Irrigation frequency using hydro-absorbent polymer in seedling production of yellow passion fruit/Frequencia de irrigacao utilizando polimero hidroabsorvente na producao de mudas de maracujazeiro-amarelo

• Published in: Revista Brasileira de fruticultura Vol. 35; no. 2; p. 518
• Main Authors: de Carvalho, Raoni Pereira, Cruz, Maria Do Ceu Monteiro, Ma
• Format: Journal Article
• Language: Spanish
• Published: Sociedade Brasileira de Fruticultura 01.06.2013
• Subjects: Brasil
• ISSN: 0100-2945

The seedlings production of quality fruit species is carried in a protected environment, and frequent irrigation is needed due to air temperature variations and to keep the substrate moist. Thus, this study was carried out to evaluate different irrigation frequencies and the incorporation of hydro-absorbent polymer in the production of yellow passion fruit seedlings in two substrate types. The seedlings were produced in polyethylene bags of 650 mL in a greenhouse. It was used a factorial scheme 2 x 2 x 3, distributed in a completely randomized design with four replications and five plants per plot, and one per container. The factors studied were two doses of the polymer Hidroplan-EB®/HyB-M: 0 and 3 g [L.sup.-1], two substrates: soil + manure in the ratio 3:1 (v / v) and Bioplant ®, and three intervals of water replacement: daily irrigation, irrigation in alternate days and irrigation every two days. To analyze the comparative effect of polymer incorporation to substrates, the evaluation was performed when the seedlings issued the first vine, which is the ideal stage for field planting. The polymer incorporation in the substrates provided higher seedling size, which was evidenced by the higher dry matter production. Furthermore, these seedlings even with lower irrigation frequency showed similar size to the seedlings that received daily irrigation and leaf area with higher capacity of dry mass production. Thus, irrigation of yellow passion fruit seedlings can be carried with less frequency, with an interval of one day, with the hydro absorbent polymer incorporation in both substrates. The formation of yellow passion fruit seedlings was anticipated in the substrates that had polymer incorporation, achieving adequate size for field planting before those produced without the polymer. Index terms: Passiflora edulis, hydrogel, soil conditioner, water retention. A producao de mudas de especies frutiferas com qualidade e realizada em ambiente protegido que, em funcao das variacoes da temperatura do ar, necessita de irrigacao frequente para manter a umidade no substrato. Desta forma, o trabalho foi realizado com o objetivo de avaliar diferentes frequencias de irrigacao com a incorporacao do polimero hidroabsorvente na producao de mudas de maracujazeiro-amarelo em dois tipos de substrato. As mudas foram produzidas em sacos de polietileno de 650 mL em casa de vegetacao. Foi utilizado o esquema fatorial 2 x 2 x 3, distribuido no delineamento inteiramente casualizado, com quatro repeticoes e cinco plantas por parcela, sendo uma por recipiente. Os fatores estudados foram duas doses do polimero Hidroplan-EB®/HyB-M (0 e 3 g [L.sup.-1]); dois substratos (solo + esterco na proporcao 3:1 (v/v) e Bioplant®); e tres intervalos de reposicao de agua (irrigacao diaria, irrigacao em dias alternados e irrigacao a cada dois dias). Para analisar o efeito comparativo da incorporacao do polimero aos substratos, a avaliacao foi realizada quando as mudas emitiram a primeira gavinha, estagio ideal para o plantio no campo. A incorporacao do polimero aos substratos proporcionou tamanho das mudas, que foi evidenciado a partir da maior producao de massa seca. Alem disso, essas mudas, mesmo com menor frequencia de irrigacao, apresentaram tamanho semelhante as mudas que receberam irrigacao diaria e area foliar com maior capacidade de producao de massa seca. Assim, com a incorporacao do polimero hidroabsorvente, a irrigacao das mudas de maracujazeiro pode ser realizada com menor frequencia, com intervalo de um dia em ambos os substratos. A formacao das mudas de maracujazeiro-amarelo foi antecipada nos substratos que tiveram incorporacao do polimero, alcancando tamanho adequado para o plantio no campo antes daquelas produzidas sem o polimero. Termos para indexacao: Passiflora edulis, hidrogel, condicionador de solo, retencao de agua.