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O experimento foi conduzido no telado do pomar da Universidade Federal de Lavras (UFLA), durante o período de novembro de 2003 a fevereiro de 2004. Realizado com o objetivo de avaliar o efeito de seis diferentes substratos (convencional, Plantmax®, composto I, composto II, vermiculita e húmus), interagindo com três doses do corretivo à base de Lithothamnium, 0 %, 5% e 10% (v/v), sobre o crescimento do citrumeleiro 'Swingle', até o momento da repicagem. Foram utilizados tubetes plásticos cônicos com volume de 75 mL, acondicionados em bandejas com capacidade para 198 tubetes. O delineamento experimental utilizado foi blocos casualizados, em esquema fatorial de 6 x 3, sendo os fatores compostos pelos seis diferentes substratos e três diferentes doses do corretivo à base de Lithothamnium, compondo assim, dezoito tratamentos com quatro repetições, sendo cada parcela composta por vinte e duas plântulas. Decorridos cem dias após a semeadura, as plântulas foram retiradas dos tubetes, seccionadas na base do coleto,e registrados os comprimentos da parte aérea e da raiz. Em seguida a biomassa seca da raiz e da parte aérea foram avaliadas. Verificou-se que o húmus e o composto I, isoladamente apresentaram os melhores resultados de crescimento. O corretivo à base de Lithothamnium mostrou ser uma alternativa de incremento nutricional para o crescimento de mudas de citrumeleiro 'Swingle', em condições de pH baixas, e com pouca disponibilidade de Ca e Mg. This experiment was established aiming at evaluating the effect of six different substrates (conventional, Plantmax®, compost I, compost II, vermiculite, and muck), interacting with three different Lithothamnium doses, 0%, 5% and 10% (v/v), over the growth of citrumelo "Swingle" plantlets, until the moment of chiming. The experiment was conducted within the orchard of the Federal University of Lavras, in the state of Minas Gerais, Brazil, during the period of November 2003 until February 2004. The experimental design used was random blocks, in a factorial squeme of 6x3, with the factors constituted by six different substrates and three different Lithothamnium doses, composing thus, eighteen treatments with four repetitions. Each parcel was composed by twenty two plants. One hundred days after the planting, all the plantlets were taken off the plastic tubes, washed under tap water, and were sectioned in the base of the stem. Thus, the data of the length of each of the parts were recorded. Afterwards, the parts of the plantlets, were placed inside paper bags and transferred to forced air drying hoods, at a temperature of 75º C, during a period of 72 h. The dry weight of the canopy and root system were registered. It was observed that muck and compost I, separately, presented the best results in terms of growth and amount of dry matter. Lithothamnium evidenced as an alternative to increase nutrient availability to the citrumelo growth plantlets, but only when the pH conditions and the availability of Ca and Mg were low

ciência e agrotecnologia

Crescimento e percentual de emergência de plântulas de citrumeleiro 'Swingle' em função dos substratos e das doses de corretivo à base de Lithothamnium, após cem dias da semeadura