Abstract
A greenhouse experiment was conducted to establish the optimal fertilization management for Leucadendron ’Safari Sunset‘ (Leucadendron salignum × L. laureolum). Addition of NPK and micronutrient fertilizer or raising phosphorus concentration by itself increased total fresh weight and improved plant growth. Elevating the total nutrients or P concentration increased N and P concentrations. Clusters of proteoid roots were present along the root system of plants irrigated with tap-water, whereas few proteoid roots developed on plants irrigated with complete nutrient solution when only P was omitted, and none developed in any of the other treatments with P present.
The pH in leachate of plants irrigated with tap water or with high nutrient levels (100, 20 and 100 mg L-1 of N, P and K, respectively) was consistently lower compared with leachate without plants. Increasing concentration resulted in a significant change in the ΔpH values (pH in leachate with plant – pH in leachate without plant) from negative to positive. This phenomenon is probably related to rhizosphere effects due to plant and microbial activity.
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Silber, A., Ganmore-Neumann, R. & Ben-Jaacov, J. Effects of nutrient addition on growth and rhizosphere pH of Leucadendron ‘Safari Sunset’. Plant and Soil 199, 205–211 (1998). https://doi.org/10.1023/A:1004365110616
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DOI: https://doi.org/10.1023/A:1004365110616