Vol. 69 No: 5

Title:
Flower Initiation and Node Development of Axillary Buds, Growth Partitioning, and Bleeding Sap Production of Young Apple Trees as Affected by Fertigation

Authors:
I. DENCKER and P. HANSEN

pp: 869-876

Abstract:
Node and flower development in axillary buds of one year old ‘Elshof’ trees, growth and dry-matter partitioning, and bleeding sap production were examined in unfertigated field-grown trees as well as in fertigated field- and pot-grown trees. Flower initiation in axillary buds was delayed by approximately 40 d as compared with spur buds, and the critical node number within the bud was only 14 or 15 against 19 nodes in spur buds. Fertigated trees exhibited increased node development, axillary flower-bud densities, extension shoot growth and trunk increments, and decreased root/top ratios. The seasonal shoot development was markedly hastened in fertigated trees, and the amount of bleeding sap was increased. Especially, trees fertigated in pots, using a nitrogen application range of 14 to 420 ppm N, had high bleeding sap concentrations of nitrogen, phosphorus and calcium. Flower-bud initiation of apple is discussed in terms of bud development, shoot growth and root activity.

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