Adubações Nitrogenada e Potássica no Sorgo Biomassa -Produtividade e Qualidade de Fibra

Abstract

In recent years the worldwide demand for alternative fuel sources has been increasing, and sorghum emerges as a promising plant for the production of ethanol. Therefore, for a competitive exploration, biomass productivity, as well as its fiber quality, some aspects need to be considered. Thus, this study aimed to evaluate the effects of nitrogen and potassium fertilization on yield and fiber quality of sorghum biomass for lignocellulosic ethanol. Experiments were conducted with cultivars CMSXS 7020 and CMSXS 652 in the experimental area of Embrapa Maize and Sorghum in experimental design of randomized blocks with three replications. Treatments of each experiment consisted of a 4x4 factorial, involving four N doses (0, 80, 160 and 240 kg ha-1) and four of K 2 O (0, 60, 120 and 180 kg ha-1) topdressed. In general, only the total dry matter of the CMSXS 652 cultivar was affected by N rates, and maximum yield was obtained with the dose of 130 kg ha-1 , with no effect of doses of K. Fertilization with N and K increased the amounts of cellulose and hemicellulose and reduced lignin and ashes.

Row spacing, plant density, sowing and harvest times for sweet sorghum1

“…However, Santos et al (2014), while investigating the potential of sorghum for biofuel production, obtained results close to those found in this study. For the total dry matter yield of the CMSXS 7020 and CMSXS 652 cultivars, they observed 12.46 t ha -1 and 12.50 t ha -1…”

Composition and growth of sorghum biomass genotypes for ethanol production

“…Thus, biomass of sorghum, with high adaptability, presents high fiber content, besides significant amounts of fermentable sugars, which can be exploited in large scale [21]. However, genotypes of sorghum have a great variation in relation to the content of the cell wall, mainly in relation to lignin [19].…”

Macro and micronutrients uptake in biomass sorghum

“…It is extremely important to know the nutritional needs of plants according to their phenological stages to be able to build fertilization management plans, especially for modern genotypes with a high productive potential (Santos et al 2014). The main recommendations for sorghum fertilization in the country are outdated and apply to grain or forage sorghum cultivars that have a lower biomass generation potential than the biomass sorghum (Ribeiro et al 1999, Souza & Lobato 2004.…”