Abstract
`Vates' is more susceptible to tipburn than `Blue Max' or `Heavi Crop' when grown under high temperature conditions. Nutrient solution culture studies were conducted to determine the influence of cultivar and Ca level in the nutrient solution on Ca uptake and distribution in the plant and to determine the physiological basis for differences in cultivar susceptibility to tipburn. Ca levels in the nutrient solution were 1 and 4,5 mM. Studies were conducted in the greenhouse at 32C during the day and 21C at night. Collard plants were 3 weeks old when the study was initiated. Cultivar and Ca level had no influence on Ca uptake during the first two weeks of the study. Ca uptake by `Blue Max' was greater than by `Vates' or `Heavi Crop' during the 3rd, 4th and 5th weeks of the study. Ca uptake for `Blue Max' was 73 ppm/week whereas for `Vates' and `Heavi Crop' it was 55 and 46 ppm/week, respectively during the 5th week of the study. Increasing the Ca level increased the Ca content of young leaves more for `Blue Max' than for `Vates' or `Heavi Crop'. Ca content of the petiole and stem was higher for `Blue Max' than for `Vates' or `Heavi Crop'. The influence of cultivar and nutrient solution Ca level on uptake and distribution of other nutrients will be discussed.
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