Soil Quality and Pomelo Productivity as Affected by Chicken Manure and Cow Dung

Table 6

Principal component matrix in the topsoil layer (0–20 cm).

Principal components	PC1	PC2	PC3
pHH2O (1 : 2.5)	0.096	0.902	0.018
EC (mS cm^−1)	−0.195	−0.033	0.957
Soil organic matter (%)	0.958	−0.081	0.031
Exchangeable Ca^2+ (meq 100g^−1)	0.589	0.505	0.206
Exchangeable K^+ (meq 100g^−1)	0.508	−0.585	0.071
Exchangeable Mg^2+ (meq 100g^−1)	0.762	−0.133	0.259
Bulk density (g cm^−3)	−0.843	−0.225	0.067
Total nitrogen (g kg^−1)	0.955	−0.025	−0.019
Available phosphorus (mg kg^−1)	0.929	−0.021	−0.111
Fruit yield (t ha^−1)	0.953	−0.064	−0.024
Total	5.54	1.49	1.05
Percentage of variance	55.4	14.9	10.5
Cumulative percentage variance	55.5	70.4	80.6