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| publishing year | previous | first author | document title |
|---|---|---|---|
| 1962 | Bragantia | Camargo, A. Paes de | Fertilizer experiments with sweet potatoes: III - Trials on the placement of npk and manure |
| 1966 | Bragantia | Breda Filho, José | Effect of nitrogen, phosphorus and potassium on sweet potatoes cultivated on "cerrado" soils |