PRODUÇÃO DE MUDAS DE Dalbergia nigra COM USO COMBINADO DE HIDROGEL E FERTILIZANTES DE LIBERAÇÃO LENTA

Abstract

RESUMO Dalbergia nigra, popularmente conhecida como Jacarandá-da-Bahia, é uma espécie arbórea da família Fabaceae, de extrema importância econômica e ambiental. O objetivo deste trabalho foi avaliar a associação de dois fatores para produção de mudas de D. nigra em viveiro: fertilizante de liberação lenta (FLL) e hidrogel. Foram testados o FLL Osmocote® 14-14-14 nas doses de 0,0; 2,5; 5,0; 7,5 e 10,0 kg/m 3 de substrato, associados à presença ou ausência de hidrogel no substrato para produção das mudas de D. nigra. As mudas foram produzidas em viveiro com sombreamento parcial de 50%, sendo mensurados os parâmetros altura e diâmetro do colo mensalmente, até os 120 dias. As doses de fertilizante apresentaram crescimento de diâmetro de colo e altura superiores ao tratamento sem utilização de FLL. No entanto, as doses testadas de FLL foram semelhantes, assim como os tratamentos com hidrogel e sem hidrogel. Os resultados evidenciam que a aplicação de fertilizante de liberação lenta leva a ganhos significativos de crescimento para a espécie Dalbergia nigra, sendo a dose de 2,5 kg/m 3 de substrato recomendada para a espécie. O hidrogel não influenciou o crescimento das mudas nas condições testadas. PALAVRAS-CHAVE: Fertilização de mudas. Jacarandá-da-Bahia. Osmocote. PRODUCTION OF Dalbergia nigra SEEDLINGS WITH COMBINED USE OF HYDROGEL AND SLOW RELEASE FERTILIZERS ABSTRACT Dalbergia nigra, popularly known as Jacarandá-da-Bahia, is a tree species of the Fabaceae family, of extreme economic and environmental importance. The objective of this work was to evaluate the association of two factors for seedling production of D. nigra in nursery: slow release fertilizer (FLL) and hydrogel. The Osmocote® FLL 14-14-14 was tested at the doses of 0.0; 2.5; 5.0; 7.5 and 10.0 kg / m 3 of substrate, associated with the presence or absence of hydrogel on the substrate for seedlings

Dalbergia nigra (Vell.) grown using hydrogel planting methods in the establishment of a silvopastoral system in a degraded soil

“…Regarding the production of seedlings of D. nigra associating controlled-release fertilizers with hydrogels, another comparative study carried out by Cruz et al (2018) did not find significant growth in root-collar diameter for the species, nor an increase in height. The greatest tendency to estimate growth in root collar diameter in the present study was attributed to WAT in the absence of the hydrogel polymer.…”

“…In studies carried out using controlled-release fertilizers associated with hydrogel in the production of D. nigra seedlings, no influence on growth height was observed in the presence of the polymer (Cruz et al, 2018). For native species in general, studies are not clear about the influence of hydrogel on growth variables.…”

Slow-release fertilizer and hydrogel on the initial growth of camu-camu under different water conditions in a Savannah soil

“…Even though there are studies proving the efficiency of slowrelease fertilizers and hydrogels in the initial development of several agricultural species (Monteiro Neto et al, 2017;Cruz et al, 2018), it is stated that these products must be managed under optimal water conditions and in cultivations containing camu-camu plants of the adequate size. This is because plants below 25 cm of height are negatively affected by the SRF doses associated with the hydrogel use in conditions of low water availability.…”