Uso de biofertilizante na produção de mudas de repolho

Abstract

A utilização de produtos biofertilizantes, como fermentados bacterianos, contendo aminoácidos, é pouco estudada na produção de mudas de hortaliças, especialmente no sistema orgânico. Neste trabalho, o objetivo foi avaliar o efeito da aplicação foliar de um fermentado bacteriano do melaço da cana, contendo 30% do aminoácido ácido Lglutâmico, no desenvolvimento de mudas de repolho. Os tratamentos, constituídos por quatro repetições, eram compostos por concentrações do fermentado (0; 0,1; 0,2; 0,4 e 0,8 mL L -1 ) aplicadas nas folhas, em intervalos de sete ou de 14 dias. Aos 35 dias após a semeadura, foram determinados o índice relativo de clorofila, a área foliar e o volume do sistema radicular. O fermentado bacteriano promoveu incrementos do índice relativo de clorofila, da área foliar e do volume radicular, quando aplicado com intervalos de 14 dias, e incremento do volume radicular, quando aplicado com intervalos de sete dias. Ocorreu redução da área foliar, quando aplicado em concentrações superiores a 0,2 ml L -1 , com intervalos de sete dias. O biofertilizante incrementa o desenvolvimento de mudas de repolho. Palavras-chave:Brassica oleracea var. capitata L., aminoácido, produção orgânica, ácido L-glutâmico, clorofila. Cinthia Biofertilizers in cabbage seedling productionThe use of biofertilizers such as bacterial fermentation broth containing amino acids is poorly studied in the production of organic seedlings. The aim of this study was to test the effect of foliar spraying of the sugarcane fermented broth containing 30% of L-glutamic acid, on the growth of cabbage seedlings, without using synthetic fertilizers. The treatments consisted of foliar spraying with solutions containing different concentrations of fermented broth (0, 0.1, 0.2, 0.4 and 0.8 mL L -1 ), in four repetitions, in intervals of seven or fourteen days. At 35 days after sowing, the following variables were determined: chlorophyll relative index, leaf area and root volume. The fermented broth increased the chlorophyll relative index, leaf area and root volume when applied in intervals of fourteen days, and increased the root volume when applied in intervals of seven days. There was a reduction in leaf area when applied in concentrations higher than 0.2 ml L -1 in intervals of seven days. The biofertilizer enhanced the development of cabbage seedlings.

Cambios en el crecimiento y concentración de aminoácidos en las plántulas de col china usando caldo bacteriano fermentado

“…Application of 0.2 mL.L -1 AG30 increased leaf area by 47% compared to the control (Figure 4). Röder et al (2015) found similar results using bacterial fermented containing L-glutamic acid in cabbage seedlings. However, at a higher concentration (0.8 mL.L -1 ), leaf area increased by 22% compared to the control with no application.…”

“…However, a significant gain was observed in the relative chlorophyll index compared to the control in seedlings of Brassica oleracea var. capitata submitted to the application of bacterial fermented containing L-glutamic acid (Röder et al, 2015).…”

“…The application was made 15 days after sowing, when the first true leaves appeared. A pressurized spray with CO 2 and constant pressure of 45 pounds pol -1 was used with a spray volume of 100 mL per treatment (Röder et al, 2015).…”

“…Studies focusing on the use of promoting effect products derived from fermentative processes on plant growth are rare; however, recent studies have shown that bacterial fermentation of cane molasses containing the amino acid L-glutamic acid promoted increases in the biomass of the aerial part and the growth of the roots of the seedlings, characterizing it as a biofertilizer (Bettoni et al, 2014;Röder et al, 2015).…”

Bioactivity of Cyanobacterial Biomass Related to Amino Acids Induces Growth and Metabolic Changes on Seedlings and Yield Gains of Organic Red Beet

“…However, the leaves expansion could be a consequence of the stimulus to chlorophyll synthesis, photosynthesis, and increase on sugar content, with all of these pathways related to the AA metabolism on plants [40]. The increase on Chl by AA application was previously reported regarding to the biosynthesis of aminolevulinic acid from the intact carbon skeleton of exogenously applied L-glutamic acid [41], and the joint increases of Chl, AA and plant growth by AA application, were also found by use of fermentation based biofertilizer containing 29% (w/v) of free AA applied on cabbage seedlings [42]. Figure 3(a), Figure 3(b) and Figure 3(d), express the Apb remarkable eliciting effect on Chl, AA and protein biosynthesis, that are connected to the plant growth promotion (Figure 2).…”