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Tizkar B.,Higher Education Fisheries Research | Seidavi A.,Islamic Azad University at Rasht | Sudagar M.,Gorgan University of Agricultural Sciences and Natural Resources | Ponce-Palafox J.T.,Autonomous University of Nayarit
Phyton | Year: 2014

The aim of this study was to determine the effect of a granular or liquid fertilizer on the temporal variation of phytoplankton. Enrichment of the pond water with nitrogen and phosphorus resulted in an increased gross photosynthesis and biomass of the dominant algal species. Nutrient concentrations and dilution rates can determine the temporal variation in phytoplankton abundance and primary production. The variation may be largely maintained by nutrient regeneration or turnover from different forms © 2014, Fund Roulo Raggio. All rights reserved.

Tizkar B.,Higher Education Fisheries Research | Seidavi A.R.,Higher Education Fisheries Research | Seidavi A.R.,Islamic Azad University at Rasht | Sudagar M.,Higher Education Fisheries Research | And 3 more authors.
Bangladesh Journal of Botany | Year: 2014

Under the experimental pond condition, three treatments of fertilizers on phytoplankton were carried out. The first treatment was with granular fertilizers (GF), and the second and third treatments were with liquid fertilizer A (LFA), low concentration and liquid fertilizer B (LFB), high concentration, respectively. The mean pH and the average transparency of the water varied significantly among different treatments (p < 0.05). Gross and net productivity in the LFB-treated ponds were higher than those observed in the two other treatments (p < 0.05). In addition, the bacillariophytes did not change significantly among treatments (p < 0.05). However, the chlorophytes increased in the LFB treatment, and the cyanophytes were increased in the GF treatment (p < 0.05).

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