5Thompson L, Harpper J L. The effect of grasses on the quality of transmitted radiation and its influence on the growth of white clover Trifolium repens[J]. Oecologia, 1988, (75) : 343-347.
6Thompson L. The influence of the radiation environment around the node on morphogenesis and growth of white clover (Trifolium repens)[J].Grass and Forage Science, 1993, (48) : 271-278.
7Schwinning S, Parsons A J. Analysis of the coexistence mechanisms for grasses and legumes in grazing systems [J]. Journal of Ecology, 1996, (84),799-813.
8Volenec J J, Nelson C J. Responses of tall rescue leave meristem to N fertilization and harvest frequency[J]. Crop Science, 1983, (23) : 720-724.
9Nassiri M, Elgersma A. Competition in perennial ryegrass-white clover mixtures under cutting. 2.Leaf characteristics, light interception and drymatter production during regrowth[J]. Grass and Forage Science, 1998, (53) : 369-379.
10Cowling D W, Lockyer D R. Acomparison of the reaction of different grass species to fertilizer nitrogen and to growth in association with white clover I. Yield of dry matter[J]. Journal of the British Grassland Society, 1965, (20) : 197-204.
