2010 - Site-Specific Nutrient Management for Corn in Ecuador
2009 - Site-Specific Nutrient Management for Corn in Ecuador
2008 - Site-Specific Nutrient Management for Corn in Ecuador
2007 - Site-Specific Nutrient Management for Corn in Ecuador
2006 - Site-Specific Nutrient Management for Corn in Ecuador
Site-Specific Nutrient Management for Corn in Ecuador, 2010
In 2010, this study could be implemented in only four out of the six locations used in 2009. As in 2009, planting occurred in two seasons: rainy (January to May 2010) and dry (June to October 2010).
Together with the complete balanced treatment (about 200 kg N, 60 kg P2O5, 90 kg K2O, 44 kg K2O, and 36 kg S), omission plots (the exclusion of N, P, K, Mg, and S, respectively), a site-specific (SSNM) recommendation (230 kg N in one location and 200 kg N in the rest, P ranging from 50 to 120 kg among other changes) and traditional farmer fertilizer use (from 80 to 150 kg N/ha, from 23 to 45 kg/ha P2O5 and other location specific values) were evaluated for each location.
In three locations the locally generated ‘INIAP-553’ hybrid was evaluated, while in the Salapi location the hybrid planted was the commercial ‘Dekalb 7088’. Dekalb has a higher yield potential, estimated at about 13 t/ha grain versus 10 t/ha for INIAP-553. In all locations, a planting density of 80,000 plants/ha was used.
Among complete balanced fertilization treatment, the highest and lowest yields were observed in Pichilingue, rainy (9.3 t/ha grain) and Pavon, dry (6.6 t/ha grain). At all the sites, the SSNM recommendation was similar in yield with the exception of Salapi, rainy season, where the yield was higher than the balanced fertilization. In all sites, the lowest yields were observed with N omission (from 2.9 to 3.5 t/ha grain), with significant decreases for K and S depending on the location.
This was the last year of the experiment as such. We are trying to expand the use of the SSNM approach to other regions of Ecuador as we present the results of the 3 years of activities in all sites of Ecuador, including the activities in the companion study made with soft corn in the highlands. Ecuador-08