BIOFERTILIZERS AND BIOCONTROLLERS AS AN ALTERNATIVE TO THE USE OF CHEMICAL FERTILIZERS AND FUNGICIDES IN THE PROPAGATION OF YERBA MATE BY MINI-CUTTINGS

GORTARI, FERMIN; NOWOSAD, MAXIMO IVAN PETRUK; LACZESKI, MARGARITA ESTHER; ONETTO, ANDREA; CORTESE, ILIANA JULIETA; CASTRILLO, MARIA LORENA; BICH, GUSTAVO ANGEL; ALVARENGA, ADRIANA ELIZABETH; LOPEZ, ANA CLARA; VILLALBA, LAURA; ZAPATA, PEDRO DARIO; ROCHA, PATRICIA; NIELLA, FERNANDO

REVISTA ÝRVORE

UNIV FEDERAL VICOSA

Año: 2020 vol. 43 p. 1 - 12

0100-6762

The production of yerba mate seedlings through seeds has several limitations, which canbe overcome by ex vitro vegetative propagation techniques such as the mini-cuttings, in which it is usuallynecessary to use synthetic chemical fertilizers and fungicides. However, there is a tendency towards sustainableagriculture, using biofertilizers (growth-promoting bacteria) and biocontrollers (Trichoderma sp.). Therefore,the objectives of this work were to evaluate the eff ect of biofertilizers on the production of mini-cuttings fromyerba mate mini-stumps; as well as the eff ect, of biocontrollers on survival and rooting capacity of minicuttings. Strains of Bacillus sp. and Trichoderma asperelloides of yerba mate were used under two radiationconditions. There was a positive relationship between the availability of radiation and the production of minicuttings and the rooting capacity. All the mini-stumps sprouted regardless of treatments. The largest productionof viable mini-cuttings occurred in a situation of high radiation and fertilization; while the treatments withgrowth-promoting bacteria and high radiation had intermediate values. The mini-cuttings inoculated withTrichoderma asperelloides had higher rooting percentage, greater number and length of roots than the minicuttings treated with fungicide. Therefore, we demonstrated that the use of chemical products can be replacedby biological ones and achieves acceptable yields.