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Effect of Fertilization on Plankton Production in Ponds

M.A. Hossain
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

M.J.U. Miah
Department of Aquaculture, Bangladesh Agricultural University,Mymensingh-2202, Bangladesh

M. Das
Department of Aquaculture,Bangladesh Agricultural University,Mymensingh-2202,Bangladesh

Abstract/ Executive Summary:

The experiment was conducted for a period of eight weeks to find out the effect of fertilization on plankton production. Four treatments namely T_o (control), T₁ (urea : 98.800 kg/ha), T₂ (cowdung : 8645 kg/ha) & T₃ (combination of urea and cowdung) were replicated in duplicate. Fertilization was done fortnightly. Four groups of phytoplankton namely Cyanophyceae, Euglenophyceae, Chlorophyceae and Bacillariophyceae and four groups of zooplankton namely Rotifer, Copepod, Cladoceran and Nauplius larvae were encountered in the present study. Chlorophyceae and Rotifer were found to be the most dominant groups over the different groups of phytoplankton and zooplankton respectively. The maximum abundance of phytoplankton was recorded with the treatment T₁ whereas the maximum abundance of zooplankton was found with the treatment T₂. A moderate abundance of both phytoplankton and zooplankton production were observed with the treatment T₃. A significantly greater (P<0.05) production of plankton was found in all the fertilizer treated ponds than that of the control ponds.

Keywords: Fertilizers, Phytoplankton, Zooplankton

Location: Bangladesh Agricultural University, Mymensingh

Start Date: 09-10-1995

End Date: 08-12-1995

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer

Objectives:

To find out the effects of cowdung, urea and cowdung plus urea on the qualitative and quantitative production of plankton of the ponds.

Methodology:

The present experiment was conducted for a period of eight weeks (9 th October, 1995 to 8th December, 1995) in rectangular ponds each with an area of 0.004 hectare having average water depth of one meter, situated at tile south-west corner of the Faculty of Fisheries Building, Bangladesh Agricultural University, Mymensingh. Ponds were at first cleared off of aquatic vegetation manually. Predators and fishes were also removed by repeated netting. Then the ponds were treated with lime at a dose of 247 kg per hectare before ten days of fertilization. Four treatments (T₀ , T₁ , T₂ and T₃) were replication in duplicate. Treatment T ₁ was assigned to the ponds treated with inorganic fertilizer (Urea: 98.800 kg/ha.): treatment T₂ was assigned to the ponds treated with organic fertilizer (Cowdung: 8645 kg/ha.); treatment T₃ was assigned to the ponds treated with a combination of inorganic and organic fertilizer (Urea: 98.800 kg/ha. + Cowdung: 8645 kg/ha.) and treatment To was kept as control (without treating any fertilizer). Urea was applied into the ponds by spreading method whereas Cowdung was applied into the ponds as a slurry on wet weight basis. Fertilization was done fortnightly. Twenty liters of water samples were collected at every fortnight just before successive fertilization for plankton study.

Source of Information: Bangladesh J. Agril. Sci. 26(1): 33-36, January, 1999

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Four groups of phytoplankton namely Cyanophyceae, Euglenophyceae, Chlorophyceae and Bacillariophyceae and four groups of zooplankton namely Rotifer, Copepod, Cladoceran and Nauplius larvae were encountered in the present study. Chlorophyceae and Rotifer were found to be the most dominant groups over the different groups of phytoplankton and zooplankton respectively. The maximum abundance of phytoplankton was recorded with the treatment T₁ whereas the maximum abundance of zooplankton was found with the treatment T₂. A moderate abundance of both phytoplankton and zooplankton production were observed with the treatment T₃. A significantly greater (P<0.05) production of plankton was found in all the fertilizer treated ponds than that of the control ponds.

Knowledge Management: Journal