EFICIÊNCIA DO USO DA ÁGUA E COEFICIENTE DE CULTIVO PARA LISIANTHUS DE CORTE CULTIVADO EM AMBIENTE PROTEGIDO

English. Lisianthus is considered one of the most economically important species in the national and international market. However, to achieve the quality demanded by the market, efficient water management during the production period is necessary. One of the alternatives capable of optimizing water use efficiency is the addition of hydrogel to the substrate, associated with irrigation. In this sense, the objective of this work was to determine the cultural coefficients of cutting lisianthus and to evaluate the efficiency of water use under the combined effect of different irrigation management and hydrogel doses in a protected environment in two growing seasons. The design adopted was completely randomized, with a 5x4 factorial distribution, with five irrigation depths, namely: 40, 60, 80, 100 and 120% of the pot's holding capacity, and four doses of hydrogel (0, 3, 6 and 9 grams per pot). Four replicates were used for each treatment, totaling 80 pots. In conclusion, fresh weight, water consumption and water use efficiency were significantly affected by the interaction between irrigation depths and hydrogel doses in the two growing seasons. However, irrigation depths around 80% to 100% of the CRV are more suitable for providing satisfactory results with less water volume, generating savings.  

Portuguese. EFICIÊNCIA DO USO DA ÁGUA E COEFICIENTE DE CULTIVO PARA LISIANTHUS DE CORTE CULTIVADO EM AMBIENTE PROTEGIDO     JÉSSICA DARIANE PIROLI1; MARCIA XAVIER PEITER2; ADROALDO DIAS ROBAINA3; MARCELO ANTONIO RODRIGUES4; ANDERSON CRESTANI PEREIRA5 E LAURA DIAS FERREIRA6   1 Eng. Agrônoma, Doutora em Engenharia Agrícola, UFSM, Avenida Roraima, nº 1000, bairro Camobi, CEP: 97105-900, Santa Maria, RS, Brasil. Email: jehpiroli@hotmail.com 2 Eng. Agrônoma, Doutora, Professora Associada do Departamento de Engenharia Rural, UFSM, Avenida Roraima, nº 1000, bairro Camobi, CEP: 97105-900, Santa Maria, RS, Brasil. Email: mpeiter@gmail.com 3 Eng. Agrônomo, Doutor, Professor Titular do Departamento de Engenharia Rural, UFSM, Avenida Roraima, nº 1000, bairro Camobi, 97195-000, Santa Maria, RS, Brasil, CEP. Email: diasrobaina@gmail.com 4 Eng. Agrônomo, Doutor, Professor do Colégio Politécnico da Universidade Federal de Santa Maria, UFSM, Avenida Roraima, nº 1000, bairro Camobi, CEP: 97105-900, Santa Maria. Email: marceloarodrigues2002@yahoo.com.br 5 Eng. Agrônomo, Mestre, Doutorando no Programa de Pós-Graduação em Agronomia, UFSM, Avenida Roraima, nº 1000, bairro Camobi, CEP: 97105-900, Santa Maria, RS, Brasil. Email: acrestanipereira@gmail.com 6 Eng. Agrônoma, Mestra, Doutoranda no Programa de Pós-Graduação em Engenharia Agrícola, UFSM, Avenida Roraima, nº 1000, bairro Camobi, CEP: 97105-900, Santa Maria, RS, Brasil. Email: lauradiasferreira14@gmail.com     1 RESUMO   O lisianthus é considerado uma das espécies de maior relevância econômica no mercado nacional e internacional. Contudo, para alcançar a qualidade que o mercado exige, é necessário um manejo hídrico eficiente durante o período de produção. Uma das alternativas capaz de otimizar a eficiência no uso da água é a adição de hidrogel ao substrato, associada à irrigação. Nesse sentido, o objetivo desse trabalho foi determinar peso fresco, consumo hídrico, eficiência do uso da água e os coeficientes de cultura do lisianthus de corte, sob o efeito combinado entre diferentes manejos de irrigação e doses de hidrogel, em ambiente protegido, em duas épocas de cultivo. O delineamento adotado foi o inteiramente casualizado, com esquema fatorial 5x4, sendo cinco lâminas de irrigação: 40, 60, 80, 100 e 120% da capacidade de retenção do vaso, e quatro doses de hidrogel (0, 3, 6 e 9 gramas por vaso). Foram utilizadas quatro repetições para cada tratamento, totalizando 80 vasos. Em conclusão, o peso fresco, consumo hídrico e a eficiência do uso da água, foram significativamente afetadas pela interação entre lâminas de irrigação e doses de hidrogel nas duas épocas de cultivo.   Palavras-chave: Eustoma grandiflorum, consumo hídrico, evapotranspiração, otimização de uso da água.     PIROLI, J. D.; PEITER, M. X.; ROBAINA, A. D.; RODRIGUES, M. A.; PEREIRA, A. C.; FERREIRA, L. D. EFFICIENCY OF WATER USE AND CROP COEFFICIENT FOR LISIANTHUS AS CUT FLOWER CULTIVATED IN GREENHOUSE       2 ABSTRACT   Lisianthus is considered one of the most economically important species in the national and international market. However, to achieve the quality demanded by the market, efficient water management during the production period is necessary. An alternative capable of optimizing the water use efficiency is the addition of hydrogel to the substrate, associated with irrigation. In this sense, the objective of this work was to determine fresh weight, water consumption, water use efficiency and crop coefficients of cut lisianthus under the combined effect of different irrigation management and hydrogel doses in a protected environment in two growing seasons. The design adopted was completely randomized, with a 5x4 factorial distribution, with five irrigation depths, namely: 40, 60, 80, 100, and 120% of the pot's holding capacity, and four doses of hydrogel (0, 3, 6, and 9 grams per pot). Four replicates were used for each treatment, totaling 80 pots. In conclusion, fresh weight, water consumption and water use efficiency were significantly affected by the interaction between irrigation depths and hydrogel doses in the two growing seasons.   Keywords: Eustoma grandiflorum, water consumption, evapotranspiration, optimization of water.