Efecto del fotoperiodo y el uso de un nutriente foliar comercial en el crecimiento (Biomasa) de Pyropia sp. CHI “Cochayuyo” bajo condiciones controladas de cultivo

Abstract

In order to determine the effect of photoperiod and the addition of commercial foliar nutrient at different concentrations in the biomass increasing of Pyropia sp. CHI, gametophytic individuals were collected in Santa Elena beach, Paracas - Pisco and transferred to Applied Biology Laboratory of Universidad Nacional Agraria La Molina. The thalli were divided into groups of 1,0 ± 0,02 g of initial biomass and placed in flasks with enriched sea water with three different concentrations of Bayfolan® commercial foliar nutrient (0,1 ml/L; 0,05 m/L; and 0,025 ml/L) and a control treatment (0 ml/L) against two photoperiod conditions: long day (DL) (L/O = 18:6) and short day (DC) (L/O = 6:18). Biomass (wet weight) and growth rate (g/week) were evaluated weekly during six weeks. The results have demonstrated the effect of nutrient addition in biomass increase of Pyropia sp. CHI where all treatments with added nutrient, for both DC and DL, obtained significantly higher growth rates (p <0,05) than treatment without nutrient addition (0 ml/L). Likewise, a higher biomass was obtained for DL condition with 1,53 g (0 m/L); 2,98 g (0,025 ml/L); 3,28 g (0,05 ml/L) and 3,57 g (0,1 ml/L) unlike that obtained in DC condition with 1,42 g (0 ml/L); 2,79 g (0,025 ml/L); 2,66 g (0,05 ml/L) and 2,65 g (0,1 ml/L) (p ><0,05).