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CROP BREEDING, GENETICS & CYTOLOGY

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

^* Corresponding author (d.greenwood{at}warwick.ac.uk)

Better criteria for selecting cultivars for their ability to grow well on low-P soils could reduce waste of fertilizer P. The objective of this study was to quantify and determine the reproducibility of two crop parameters (A and K_m) responsible for differences in the response of 12 Brassica oleracea L. genotypes to P supply. Modified Michaelis–Menten equations were fitted to shoot dry weight responses to P supply for each genotype in each of three glasshouse and three field experiments. One of the fitted parameters (A) defined the maximum shoot dry weight that could be obtained with ample P, and the other (K_m) defined the efficiency of root P-uptake as the concentration of extractable soil P in the rooting medium at which growth was half the maximum. The equations fitted the data well. Ranking and regression analyses showed that intergenotypic differences in A were considerable, and reproducible, but that differences in K_m were small. Thus, B. oleracea genotypes yielding most on a P-sufficient soil will also yield most on a P-deficient soil. However, both the maximum yield (A) and the efficiency of root-P uptake (K_m) vary considerably between different vegetable crops. Thus, a graphical procedure to select crops for highest yields on low-P soils, on the basis of a comparison of A and K_m values, is described.

Abbreviations: A, maximum possible plant dry weight with sufficient P • B, the gradient of W against P_x when P_x0 • CC, coefficient of concordance • F1, F2, F3, field experiments 1, 2, and 3 • G1h1, glasshouse experiment 1 harvest 1 • G1h2, glasshouse experiment 1 harvest 2 • G2, glasshouse experiment 2 • G3, glasshouse experiment 3 • K_m, the concentration of extractable soil P in the rooting medium at which growth is half the maximum • K₂, a growth rate coefficient • No., number of measurements in each experiment • P_e, a measure of the extractable soil P in unfertilized potting-mix • P_f, fertilizer P • P_s, the Olsen extractable soil P • PUE, phosphorus use efficiency • P_x, the concentration of extractable soil P in the rooting medium • W, total plant dry weight exclusive of fibrous roots

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Crop Science 2005 45: x. [Full Text]  

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