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Nitrogen fertilizer replacement indexes of legume cover crops in the derived savanna of West Africa por Tian, G., Kolawole, G.O., Kang, B.T., Kirchhof, G.

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Conservation of a tropical alfisol using legume cover crop intercropping and residue mulch por Salako, F.K., Kirchhof, G., Tian, G.

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Low input tillage/cropping systems for limited resource areas por So, H.B., Kirchhof, G., Bakker, R., Smith, G.D.

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Overview of soil conservation technologies and their perception by farmers in Nigeria por Junge, B., Deji, O.F., Abaidoo, Robert C., Chikoye, David, Stahr, Karl, Kirchhof, G.

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