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Agronomic Performance of Different Pea Cultivars Under Various Sowing Periods and Contrasting Soil Structures

UMR 211 Agronomie, INRA AgroParisTech, BP 01, 78850 Thiverval-Grignon, France

View larger version (35K): [in this window] [in a new window]   Fig. 1. Proportion of the plowed layer with clods in the four experiments according to soil structure (UC: uncompacted; C: compacted) and sowing date (EF: early fall; LF: late fall; LW: late winter). Treatments with the same letter above the bars are not significantly different (P < 0.05) within an experiment.

View larger version (15K): [in this window] [in a new window]   Fig. 2. Aboveground dry biomass (BM, t ha–1) according to the number of days after sowing. (A) Exp. 3 uncompacted LF Cheyenne, R2 = 0.98; (B) Exp. 4 uncompacted LW Dove, R2 = 0.99. The points represent the observed values per replicate and the curve is the fitted curve of the beta growth function. BF = beginning of flowering; FSSA = final stage in seed abortion; PM = physiological maturity; BMmax = maximum value of BM; te = time when BMmax is reached; tm = abscissa of the inflection point at which the growth rate reaches its maximum value; cm = growth rate at tm. An asterisk indicates the parameters that were experimentally determined.

View larger version (23K): [in this window] [in a new window]   Fig. 3. Relationships between seed yield (SY, t ha–1) and (A) seed number m–2 (SN) and (B) mean seed dry weight (SDW, g seed–1) for each cultivar in all experiments.

View larger version (20K): [in this window] [in a new window]   Fig. 4. Relationship between mean cultivar seed dry weight (SDW, g seed–1) and Ngunit (seeds g–1 degree-day–1). The regression line was calculated using the data of the five cultivars: Baccara, Cheyenne, Dove, Frisson, and Solara. Vertical bars are the standard deviation of Ngunit.