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El ensayo se llevó a cabo en la finca El Cortijo (La Vega, Cundinamarca, Colombia [04°55'N y 74°18'W], 2350 m altitud, 17°C temperatura media, 1423 mm precipitación anual, 85% humedad relativa, 1377 horas brillo solar/año). Se utilizaron árboles de feijoa o goiabeira serrana de seis años, Clon 41 ('Quimba'), evaluando fertilizantes foliares KNO3 (Nitrato de Potasio 13-0-46® 1%, 1,5% y 2%) y KH2PO4 (fosfato de potasio; Cosmofoliar 0-32-43®; 0,5%, 0,75% y 1,0%) y la fitohormona ethephon (Ethrel® 48 SL; 100, 150 y 200 mg L-1). Se determinaron el número de botones florales inducidos, flores formadas, además, el porcentaje de flores formadas y nivel de eficacia de los productos inductores. El KH2PO4 al 0,5% obtuvo resultados favorables en cada una de las variables evaluadas, comparado con el 0,75% y 1% del mismo producto y, sin embargo hubo un alto número de flores inducidas y formadas, no se presentaron diferencias significativas con el testigo. Ethephon a 150 mg L-1 en la inducción de botones florales y a 100 mg L-1 en la de formación de flores mostró resultados favorables, pero tampoco pudo superar el testigo por falta de significancia. La respuesta generada por KNO3 mostró una baja inducción de botones florales, y una eficacia negativa en la proporción de flores formadas; asimismo fitotoxicidad, cuando se emplearon concentraciones al 2% de este producto. The experiment was carried out in El Cortijo farm (La Vega, Cundinamarca, Colombia [ 04° 55' N and 74° 18' W ], 2350 m above sea level, 17° C average temperature, 1423 mm of annual precipitation, 85% of relative humidity, and 1.377 of sunshine hours/year). In the study, evaluation of foliar fertilizers KNO3 (potassium nitrate 13-0-46® 1%, 1.5%, and 2%), KH2PO4 (potassium phosphate; Cosmofoliar 0-32-43®; 0.5%, 0.75%, and 1.0%), and ethephon phytohormone (Ethrel® 48 SL; 100, 150, and 200 mg L-1) was done on six year old pineapple guava trees of Clone 41 ('Quimba'). The number of induced floral buds and formed flowers were evaluated, as well as the percentage of formed flowers, and the efficacy levels of inducting products. Application of KH2PO4 at 0.5% produced favorable results in each of the proposed variables; compared to 0,75% and 1% of the same product and, however there were a high number of induced and formed flowers, no significant differences with the control were found. With ethephon at 150 mg L-1 in floral induction and at 100 mg L-1 in flower formation good responses was obtained, but no differences with the control. The plant response to KNO3 was a low induction of floral buds and a negative efficacy in the proportion of flowers formed, and also phytotoxicity when KNO3 concentration was 2%

revista brasileira de fruticultura

Efecto del nitrato de potasio, fosfato de potasio y ethephon en la inducción floral de la feijoa o goiabeira serrana (Acca sellowiana [O. Berg] Burret)