Recuperação de mudas de cafeeiro em tubetes arvés de podas.

Abstract

O objetivo do presente trabalho, foi de comparar a viabilidade do reaproveitamento de mudas de cafeeiro produzidas em tubetes, remanescentes em viveiros, através de podas. O experimento foi conduzido no viveiro de mudas do Setor de Cafeicultura da UFLA de agosto de 2003 à dezembro de 2004. Utilizou-se mudas da cultivar Rubi, apresentando 7 a 9 pares de folhas, caracterizando mudas passadas. O delineamento experimental utilizado foi em blocos casualizados em esquema fatorial [(2 x3) + 2], com dois diâmetros (mudas de diâmetro inferior e superior à 4mm), 3 épocas de corte (abril, julho e setembro) e dois tratamentos adicionais que constaram de novas semeaduras em abril e julho. Foram portanto, 8 tratamentos com 4 repetições, sendo a parcela de 13 plantas sendo as 5 centrais úteis. Utilizou-se o substrato comercial Plantmax (35%) em mistura com casca de arroz carbonizada (65%). Avaliou-se: nº de brotações, altura de broto/planta, diâmetro de broto/planta, nº de nós, área foliar, massa seca da parte aérea, massa seca do sistema radicular e as relações entre as duas. Concluiu-se que: mudas remanescentes em viveiros (passadas) produzidas em tubetes, podem ser reaproveitadas através de podas, com melhor desenvolvimento em relação às mudas tradicionais de meio-ano, com superioridade daquelas de maior diâmetro e época de poda em abril.

Coffee seedlings must be lost when left in nursery after planting time, although research works have showed that they may be used when they are grown in polyethylene bags. The objective of this work was to compare polyethylene bags and tubets as recipients for coffee seedlings to remain in nursery for late planting after pruning. The experiment was established at Coffee Sector of UFLA (Lavras Federal University) from August 2003 to December 2004. Coffee “Rubi” cultivar was used when seedlings were at 7 to 9 leaves stage, characterizing old seedlings. The experiment was a randornized block design in a factorial scheme of 2x3+1, being two seedling diameters (below and above 4mm), three pruning time (April, July, and September) including two additional treatments: new seedlings in April and July Each plot was constituted of 13 seedlings and the five central ones were used for evaluations. Plantmax (35%) mixed with carbonized rice husk (65%) was used as substrates to fill bags and tubets. Sprouts number, size and diameter; nods number, leaf area, and above ground and roots dry weights were evaluated during the time course of the experiment. It was concluded that old seedlings remained in nurseries when grown in tubets may be used for late planting when pruned accordingly, and show better development than traditional half-year seedlings, standing out those with small diameters pruned in April.