Table 5 Correlation between AH¹⁵N, NAH¹⁵N, AA¹⁵N, AHA¹⁵N, AS¹⁵N, AHU¹⁵N and residual exogenous ¹⁵N in paddy soil at different growing stages of rice plants under flooded condition (n = 9).

Variables	Residual ¹⁵N	x₁	x₂	x₃	x₄	x₅
Tillering stage
Residual ¹⁵N	1
x₁	0.800^**	1
x₂	0.984^**	0.714^*	1
x₃	−0.0517 ^ns	−0.223 ^ns	−0.0288 ^ns	1
x₄	0.979^**	0.835^**	0.951^**	−0.160 ^ns	1
x₅	0.982^**	0.834^**	0.960^**	−0.127 ^ns	0.998^**	1
x₆	0.631 ^ns	0.886^**	0.562 ^ns	−0.365 ^ns	0.734^*	0.736^*
Booting stage
Residual ¹⁵N	1
x₁	0.607 ^ns	1
x₂	0.888^**	0.189 ns	1
x₃	−0.776^*	−0.954^**	−0.422 ^ns	1
x₄	−0.203 ^ns	−0.899^**	0.257 ^ns	0.748^*	1
x₅	−0.314 ^ns	−0.700^*	0.00195 ^ns	0.702^*	0.702^*	1
x₆	−0.100 ^ns	0.720^*	−0.533 ^ns	−0.534 ^ns	−0.945^**	−0.677^*
Maturing stage
Residual ¹⁵N	1
x₁	0.963^**	1
x₂	0.979^**	0.899^**	1
x₃	0.855^**	0.954^**	0.766^*	1
x₄	0.596 ^ns	0.417 ^ns	0.690^*	0.146 ^ns	1
x₅	0.977^**	0.980^**	0.932^**	0.915^**	0.465 ^ns	1
x₆	0.375 ^ns	0.221 ^ns	0.429 ^ns	−0.0477 ^ns	0.803^**	0.213 ^ns

x₁ represents acid hydrolysable-¹⁵N (AH¹⁵N); x₂ represents non-acidhydrolysible-¹⁵N (NAH¹⁵N); x₃ represents amino acid-¹⁵N (AA¹⁵N); x₄ represents hydrolysible ammonium-¹⁵N (AHA¹⁵N); x₅ represents amino sugar-¹⁵N (AS¹⁵N); x₆ represents hydrolysible unidentified-¹⁵N (AHU¹⁵N); “ * and **” indicate significant differences at P < 0.05 and P < 0.01, respectively, “ns” means no significant difference at P < 0.05.

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