8Perez M E, Camacaro D E, Camacaro G J, et al. Effect of plant density and initial crown size on growth, development and yield in strawberry cultivars Elsanta and ' Bolero' . The Jour- nal of Horticultural Science and Biotechnology, 2004, 79 (5) : 739-746.
9Ahmad M F. Effect of planting density on growth and yield of strawberry. Indian Journal of Horticulture, 2009, 66 ( 1 ) : 132-134.
10Vang-Petersen O. Influence of raised beds, plant density and fertilization on yield and quality of strawberry (Fragaria ananassa Duch. ) . European journal of horticultural science, 1998, 63:19-22.