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Use of Chlorophyll Fluorescence Assessments to Differentiate Corn Hybrid Response To Variable Water Conditions

USDA-ARS, Lincoln, NE

View larger version (35K): [in a new window]   Fig. 1. Cumulative potential evapotranspiration (PET) and precipitation along with daily maximum and minimum temperatures vs. days after planting for the 2001 growing season at Shelton, NE. Important phenological growth stages are depicted near the bottom portion of graph. The R1 and R5 stages correspond to the silking and dent growth stages, respectively.

View larger version (23K): [in a new window]   Fig. 2. Average leaf temperature (a), chlorophyll content via SPAD chlorophyll meter (b), quantum efficiency of photosystem II, PSII (c), and thylakoid electron transport rate, ETR (d) for two water treatments (deficit and adequate) on three measurement dates in 2001 at Shelton, NE. Phenological growth stages for three measurement dates are also shown in the upper portion of graph.