Abstract
Summary The effect of hydrophilic polymers on newly planted trees and shrubs is one of the most confused areas of establishment research, with many papers reporting benefits where others show no effect or even suggest that the polymers may be harmful. Trials were carried out to try to identify the potential causes of such variation. To minimise genetic variation two cultivars of shrubs were compared Deutzia scabra Thunb. ‘Pride of Rochester’ and Ligustrum ovalifolium Hassk. ‘Aureum’. These were planted as liners either in containers or directly into sandy loam soil. Both growing media were amended with the rates of 0, 1, 1.5, 1.75 g l−1 dry polymer. The container plants underwent a controlled watering regime in a polythene tunnel and were only watered when wilting became apparent. Watering frequency, pot weight at field capacity, total water demand and also leaf numbers and plant heights were recorded over the time of the experiment. The leaf area, root dry weights and shoot dry weights were recorded at t...
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