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A General Thermal Index for Maize

^a Agric. & Agri-Food Canada, Eastern Cereal & Oilseed Res. Ctr., Ottawa, ON, K1A 0C6, Canada
^b Pioneer Hi-Bred Int., Plant Breeding Div., Willmar, MN 56201 USA

View larger version (15K): [in a new window]   Fig. 1 Temperature response as a function of mean daily air temperature for the vegetative (Eq. [2]; solid line) and grain filling (Eq. [3]; dashed line) periods

View larger version (22K): [in a new window]   Fig. 2 Frequency distribution of mean daily air temperatures at 19 locations ranging from 39° to 48° N lat over five years (1992–1995) for Day of Year (a) 170–190, (b) 190–210, (c) 210–230, (d) 230–250, and (e) 250–270

View larger version (23K): [in a new window]   Fig. 3 Frequency distribution of mean daily air temperatures at four locations in the main data set (Mankato, MN; Willmar, MN; Moorhead, MN; Grand Forks, ND) with latitudes >44° N for Day of Year (a) 170–190, (b) 190–210, (c) 210–230, (d) 230–250, and (e) 250–270

View larger version (23K): [in a new window]   Fig. 4 Frequency distribution of mean daily air temperatures at the five locations in the second data set ranging from 41° to 45° N lat over four years (1994–1997) for Day of Year (a) 170–190, (b) 190–210, (c) 210–230, (d) 230–250, and (e) 250–270

View larger version (13K): [in a new window]   Fig. 5 Standard error (SEE) in estimating periods from planting to maturity in main data set when transition from Eq. [2] to Eq. [3) occurs on different days of the year (end of June to early November)

View larger version (36K): [in a new window]   Fig. 6 Estimated number of days from planting to maturity, using GTI with a constant transition date of 1 Aug., GDD, and CHU, minus the actual number of days for 17 site-years in the second data set. Years are designated by the last two digits. Sites are designated by the letters O for Ottawa, ON; P for Ste Polycarpe, QC; Wo for Woodstock, ON; Wi for Willmar, MN; and J for Johnston, IA