1. ATKINSON, D. (1977). Some observations on the root growth of young apple trees and their uptake of nutrients when grown in herbicidal strips in grassed orchards, Plant and Soil, 49, 459–471
2. BUSHONG, J. W., GATES, D. W. and SULLIVAN, T. P. (1976). Mefluidide — a new concept in weed control with a plant growth regulator, Proceedings 7976 British Crop Protection Conference — Weeds, pp. 695–698
3. CLAY, D. V. (1980). The use of separate root and shoot tests in the screening of herbicides for strawberries, Weed Res., 20, 97–102
4. DAVISON, J. G. and BAILEY, J. A. (1979). Black polythene for weed control in young fruit and other perennial crops, ARC Research Review, British Growers Look Ahead Issue, pp. 11–14 (also see Parfitt et al., Chapter 11)
5. FRYER, J. D. and MAKEPEACE, R. J. (eds.) (1978). Weed Control Handbook, vol. 2, Recommendations, Blackwell, Oxford, 532 pp.