Effect of Liquid organic fertilizer, Nano-zinc and Triacontanol on Vegetative Growth and leaf Mineral Composition of lemon Trees

• Hussein K. E. AL-Shujairy1 and Mustafa E.A. Al-Hadethi2

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This experiment was conducted in one of private orchards located in Alexandria district, affiliated with Babylon (45 km south of Baghdad), for 2024 growing season on lemon trees to study effect of adding liquid organic fertilizer (proteon) and spraying with Triacontanol and Nano-zinc on vegetative growth and leaves mineral content of local lemon trees. Treatments were designed with a factorial experiment within RCBD design, that included adding liquid organic fertilizer with three levels 0 (O₀), 50 (O₁) 100 (O₂) ml.L^-1 as 5 liters per tree, Nano-zinc spray with three levels 0(Z₀), 50(Z₁) and 100 (Z₂) mg.L^-1 and Triacontanol spray with three levels 0 (T₀), 10 (T₁) and 20 (T₂) mg.L^-1 . Number of trees was 81. Results showed that addition of liquid organic fertilizers at a 100 ml.L^-1 (O₂) led to a significant increase in stem diameter of 4.063 cm, shoot length of  6.615cm, leaf area 41.78 cm² , leaves nitrogen content of 1.718%, phosphorus of 0.407 %, potassium 1.740 %. Results showed also superiority of spraying Nano-zinc at a 100 mg.L^-1 (Z₂) in stem diameter of  3.922 cm, leaf area 36.74 cm², leaves nitrogen content of 1.615 %, phosphorus of 0.402 %, potassium of 1.697 % . Results also showed superiority of Triacontanol spraying especially at a concentration of 20 mg.L^-1 (T₂) in shoot length of  5.559 cm, leaf area 37.64cm², leaves nitrogen content of 1.611 %, phosphorus of  0.409 %, potassium of 1.742 %. Effect of twice and triple interactions between study factors were significant in all studied traits.

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