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Leaf macronutrient contents in chrysanthemum grown in substrate containing urban solid waste compost and carbonized rice rusk.

This study was carried out to investigate the influence of adding urban solid waste compost (CLU) combined with carbonized rice husk (CAC) on the growth and content of leaf macronutrients (N, P, K, Ca and Mg) in two chrysanthemum (Dendranthema grandiflora Tzvelev) varieties Amarelo São Paulo and Puritan. The treatments were constituted of a soil-sand-conditioner mixture (2:1:4 volumetric proportion) with the mixture conditioner being CAC + CLU, where T1 = 100% CAC; T2 = 67% CAC + 33% CLU; T3 = 33% CAC + 67% CLU and T4 = 100% CLU. The plants were grown in pots and harvested in parcels as each treatment presented 70% opened inflorescence. The leaf concentrations of the studied macronutrients were determined. Variations in CLU and CAC concentrations affected the leaf concentrations of N, P and Ca, with the maximum leaf N and P contents being reached at 33% CLU, as conditioner, and the maximum Ca and Mg contents at 66% and 100% CLU, respectively. The absorption of nutrients by the plants was influenced by a high pH (>7.4) and electric conductivity (>12.97dS/m) presented by the substrates containing CLU. K concentration was not affected by CLU and CAC concentrations, remaining constant in all the treatments. No toxicity symptoms were observed in the plants.

ISSN: 2447-536X

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