The N-P-K soil nutrient balance of Portuguese cropland in the 1950s: The transition from organic to chemical fertilization

1. Carmo, M.
2. García-Ruiz, R.
3. Ferreira, M.I.
4. Domingos, T.

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DOI: 10.1038/S41598-017-08118-3 GOOGLE SCHOLAR lock_openOpen access editor

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