Research Article
Compost and Biochar to Promote Soil Biological Activities under Sweet Potatoes Cultivation in a Subtropical Semiarid Region
Table 2
Correlation matrix between sweet potato performance and soil attributes.
| | Root yield | Biomass | pH | Na | NH4+ | NO3− | | K | AlkP | AcdP | FDA | MBP |
| Root yield | | −0.54 | −0.52 | 0.08NS | 0.36 | 0.27NS | 0.00NS | −0.12NS | −0.03NS | −0.05NS | −0.20NS | 0.05NS | Biomass | | | 0.07NS | 0.01NS | −0.17NS | −0.13NS | −0.09NS | 0.06NS | 0.11NS | 0.03NS | −0.01NS | 0.01NS | pH | | | | −0.18NS | −0.33 | −0.34 | −0.21NS | 0.22NS | −0.12NS | 0.02NS | 0.00NS | −0.31 | Na | | | | | 0.06NS | 0.48 | −0.03NS | −0.04NS | 0.61 | 0.56 | 0.08NS | 0.29 | NH4+ | | | | | | 0.69 | 0.51 | 0.02NS | 0.14NS | 0.00NS | 0.03NS | 0.4 | NO3− | | | | | | | 0.46 | 0.02NS | 0.42 | 0.25NS | 0.1NS | 0.38 | P | | | | | | | | 0.27NS | 0.16NS | −0.01NS | 0.61 | 0.17NS | K | | | | | | | | | −0.03NS | −0.26NS | 0.24NS | −0.01NS | AlkP | | | | | | | | | | 0.81 | 0.17NS | 0.37 | AcdP | | | | | | | | | | | 0.12NS | 0.27NS | FDA | | | | | | | | | | | | 0.20NS | MBP | | | | | | | | | | | | |
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Significance of correlations indicated by , , and is equivalent to < 0.05, < 0.01, and < 0.001, respectively. NS, nonsignificant. |