Abstract
Clonal lines of five potato cultivars were grown in four locations differing in soil types. The effects of locations and cultivars on the phosphorus fractions of the tubers were determined. Large differences were found in total and inorganic phosphorus. Within the organic phosphorus fraction, greatest variability was found in phytic acid and in starch associated phosphorus. With respect to components of variation, the locality appeared to be the dominant factor in determining levels of total, inorganic and phytic acid phosphorus. The cultivar contribution to these fractions was also significant. Starch-associated phosphorus appeared to be affected by locality and cultivar to about the same degree. However, nucleic acid phosphorus and lipid phosphorus were not affected by either locality or cultivar.
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