Abstract

GOMEZ-MERINO, Fernando Carlos et al. Macronutrients in petunias grow with different compost rations into the substrate. Rev. Mex. Cienc. Agríc [online]. 2011, vol.2, n.spe3, pp.399-413. ISSN 2007-0934.

In this paper the effect on three substrates consisted of: saline agricultural soil (T1), saline agricultural soil with 30% (v/v) compost (bovine manure and crop residues) (T2) and saline agricultural soil with 80% (v/v) of the same compost (T3) was evaluated; on macronutrient accumulation in petunia (Petunia x hybrida Hort. Vilm.-Andr.) under greenhouse conditions. Nutrient accumulations of N, P, K, Ca and Mg were determined in roots, stems and leaves of petunia using the weights of dry matter and nutrient concentrations obtained per organ, eight months after transplantation. A completely randomized treatments array was used with ten repetitions each. The 80% compost addition significantly increased N concentration in the leaves, stems and roots. Also, the inclusion of compost significantly increased nutrient accumulation of N, P, K, Ca and Mg in the different analyzed tissues and, therefore in the entire plant. The order of nutrient accumulation in the whole plant was different among T1 (K> Ca> N> Mg> P), T2 and T3 (K> N> Ca> Mg> P). These results support the use of organic materials from agricultural activities, for the production of ornamental plants such as petunia, especially when they are processed by composting.

Keywords : Petunia x hybrida; nutrient accumulation; ornamental horticulture; organic matter.

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