Abstract:

The study aims to explore the effect of nitrogen-potassium, nitrogen-phosphorus-potassium, organic-inorganic fertilization on Weigela florida ‘Gold rush’ physiological characteristics, and to provide a basis for rational fertilization in growing seedlings and tree maintenance. The test was under field condition, treatments were set including control (T₁), conventional fertilization (T₂), nitrogen-phosphorus-potassium treatment (T₃), organic-inorganic fertilizer treatment (T₄), repeated 3 times. The results showed that: from June to September, the soluble sugar content of T₄was higher than that of T₃ by 28.54%, 32.31%, 24.92%, 23.85%, while the soluble sugar content of T₃ was significantly higher than that of the control; the proline content of T₄ was higher than that of T₃ by 9.21%, 11.99%, 13.84%, and was significantly higher than that of T₂, the proline content of T₃ was significantly higher than that of control; the CAT activity of T₄ was higher than that of T₂ by 41.58%, 51.75%, 55.69%, 63.68%, there was no significant difference between T₂ and T₃; the SOD activity of T₄ was higher than that of T₃ by 8.97%, 28.49%, 30.19%, 44.85%, there was no significant difference between T₂ and T₃, and the SOD activity of T₂ was significantly higher than that of the control; the chlorophyll content of T₄ was higher than that of T₃ by 13.00%, 15.14%, 22.33%, MDA content decreased by 36.71%, 43.17%, 48.76%. According to the comprehensive analysis, T₄ has the most significant effect on improving physiological characteristics of Weigela florida ‘Gold rush’.

Key words: Weigela florida ‘Gold rush’, fertilizer application, physiological characteristics, SOD, CAT, chlorophyll