Leaf Calcium and Sorbitol in ‘Delicious’ Apple Trees as Influenced by Herbicides and Nitrogen Levels1
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Abstract The effect of combinations of soil-applied paraquat and simazine and 3 levels of supplemental ammonium nitrate on leaf calcium and sorbitol was determined in ‘Delicious’ apple trees ( Malus domestica Borkh.). Levels of leaf calcium were significantly lower in plots treated with simazine + paraquat than with paraquat alone for all levels of nitrogen. Leaf size was significantly related to levels of sorbitol in the wood and bark, and sorbitol content of 2-year-old shoots was significantly related to leaf calcium levels.
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Abstract The effect of combinations of soil-applied paraquat and simazine and 3 levels of supplemental ammonium nitrate on leaf calcium and sorbitol was determined in ‘Delicious’ apple trees ( Malus domestica Borkh.). Levels of leaf calcium were significantly lower in plots treated with simazine + paraquat than with paraquat alone for all levels of nitrogen. Leaf size was significantly related to levels of sorbitol in the wood and bark, and sorbitol content of 2-year-old shoots was significantly related to leaf calcium levels.
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