Lithothamnium and Substrates over the growth of Citrumeleiro âSwingleâ. / LITHOTHAMNIUM E SUBSTRATOS NO CRESCIMENTO DE PLÃNTULAS DO CITROMELEIRO SWINGLE .

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

This experiment was establised with the objective of evaluating the effect of six different substrates (conventional, PlamtmaxÂ, compound I, compound II, vermiculite, and muck), interacting with three different Lithothamnium doses, 0%, 5% and 10% (v/v), over the growth of citrumelo âSwingleâ plantlets, until the moment of chiming. The seeds were planted in conical plastic tubes, with a 75 ml volume, placed on 198 cell trays. The trays were placed over a metal net, at a distance of one meter above the soil level. The experiment was conduced 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 seccioned 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 transfered to forced air drying hoods, at a temperature of 75o C, during a period of 72 hs. The dry weight of the canopy and root system were registred, having also been determined the nutrients contents. It was observed that muck and compound I, separatly, presented the best results in terms of growth and amount of dry matter. Lithothamnium evidenced as an alternative to increase nutrient availability to the of citrumelo growth plantlets, but only when the pH conditions and the availability of Ca and Mg are low.

ASSUNTO(S)

crescimento,plÃntula,substrato substrates,lithothamnium,different fitotecnia

ACESSO AO ARTIGO

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