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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.
