Table 1 Linear model analyzing the trend of soil total and available P content changing with experimental years (1981–2015).

From: Substituting chemical P fertilizer with organic manure: effects on double-rice yield, phosphorus use efficiency and balance in subtropical China

Treatment

Soil total P

Soil available P

Slope

R2

P

Slope

R2

P

CK

− 0.003

0.624

 < 0.001

− 0.220

0.843

 < 0.001

NK

− 0.001

0.118

 < 0.05

− 0.162

0.584

 < 0.001

NPK

0.007

0.587

 < 0.001

0.059

0.052

0.182

NKM

0.001

0.03

0.311

− 0.128

0.573

 < 0.001

  1. The slope is the average increase of soil total or available P content with year. R is the coefficient of the correlation between the soil total or available P content and the experimental year. CK: unfertilized control; NK: mineral fertilizer NK; NPK: mineral fertilizer NPK; NKM: mineral fertilizer NK combined with pig manure.
Back to article page