Effects of continuous biochar application on soil chemical properties and tomato yield and quality in an arched shed.

Interaction effect analysis revealed that biochar and interannual variation had highly significant interactions (P< 0.01) only for soil pH, EC, and available potassium, with no significant interaction effects on SOC, hydrolyzable nitrogen, or available phosphorus. 3.2.

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The differences in soil available potassium content among treatments showed a decreasing trend annually, becoming non-significant by the third year.

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