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Comparison between Organic and Mineral Fertilization for Soil Fertility Levels, Crop Macronutrient Concentrations, and Yield

^a Instituto de Investigación y Formación Agraria y Pesquera "Las Torres-Tomejil" Seville (IFAPA), Carretera Sevilla-Cazalla de la Sierrra km 12.2, 41200 Alcalá del Río Seville, Spain
^b Instituto de Recursos Naturales y Agrobiología de Sevilla (CSIC), Apdo 1052, 41080-Sevilla, Spain

View larger version (14K): [in this window] [in a new window]   Fig. 1. Values of organic carbon (OC) in the three greenhouse plots (G1, G2, G3) across different cultivation cycles ranging from autumn (A) 1999 through spring (S) 2004. Mineral plots (closed circle); organic plots (open circle). Error bars indicate standard deviations of means (n = 8).

View larger version (12K): [in this window] [in a new window]   Fig. 2. Values of Kjeldahl N (N) in the three greenhouse plots (G1, G2, G3) across different cultivation cycles ranging from autumn (A) 1999 through spring (S) 2004. Mineral plots (closed circle); organic plots (open circle). Error bars indicate standard deviations of means (n = 8).

View larger version (14K): [in this window] [in a new window]   Fig. 3. Values of P Olsen in the three greenhouse plots (G1, G2, G3) across different cultivation cycles ranging from autumn (A) 1999 through spring (S) 2004. Mineral plots (closed circle); organic plots (open circle). Error bars indicate standard deviations of means (n = 8).

View larger version (14K): [in this window] [in a new window]   Fig. 4. Values of available K in the three greenhouse plots (G1, G2, G3) across different cultivation cycles ranging from autumn (A) 1999 through spring (S) 2004. Mineral plots (closed circle); organic plots (open circle). Error bars indicate standard deviations of means (n = 8).

View larger version (13K): [in this window] [in a new window]   Fig. 5. Values of pH in the three greenhouse plots (G1, G2, G3) across different cultivation cycles ranging from autumn (A) 1999 through spring (S) 2004. Mineral plots (closed circle); organic plots (open circle). Error bars indicate standard deviations of means (n = 8).

View larger version (14K): [in this window] [in a new window]   Fig. 6. Values of electrical conductivity (EC) in the three greenhouse plots (G1, G2, G3) across different cultivation cycles ranging from autumn (A) 1999 through spring (S) 2004. Mineral plots (closed circle); organic plots (open circle). Error bars indicate standard deviations of means (n = 8).