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Solar Radiation Intercepted during Seed Filling and Oil Production in Two Sunflower Hybrids

Unidad Integrada Facultad de Ciencias Agrarias (UNMdP), Estación Experimental Agropecuaria INTA Balcarce, C.C. 276, 7620 Balcarce, Argentina

View larger version (33K): [in a new window]   Fig. 1 Dry matter accumulation as a function of days after emergence in hybrids G-100 and NKT, Exp. A and B. The arrows show the days of the beginning of flowering (BF) and treatment application (TA). Vertical bars represent the standard error (if there is more than one treatment, largest standard error is shown)

View larger version (21K): [in a new window]   Fig. 2 Seed dry matter per plant as a function of total dry matter in hybrids G-100 and NKT, Exp. A. Values were transformed to ln. The slope (K, ln g seed dry matter/ln g total dry matter) of this relationship is called the allometric constant and is the ratio of the logarithmic growth rates of the two components under study. The slope of shaded treatment for hybrid G-100 was graphically estimated

View larger version (28K): [in a new window]   Fig. 3 Seed yield per plant expressed in energy units (kJ) in hybrids G-100 and NKT, Exp. A and B. For each experiment, means with the same letter are not significantly different (Tukey, P < 0.05)

View larger version (21K): [in a new window]   Fig. 4 Weight per seed as a function of cumulative PAR intercepted from treatment application to physiological maturity, in Hybrids G-100 and NKT, Exp. A, B and C. The equations are: G-100: weight per seed = 84.00 - 51.46 exp(-0.00679 PAR); NKT: weight per seed = 68.14 - 27.96 exp(-0.04546 PAR)

View larger version (24K): [in a new window]   Fig. 5 Oil concentration as a function of cumulative PAR intercepted from treatment application to physiological maturity, in hybrids G-100 and NKT, Exp. A, B and C. The equations are: G-100: oil concentration = 514 - 134 exp(-0.0275 · PAR); NKT: oil concentration = 431 (Exp. A and B averages) and oil concentration = 403 (Exp. C average)