Aquaculture Research

Research Article

Effects of Chemical Fertilizer Application upon the Water Quality Parameters of a Rice–Eel (Monopterus albus) Coculture System

Table 3

Pearson correlations between the physical-chemical properties of rice field’s surface water and ring ditch water. DO: dissolved oxygen, T: temperature, TN: total nitrogen, TP: total phosphorus, TAN: total ammonia nitrogen, NO₂⁻-N: nitrite nitrogen, COD: chemical oxygen demand.


		DO	T	TN	TP	TAN	NO₂⁻-N	COD

pH	r	0.540	0.344	−0.052	0.079	−0.162	0.030	0.053
pH	p	0.000	0.000	0.530	0.337	0.048	0.719	0.519
DO	r		0.501	−0.149	0.054	−0.243	0.031	−0.028
DO	p		0.000	0.070	0.511	0.003	0.704	0.739
T	r			−0.213	−0.095	−0.194	0.130	−0.169
TN	p			0.009	0.246	0.018	0.113	0.040
	r				0.532	0.882	−0.102	0.096
	p				0.000	0.000	0.214	0.244
TP	r					0.503	−0.142	−0.026
TP	p					0.000	0.082	0.755
TAN	r						−0.092	0.089
TAN	p						0.264	0.282
NO₂⁻-N	r							−0.256
NO₂⁻-N	p							0.002

Note. Coefficients marked in bold type are significant; denotes ; denotes . Bold values indicate a significant correlation between the two indicators, negative values indicate a significant negative correlation, and positive values indicate a significant positive correlation.