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Alvarado, Alfredo, Isabel Iturriaga, Jot T. Smyth, Edward Portuguez, y Juan M. Ureña. Residual Effect of Phosphorus From Fertilizer Applied to Potatoes in Andisols At Juan Viñas, Costa Rica. 2008.

Alvarado, Alfredo, et al. Residual Effect of Phosphorus From Fertilizer Applied to Potatoes in Andisols At Juan Viñas, Costa Rica. 2008.