Effect of calcium silicate and superphosphate application on surface charge properties of volcanic soils from West Sumatra, Indonesia por Fiantis, D., Van Ranst, E., Shamshuddin, J., Fauziah, I., Zauyah, S.

Charge characteristics in relation to free iron and organic matter of soils from Bambouto Mountains, Western Cameroon por Van Ranst, E., Shamshuddin, J., Baert, G., Dzwowa, P. K.

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