02454naa a2200325 a 450000100080000000500110000800800410001910000260006024502010008626000090028752014460029665000210174265000120176365000210177565000220179665000250181865000210184365300190186465300230188370000180190670000200192470000190194470000160196370000220197970000190200170000190202070000200203970000190205977300500207821343032023-01-31       2022    bl uuuu     u00u1 u    #d1 aFERREIRA, C. C. de S.  aDevelopment of the prickly pear cactus Opuntia stricta (Haw.) Haw. (Cactaceae) in vitro in response to the replacement of potassium nitrate for a commercial kno3 fertilizer.h[electronic resource]  c2022  aIn micropropagation, potassium nitrate (KNO3), an ACS reagent grade chemical, used in the preparation of growing mediums is expensive and its procurement depends on bureaucratic procedures, as it is controlled by the Brazilian Army. This research to assessed the effect of replacing the ACS KNO3 for a commercially available fertilizer (KNO3- based) on the micropropagation of the prickly pear cactus (Opuntia stricta (Haw.) Haw. cv. Elephant Ear. Treatments used six different fertilizer concentrations (0, 0.5, 1, 1.5, 2 and 2.5 g L-1) and a control consisting of 1.9 g L-1 KNO3 , as shown in the MS salts. The survival, size and number of sprouts and the value of fresh biomass were evaluated. After seedling acclimation, we assessed the survival, number of sprouts, length, and number of roots, racket formation, average fresh biomass mass, macronutrient absorption and morphological changes of the seedlings. Explants inoculated with fertilizers at concentrations of 0.0; 2.0 and 2.5 g L-1 did not grow. The response of explants at concentrations of 0.5 and 1.5 g L-1 of the fertilizer were the same as those developed in a KNO3 medium, and at a concentration of 1.0 g L-1, in all variables, the means were higher than those of the control medium. Therefore, it showed the feasibility of using fertilizers in the in vitro cultivation of the prickly pear cactus, which may remove bureaucratic barriers and reduce product costs by 99.12%.  aMicropropagation  aOpuntia  aCultura In Vitro  aMicropropagação  aOpuntia Ficus Indica  aPalma Forrageira  aMacronutriente  aRedução de custo1 aPAZ, C. D. da1 aSOUZA, J. C. de1 aPEIXORO, A. R.1 aRIOS, L. S.1 aNASCIMENTO, A. R.1 aRIBEIRO, J. M.1 aMELO, N. F. de1 aTEIXEIRA, S. L.1 aARAÚJO, J. F.  tCiência Ruralgv. 52, n. 1, e20200122, 2022.