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Effects of Floating Agriculture Practice on the Water Body of Pond and Canal (2019-2020)

S. S. A. Kamar
SO
IWM Division, BARI, Gazipur

M. A. Hossain
CSO and Head
IWM Division, BARI, Gazipur

D. K. Roy
SSO
IWM Division, BARI, Gazipur

K. F. I. Murad
SO
IWM Division, BARI, Gazipur

M. M. R. Talukder
PSO
RARS, BARI, Gazipur

Abstract/ Executive Summary:

This experiment was conducted at RARS, Rahmatpur, Barishal to determine the change of water quality of canals for cultivating fish and household uses and to determine the change of water quality of ponds for cultivating fish and household uses. The water samples were collected from three selected ponds of RARS, Rahmatpur, Barishal. The selected ponds were mentioned as FL-1 (Floating Agriculture practiced since 2015), FL-2 (Floating Agriculture practiced since 2018) and F (Fresh Pond). The water quality parameters were analyzed from TCL and Soil Lab, BRAC, Gazipur. It was not possible to collect water samples in the months of March, April and May due to lockdown. For all three ponds the water temperature was observed below 310C in all months which was good for fish cultivation. The pH level was found high (6.95-8.04) in the months of January and February, 2020 which was little harmful for carp fish cultivation. The pH level higher than 8.5 and lower than 5 is harmful for household uses. It was observed that the (UIA) Un Ionized Ammonia level at all selected ponds were suitable for channel catfish but not suitable for salmonid and craps. The total dissolved solids (TDS) were in desirable limit but in case of floating agriculture practice ponds (FL-1 and FL-2) the TDS level was found higher than fresh pond (F). The Ca levels were in affordable range for only channel fish cultivation. The P values were good for plankton/shrimp production but the P value was crossed the limit in floating agriculture practiced ponds for other fish production. It was observed that the nitrate values in the month of January, February and June were in tolerable limit. But in the month of July the nitrate level is exceeding the limit of fish cultivation. Nitrate in excess of 45 mg/L (or in excess of 10 mg/L if reported as nitrate-nitrogen) is of health significance to pregnant women and infants under six months.

Keywords: Water quality, Canals, Cultivating fish, Household, Quality of ponds

Location: RARS, Rahmatpur, Barishal, Bangladesh

Start Date: 00-00-2019

End Date: 00-00-2020

Program Area: Farming System

Commodity: Floating agriculture

Objectives:

Objectives of the experiment were given below:

* To determine the change of water quality of canals for cultivating fish and household uses and;

* To determine the change of water quality of ponds for cultivating fish and household uses

Methodology:

The experimental water samples were collected from Regional Agricultural Research Station, Rahmatpur, Barishal. Three water samples were collected from three selected ponds of Regional Agricultural Research Station, Rahmatpur, Barishal. The two samples were collected from floating agriculture practice ponds and one sample was collected from a fresh pond. The treatments of the experiment were given below FL-1 = Floating Agriculture Practice as well as fish culture since 2015. FL-2 = Floating Agriculture Practice as well as fish culture since 2018. F = Fresh Pond The water quality parameters of the collected samples were analyzed at TLC and soil lab of BARDC, Gazipur. The water quality parameters were given below 1. Potassium (k) 2. Sodium (Na) 3. Phosphorus (P) 4. Ammonium (NH4) 5. Nitrate (No3) 6. Carbonate (CO3) 7. Bicarbonate (HCO3) 8. pH 9. Sulphur

Source of Information: Annual Research Report 2019-2020, Irrigation and Water Management Division, BARI, Joydebpur, Gazipur

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

It was observed that the (UIA) Un Ionized Ammonia level at all selected ponds were suitable for channel catfish but not suitable for salmonid and craps. The total dissolved solids (TDS) were in desirable limit but in case of floating agriculture practice ponds (FL-1 and FL-2) the TDS level was found higher than fresh pond (F). The Ca levels were in affordable range for only channel fish cultivation. The P values were good for plankton/shrimp production but the P value was crossed the limit in floating agriculture practiced ponds for other fish production. It was observed that the nitrate values in the month of January, February and June were in tolerable limit. But in the month of July the nitrate level is exceeding the limit of fish cultivation. Nitrate in excess of 45 mg/L (or in excess of 10 mg/L if reported as nitrate-nitrogen) is of health significance to pregnant women and infants under six months. This is the first year experiment. It is needed to continue for next 3 to 4 years for making a concrete result.

Knowledge Management: Report/Proceedings