Reduction of strawberry plants density grown on substrate in a greenhouse may guarantee efficiency and yield
The leaf expansion of strawberries is associated with air temperature, influencing the appearance of the leaves given by phyllochron, which is related to the productivity. Thus, the objective of this research was to test whether the appearance of leaves and strawberry fruits production grown on substrate are affected by plant density. The experiment was conducted from August to December 2009, in Passo Fundo - RS, using a randomized blocks design (RBD). The treatments were plant densities: (1) 6 plants, 0.30×0.30 m; (2) 9 plants, 0.20×0.20 m; (3) 12 plants, 0.15×0.15 m; (4) 15 plants, 0.12×0.12 m and (5) 18 plants, 0.10×0.10 m, with four replications. The plant densities showed no significant difference on phyllochron. The mean and standard deviation of phyllochron of strawberry in the five densities varied from 215.32±48.45°C day leaf-1 in the density of 12 plants m-2 to 140.05±38.61°C day leaf-1 with 9 plants m-2. It was observed that the density 3 required higher temperature accumulation (215.32°C day-1) to successive leaf emission. The highest total fruits mass (6.80±1.15 kg m-2) was obtained using 18 plants m-2. Therefore, reducing the spacing between plants of strawberry (cultivar 'Albion') does not affect the phyllochron, nevertheless ensures greater efficiency and productivity.
Costa, R.C., Calvete, E.O., Mendonça, H.F.C., Antoniolli, R., Chiomento, J.L.T., Basso, R., Demarco, S., Pedersen, A.C., Trentin, N.S. and De Nardi, F.S. 2017. Reduction of strawberry plants density grown on substrate in a greenhouse may guarantee efficiency and yield. Acta Hort. (ISHS) 1170:715-720
Fragaria × ananassa Duch, phenology, thermal time, soilless cultivation, seedlings