are underway to understand the implications of altered policy and farmer-sanctioned innovations in produc- tion practices on the sustainability of upland farming systems in Southeast Asia. Within this project we provide biophysical and economic data from on- farm and researcher-managed experi- ments that test resource-neutral soil conservation practices and agroforestry practices aimed for their effectiveness in yielding off-site soil sediment but without sacrifice in farm income. Field experiments and data analyses continued in 1999/2000, with outputs in the form of various publications, addi- tions to the site database, and information relevant to bio-economic modeling for the watershed.
1. Provide evidence for or against the thesis that full and/or partial conversion of vegetable farms to agroforestry will lead to sustainable use of soil and water resources, and satisfy the income demand by upland farming families. 2. Provide model parameters for inclu- sion of such evidence into a watershed model. 3. Monitor the changes in the practices of vegetable production and the adoption of participatory-led research substantiated innovations (to be addressed in 2000 to 2001). 4. Provide a robust model for prediction of impacts due to changes in upland vegetable production practices on farm scale income generation and resource management (to be addressed in 2000 to 2001).