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Phosphorus Response Components of Different Brassica oleracea Genotypes Are Reproducible in Different Environments

^a Warwick HRI, Wellesbourne, Warwick CV35 9EF, UK
^b Dep. of "Scienze delle Produzioni Vegetali", Univ. of Bari, via Amendola 165/a, 70126 (BA), Italy
^c Univ. of Nottingham, Sutton Bonington, Loughborough LE12 5RD, UK

View larger version (21K): [in a new window]   Fig. 1. Shoot dry weight response to P, as a fraction of the maximum possible shoot dry weight for the most and least responsive B. oleracea genotypes in two experiments (F2 and G3). Values were obtained by fitting Eq. [3] to the data. Ps is the Olsen extractable soil P, Pf is the fertilizer-P application, and Pe is a measure of the plant available P in the potting mix from which P fertilizer was withheld.

View larger version (22K): [in a new window]   Fig. 2. (a) Relationship between values of A for different B. oleracea genotypes averaged over all glasshouse experiments and those averaged over all field experiments. (b) Relationship between K2 for different B. oleracea genotypes averaged over all glasshouse experiments and K2 averaged over field experiments F1 and F2 (K2 could not be calculated for F3 because of the absence of transplant weights). Numbers refer to the genotypes A12DHd (1), B188908 (2), borecole (3), brocolli (4), CA25 (5), Dutch white cabbage (6) cauliflower (7), GD33 (8), kohlrabi (9), Oriental kale (10), Savoy (11), and Brussel sprouts (12). Data for B188908 and Oriental kale were not available for the field experiments as these genotypes failed in one or another field experiment.

View larger version (19K): [in a new window]   Fig. 3. Relationship between the fitted values of B and A for B. oleracea genotypes in glasshouse experiments G2 and G3. Only data where fitted values of B had a SE < 0.0353 (Mg ha–1/mg–1 L) are plotted. The relationship covered all genotypes except A12DHd and Oriental kale as the SE of B was high for these genotypes.

View larger version (19K): [in a new window]   Fig. 4. Relationships between the fitted values of B for different B. oleracea genotypes and their corresponding values of A, averaged over three field experiments (a) or over glasshouse experiments G2 and G3 (b). Genotypes B188908 and Oriental kale are absent from (a), as these crops failed in one or other experiment. Oriental kale is the outlier in (b). Numbers refer to the genotypes A12DHd (1), B188908 (2), borecole (3), brocolli (4), CA25 (5), Dutch white cabbage (6) cauliflower (7), GD33 (8), kohlrabi (9), Oriental kale (10), Savoy (11), and Brussel sprouts (12).

View larger version (19K): [in a new window]   Fig. 5. Values of B and A for different vegetable crops obtained by fitting Eq. [3] with Px = 40 + Pf (kg P ha–1) to measurements for their harvestable parts (derived from Greenwood et al., 1980). Zone 1 includes only summer cabbage. Zone 2 includes carrot, leek, and autumn sown onion; Zone 3 includes broad beans, French beans, lettuce, spinach, and spring sown onion; Zone 4 includes Brussel sprouts, calabrese, parsnip, pea, potato, radish, summer cauliflower, sugar beet (sugar), turnip (roots), and winter cabbage.