Abstract
Young trees of apple rootstock MM.104 were supplied with ammonium nitrate (0.4 g in 100 ml water) via the soil at selected times during the annual growth cycle. Appreciable amounts of nitrogen were taken up within 40 h in summer and autumn, leading to increases in the soluble nitrogen fraction. Corresponding changes were not detected in the insoluble nitrogen fraction. The increases in soluble nitrogen were not dependent on carbohydrate status, plant size, root mass or on whether or not shoot extension had ceased. Amounts of increase were profoundly influenced by prior nitrogen status as modified by a small pre-treatment boost of ammonium nitrate given in July.
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