Resumo

CALDERIN GARCIA, Andrés et al. Effects of a humic liquid extract obtained from vermicompost on growing and yield corn. Rev Cie Téc Agr [online]. 2016, vol.25, n.1, pp.38-43. ISSN 2071-0054.

Vermicompost (VC) and its extracts (liquid humus) are materials that stimulate the growth and development of the plants, increasing their yield in small and large-scale farming conditions. This paper evaluates the biological effects of a liquid humic extract, previously characterized on the parameters of growth, development and production in the cultivation of maize (Zea mays L.). To the residual solid remaining after the obtaining liquid humus (Liplant®) from VC cattle manure, was applied a new extraction of humic substances (HS) in basic medium. The new liquid extract (ELH) was applied toleaves of corn plants in field conditions at dilutions of 1:10, 1:20 and 1:30 (v:v). To study the effects of ELH it was evaluated growth, development and production parameters. Chemical and physical characteristics of ELH were similar to aqueous humified compounds. The foliar application of ELH to corn plants, exerted positive effects on length and stem diameter, length of cobs without leaves, cobs fresh weight with and without leaves and on the yield of the number of cobs. From these results, it is possible to propose studies to incorporate this new liquid humus in the initial formulation of liquid humus (Liplant® product) or in its technology of application.

Palavras-chave : liquid humus; organic management; humic acids; bioactivity.

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