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Simulating Seed Number in Grain Sorghum from Increases in Plant Dry Weight

^a Texas Agric. Exp. Stn., Texas A&M Univ. Syst., Blackland Res. and Ext. Cent., 720 East Blackland Rd., Temple, TX 76502
^b Dep. of Agron., Kansas State Univ., Manhattan, KS 66506
^c School of Plant Biol., Univ. of Western Australia, Crawley, WA 6009, Australia

View larger version (31K): [in a new window]   Fig. 1. Accumulation of aboveground dry weight (g/m2) with growing degree days from sowing (GDD) for sorghum hybrids Cargill 4462 and Cargill 6670 in spring and autumn sowings at each of two plant densities. The symbols represent actual data, and the curves are derived from the exponential equations presented in Table 5.

View larger version (24K): [in a new window]   Fig. 2. The relationship between final seed number per plant and cumulative aboveground dry weight during 360 growing degree day (GDD) interval for panicle branch–spikelet formation (A–540 to A–180) and panicle elongation–anthesis (A–180 to A+180) for sorghum hybrids Cargill 4462 and Cargill 6670 in spring and autumn sowings at each of four plant densities (5, 12, 19, and 26 plants/m2).

View larger version (23K): [in a new window]   Fig. 3. The relationship between simulate and observed seed number per plant for the current SORKAM model with the equation for the interval including panicle branch formation through anthesis (e.g., E; see Eq. [14] in Table 6), the SORKAM model with the equation for the interval including panicle branch–spikelet formation (e.g., PBS; see Eq. [16] in Table 6), and the SORKAM growth model with the panicle elongation–anthesis interval (e.g., EA; see Eq. [17] in Table 6). SORKAM simulations in this figure use the stress coefficient for dry weight (WATCOdw) to modify simulated seed number for water stress.

View larger version (22K): [in a new window]   Fig. 4. The relationship between simulated and observed seed number per plant for the current SORKAM, the SORKAM model with the equation for the interval including panicle branch–spikelet formation (e.g., PBS; see Eq. [16] in Table 6), and the SORKAM growth model with the panicle elongation–anthesis interval (e.g., EA; see Eq. [17] in Table 6). SORKAM simulations in this figure use the stress coefficient for leaf expansion (WATCOle) to modify simulated seed number for water stress.

View larger version (24K): [in a new window]   Fig. 5. The relationship between observed and simulated seed number per plant for SORKAM model containing the WATCO switch to apply the empirically derived equation for the panicle branch–elongation interval (PBS; Eq. [16], Table 6) or the panicle elongation–anthesis interval (EA; Eq. [17], Table 6) using (a) the water stress coefficient for leaf area (WATCOle), (b) the water stress coefficient for dry weight (WATCOdw), or (c) the original SORKAM equations and replacing WATCOle with WATCOdw in the PBS or EA interval, whichever is greater, but applying WATCOle to simulation of seed numbers to both intervals when water stress is equal.