Greenhouse Gas Emissions Associated with Nile Tilapia (Oreochromis niloticus) Pond Fertilization in Western Kenya

Table 2

Mean physicochemical parameters from unfertilized, organic fertilized, and inorganic fertilized Nile tilapia fish ponds over 6 months (with range in parenthesis).

Parameters	UF mean ± SD	IF mean ± SD	OF mean ± SD	value	NEMA STDS
Physical
Temp. (°C)	26.82 ± 1.96^a (23.39–29.58)	26.50 ± 2.04^a (22.69–30.40)	26.60 ± 2.30^a (22.22–30.07)	0.899	20–35
pH	7.70 ± 0.66^a (6.50–8.78)	7.46 ± 1.26^a (4.80–8.78)	7.67 ± 0.73^a (6.00–8.90)	0.697	6.5–8.5
Chemical
DO (mgl^−1)	4.23 ± 1.36^a (2.40–6.88)	4.79 ± 1.52^a (2.20–6.60)	4.47 ± 1.57^a (2.60–7.48)	0.529	>4
Cond. (µs/cm)	85.28 ± 29.74^a (48.00–157.00)	90.39 ± 26.47^a (49.00–130.00)	78.90 ± 16.7^a (46.00–101.00)	0.390	—
CN ratio	14.45 ± 3.94^a (11.67–29.33)	19.22 ± 6.04^ab (10.67–28.50)	18.57 ± 6.00^b (10.06–29.33)	0.025	—

Means in a row with the same superscripts indicate no significant difference at 5%.