Many corn hybrids that are tolerant to high pH conditions may reduce yield potential on soils with pH above 8 due to pH-induced iron chlorosis. Previous research has suggested that relatively predictable and consistent chlorosis pressure is important for the benefit of using site-specific hybrid management. Research was conducted on variably high pH soils in Nebraska in 2004-2005 characterizing and mapping chlorosis pressure in fields to evaluate the potential for site-specific corn hybrid management. Soil surface pH, soil apparent electrical conductivity (ECa), and natural color and near-infrared aerial imagery have been taken at each site and analyzed with and without chlorosis pressure on chlorosis tolerant and susceptible hybrids planted on field length strips. Combines equipped with yield monitors and GPS were used to map yield of each hybrid strip. This paper will discuss the small negative correlation between delta yield (difference between chlorosis tolerant and chlorosis susceptible hybrid yield) and soil pH from 2004 results. The comparison of yields of the chlorosis tolerant hybrid (P34B99) and the susceptible hybrid (P3N42) within chlorosis pressure zones will also be presented to determine the potential of site-specific hybrid management. Correlation between delta yield and the soil pH from 2005 will be conducted at the end of the growing season.
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