Crescimento e qualidade de mudas de Inga laurina em função do substrato e adubação suplementar

Abstract

Resumo -O objetivo deste estudo foi avaliar o efeito de misturas de um substrato comercial e pó de fibra de coco (PFC) no crescimento e na qualidade de mudas de Inga laurina (Sw.) Willd. (Fabaceae). Tubetes de polietileno foram preenchidos com quatro misturas do substrato comercial HS Florestal® (HSF) e PFC nas proporções: T1 = 100% HSF; T2 = 80% HSF + 20% PFC; T3 = 60% HSF + 40% PFC e T4 = 40% HSF + 60% PFC. Os experimentos foram realizados de forma independente, em presença (experimento I) e ausência (experimento II) de adubação suplementar. Foram realizadas avaliações de crescimento e qualidade das mudas ao final dos experimentos, aos 81 dias (experimento I) e 110 dias (experimento II) após a repicagem. Concluiu-se que o uso da adubação suplementar não apresentou diferenças em crescimento e qualidade das mudas de I. laurina até o percentual de 60% de PFC misturado ao substrato comercial. Sem a adição de adubação suplementar, a mistura com 80% HSF + 20% PFC é indicada para a produção de mudas de I. laurina. Além disso, a ausência de adubação suplementar nitrogenada e a adição de PFC ao substrato estimularam a nodulação. Growth and quality of Inga laurina seedlings as a function of the substrate and additional fertilizationAbstract -The aim of this study was to evaluate the effect of mixtures of a commercial substrate and coconut coir dust (CCD) to grow Inga laurina (Sw.) Willd. (Fabaceae) seedlings. Polyethylene tubes were filled with four mixtures of a commercial substrate HS Florestal® (HSF) and CCD in the following proportions: T1 = 100% HSF, T2 = 80% HSF + 20% CCD, T3 = 60% HSF + 40% CCD and T4 = 40% HSF + 60% CCD. The experiments were conducted independently, with supplement fertilization (experiment I) and without (experiment II). Seedlings growth and quality were evaluated at the end of the experiments, 81 days (experiment I) and 110 days (experiment II) after transplanting. It was concluded that supplement fertilization presented no differences in the growth and quality of I. laurina seedlings until up to 60% of PFC mixed with commercial substrate. Without supplement fertilization the mix of 80% HSF + 20% PFC is indicate for production of I. laurina seedlings. Moreover, the lack of supplement nitrogen fertilization and addition of PFC to the commercial substrate stimulated nodulation.

Controlled-Release Fertilizer and Container Volume to Produce Inga laurina Seedlings

“…This result shows that using sewage sludge as substrate, together with chemical fertilizing, can accelerate forest seedlings growth. A similar pattern was observed for Inga laurina by Jesus et al (2016), where seedlings produced in 115 cm 3 tubes showed similar growth in height and diameter for a production period of 81 days (after transplanting) with fertilization and of 110 days without fertilization. The shortest time to produce suitable seedlings implies in lower production costs, considering the savings with irrigation and labor force for seedling care (Bamberg et al, 2013).…”

“…The DQI varies greatly between species and few literature data is available for Atlantic Forest species. Two other studies were found evaluating this parameter for I. laurina, both using 115 cm 3 plastic tubes, Góes et al (2015) observed values between 0.37 and 0.97, among different treatments, and Jesus et al (2016) verified values of from 0.07 to 0.13, both studies showed values of DQI bellow the ones of the present experiment. Considering a survival rate of at least 90% at 12 months after outplanting, in the conditions of the present study, it was observed that seedlings with DQI equal or higher than 2.62 and 2.50 were suitable to outplanting, respectively, in 110 cm 3 and 280 cm 3 tubes.…”

Seedlings germination aspects of the Carapa guianensis and its ecological conservation for the Amazonian peoples

“…For TAL (Figure 3), the results obtained were different in comparison with Inga laurina (Jesus et al, 2016), where the seedling development did not differ between the better fertility substrate and the one with lower fertility, while here with andirobeira, there were great differences due to the substrate, similar to results to Breu Branco cited by Santos et al (2012). However, it is most important to emphasize that lines in the figures present peaks for TAL and TCR, while the bibliography shows linear behavior, with no peak presence of great prominence.…”

“…Therefore, in andirobeira seedlings, these rates and variations differ from several tree species studied. For example, in Inga laurina (Jesus et al, 2016), there are no high peaks of increase in TCR, and Souza, Santos, Ferreira and Gonçalves (2017) found that Bertholletia excelsa was also without peaks in rates, but rather a linear and continuous increase. Regarding the type of substrate, a similarity was obtained in that, with better fertility, there was a higher TCR.…”