Abstract
Early-maturing potato cultivars had large concentrations of calcium in their leaves but late-maturing cultivars had smaller concentrations because they formed more new leaves and calcium arriving in their tops was distributed through more leaf tissue. Mild water stress decreased growth and calcium concentration in leaves and increased the efficiency of water use which was also increased by nematode attack but only during the first weeks after planting. Growth was eventually much reduced and water use became very inefficient. Total calcium uptake was a good indicator of total water used by plants but nematode-infested plants took up more calcium per unit amount of water transpired. Coupled with inefficient water use, this means that infested plants contained significantly greater concentrations of calcium than uninfested plants.
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