4 Crop management
Demonstration trials comparing existing farmer practices, improved practices and scientifically tested practices provide some of the most useful training for Aceh farmers, especially when new practices or amendments are being introduced. Demonstration trials that actively involve farmers provide evidence of change, but may not be scientifically valid.
Scientifically designed field trials (Figure 12) are set up with a number of replicates to determine statistical differences between treatments. They require the input of trained researchers, and are therefore only possible if resources are available to employ researchers.