Table 6 Path analysis showing direct and indirect effects of NAH15N, AA15N, AHA15N, AS15N and AHU15N on residual exogenous-15N in paddy soil at different growing stages of rice plants.

From: The role of Chinese Milk Vetch as cover crop in complex soil nitrogen dynamics in rice rotation system of South China

Variables

Direct coefficients

Indirect coefficients

x1

x2

x3

x4

x5

x6

Total

Tillering stage

x2

0.502**

0.162

ā€”

āˆ’0.001

0.634

āˆ’0.225

āˆ’0.088

0.482

x4

0.667*

0.189

0.477

āˆ’0.005

ā€”

āˆ’0.234

āˆ’0.115

0.312

Booting stage

x1

0.576**

ā€”

0.105

0.163

āˆ’0.066

0.009

āˆ’0.180

0.031

x2

0.555**

0.109

ā€”

0.073

0.019

0

0.133

0.334

Maturing stage

x1

1.038**

ā€”

0.509

āˆ’0.520

āˆ’0.059

0.017

āˆ’0.003

āˆ’0.055

x2

0.567**

0.933

ā€”

āˆ’0.426

āˆ’0.098

0.017

āˆ’0.005

0.420

x3

āˆ’0.555*

0.990

0.434

ā€”

āˆ’0.021

0.016

0.001

1.420

x4

āˆ’0.142ā€‰ns

0.433

0.391

āˆ’0.081

ā€”

āˆ’0.008

āˆ’0.009

0.726

  1. 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); ā€œ * and **ā€ indicate significant differences at Pā€‰<ā€‰0.05 and Pā€‰<ā€‰0.01, respectively, ā€œnsā€ means no significant difference at Pā€‰<ā€‰0.05.
Back to article page