Influence of cultivation densities and harvesting rates on the environmental parameters, growth and productivity of eelgrass, Vallisneria spiralis
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Abstract
This study was conducted to evaluate effects of planting density and harvest rate on the growth and yield of eelgrass (Vallisneria spiralis). Experiment 1 aimed to evaluate the effects of different planting densities including three treatments of eelgrass planting density with three repetitions: 1) 0.25 kg/m2; 2) 0.50 kg/m2 and 3) 0.75 kg/m2. The results showed that the growth rate (3210 mg/day) and increase in biomass (83 g) when planted at a density of 0.50 kg/m2 were similar to those when planted at a density of 0.75 kg/m2 (P > 0,05), however, the yield was high (0.896 kg/m2) when eelgrass was planted at a density of 0.75 kg/m2. Experiment 2 evaluated effects of different harvest rates, including 4 treatments and was also repeated 3 times per each treatment: No harvest and harvest 15, 25, 35% total biomass/time after every 15 days of planting. The results of the 15 and 25% harvest rates did not differ in growth and yield of eelgrass (P > 0.05), however, the 35% harvest rate clearly reduced growth rate, biomass increase and productivity of V. spiralis.
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References
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