Resumo

PRECIADO RANGEL, Pablo et al. Effect of Ammonium and Phosphate on the Growth of Jalapeño Pepper Seedlings. Terra Latinoam [online]. 2008, vol.26, n.1, pp.37-42. ISSN 2395-8030.

An experiment was carried out to evaluate the effect of NH₄⁺ and H₂PO₄^- concentrations in nutrient solution on the growth and nutrient uptake of jalapeño seedlings (Capsicum annuum L.) cv. Jalapeño M. The experiment was established with a completely randomized design where the treatments were arranged in a 3² factorial distribution to evaluate three doses of NH₄⁺ and H₂PO₄^- as well as the regional recommendation as a control treatment. The measured variables were shoot dry weight (PSV), root dry weight (PSR), number of leaves (NH), leaf area (AF), chlorophyll readings, shoot height (AP), stem diameter (DT) and N, P, K, Ca and Mg uptake. Concentrations of 1.5 mmol L^–1 of NH₄ produced the highest values of PSR, AF, CCL, AP, DT and N, Ca and Mg uptake. Concentrations of 1 mmol L ¹ of H₂PO₄^- affected PSV and N, K and Ca uptake. Interaction was found between NH₄⁺ and H₂PO₄^- for PSV, SPAD readings and P. Mean values of DT and NH for the factorial treatments were higher than those of the control.

Palavras-chave : Capsicum annuum; nitrogen; phosphorus.