Risultati della ricerca - Lefroy, R. D. B.

Phosphate and potash fertilisation of sweet potato on volcanic ash soils in the Southern Highlands of Papua New Guinea / di Floyd, C.N

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Composting and crop production on volcanic ash soils in the Southern Highlands of Papua New Guinea / di Floyd, C. N.

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Soil organic matter management for sustainable agriculture: a workshop held in Ubon, Thailand, 24-26 August 1994 /

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