CONCENTRAÃÃO DE NUTRIENTES, PRODUTIVIDADE E QUALIDADE DE FRUTOS EM TOMATEIRO CULTIVADO EM SUBSTRATOS E COM APLICAÃÃO DE ÃCIDOS HÃMICOS / Content of nutrients, yield and fruit quality of tomato grown on substrates and with application of humic acids

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

The leaf content, yield and quality of tomato fruit grown on substrates and with application of humic acids were evaluated. The experiment was carried from August 2007 to January 2008, under unheated greenhouse conditions in the Departamento de Agricultura da Universidade Federal de Lavras. The 35-day old seedlings of hybrid Venus tomato were placed into 7.0 L bags, spaced 1.0 m x 0.80 m x 0.40 m. The experimental design was of randomized blocks in a factorial 4x4, and 4 doses of humic acids (AH) and 4 organic substrates were tested, with 4 replications. Four doses of AH were evaluated (0, 20, 40 and 80 L ha-1) and 4 substrates: S1 - coconut fiber (CF), S2 - CF + carbonized bark of coffee (CC) â 1/3, S3 - CF + CC â 2/3 and S4 - CC. The humic acids applications were made 4 times in a 8 day interim, the first application eight days after the transplantation. There was no significant effect of treatments on the contents of N and K in leaves, in the production of fruit (small, medium, non-commercial) or in moisture, soluble solids (SS), tritable acidity (AT) or SS/AT. Increasing doses of AH decreased the content of Ca, S, B, Cu (at S1) and Mn in the leaves, however, they linearly increased the content of Zn and relations of K/Ca and K/Mg. At dosages of 36 to 49 L ha-1 AH, there was the peak contents of Fe, Cu (in S2, S3 and S4), Fe/Zn and Fe/Mn relations in the leaves and SS/AT relation in fruits. There was significant substrates effect on P, Mg, Ca, Cu and Mn contents in the leaves and on fruit production (total and commercial), index of commercial precocity, production of large fruit, fresh fruit weight and dry weight of fruit. The production of fruits under S1 was higher than that of any other substrates, with an average of 162.08 t ha-1, showing an increase in yield of 24.41%, 29.33% and 36.04% as compared to S2, S3 and S4, respectively. The production of large fruits in S1, of 83.20 t ha-1 was 3.6 times higher than in S4. The humic acids, despite having influenced the leaf content of nutrients, showed no significant effect on the increase of yield and quality of fruits under the conditions of this experiment.

ASSUNTO(S)

tomateiro,substratos orgÃnicos,Ãcidos hÃmicos. fitotecnia substrates,application,humic acids

ACESSO AO ARTIGO

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