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- extension agents[remove]4
- extension communication[remove]4
- farming systems research[remove]4
- extension education2
- farmers2
- linkages2
- on-farm research2
- Ecuador1
- Zambia1
- agriculture research1
- cooperation1
- development1
- development communication1
- extension methods1
- extension services1
- extension systems1
- farming methods1
- feedback1
- information sources1
- information systems1