Effect of potassium fulvate on continuous tobacco cropping soils and crop growth.

Potassium fulvic acid improves nutrients in mono-cropped soil and promotes tobacco plant growth Tobacco continuous cropping experiment showed that with the increase of continuous cropping years, the soil organic matter content was basically unchanged, the pH decreased, the quick-acting nitrogen, phosphorus and potassium content generally showed a decreasing trend, and the content of most trace elements showed a decreasing trend.

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The plant height of T2 and T3 treatments showed an increasing trend compared to conventional fertiliser application, the maximum leaf length of T2 and T3 treatments was the best compared to conventional fertiliser application, the maximum leaf width of T2 treatment was the best compared to conventional fertiliser application at 60d, the stem girth of T2 treatment showed an increasing trend compared to conventional fertiliser application, and the effective number of leaves of T2 and T3 treatments was continuously increasing compared to conventional fertiliser application ( Table 4 ).

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