Research Article
Compost and Biochar to Promote Soil Biological Activities under Sweet Potatoes Cultivation in a Subtropical Semiarid Region
Table 4
Soil pH and sodium concentration during the growing season of sweet potatoes at preplanting and 39, 48, and 92 days after planting.
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Values are means ± standard errors (n = 3). Values within a column and variable followed by the same lowercase letter or within a row followed by the same uppercase letter are not significantly different ( > 0.05). Values followed by asterisk () are significantly different than preplanting values ( < 0.05). Control: no amendment; NPK: synthetic fertilizer; RC: regular compost; AC: accelerated compost; biochar: biochar produced from walnut shell feedstock. |