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Interpretive Summaries:
Site-Specific Nutrient Management for Corn in El Salvador, 2008
One experimental site was established at Santa Cruz Porrillo, La Libertad, in El Salvador, to initiate a site-specific nutrient management (SSNM) project for corn produced in this region. Using an omission plot technique, fully fertilized plots were compared against plots with individual omission of N, P, K, S, and Mg to quantify indigenous nutrient supply, yield potential, and nutrient requirements for corn at these three sites. The complete fertilizer treatment produced 6.2 t/ha and farm practice produced 5.6 t/ha. The plots omitting N, P, K, Mg, and S produced 2.7, 6.3, 5.4, 6.0, and 5.8 t/ha, respectively.
The yield obtained with the complete treatment will be used as a yield goal for the next two cycles because it represents yield potential for the climate of the region. With this yield goal, a new fertilizer recommendation will be calculated taking into account the yields of the respective omission plots. This recommendation will be tested as an extra plot along with the omission plots. More sites will be included in this project next year using the same set of omission plots. El Salvador-02
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