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- Africa[remove]4
- soil fertility[remove]4
- Kenya (Africa, Eastern)2
- soil2
- technological advancement2
- Asia1
- Ghana (Africa)1
- Mali (Africa, Western)1
- Uganda (Africa, Eastern)1
- Zambia (Africa, Eastern)1
- adoption1
- adoption behavior1
- communication1
- communication methods1
- communication research1
- communication systems1
- cooperation1
- cooperative programs1
- crops1
- developing nations1