Agricultural recycling of biodigested vinasse for lettuce production

Abstract

The agricultural use of waste products represents an interesting alternative for nutrient cycling. Biodigested vinasse, the final waste product of vinasse biodigestion and biogas production, can be reused for agricultural purposes. The present work sought to quantify the shoot dry mass production of lettuce plants, as well as foliar nitrogen, phosphorus and potassium content following the application of biodigested vinasse on soil. Biodigested vinasse was produced from anaerobic vinasse digestion, using anaerobic sludge as a source of microorganisms. The treatments, with four replications in entirely randomized design, consisted of anaerobic sludge from a gelatin factory, vinasse in natura, biodigested vinasse and a control treatment. The experiment was conducted over 45 days using 5 L vases and applying a dose equivalent to 150 m 3 ha-1. Lettuce treated with biodigested vinasse showed higher shoot dry mass production and higher accumulation of nitrogen, phosphorus and potassium in its leaves than that treated with vinasse in natura.

Desempenho agronômico de rúcula adubada com vinhaça em diferentes sistemas de cultivo

“…Em pesquisas realizadas com vinhaça em alface, Ueno et al (2014) e Dalri et al (2014) obtiveram incremento na produção de matéria da parte aérea e acúmulo de nutrientes elevando a produtividade e a eficiência de uso da adubação. Santos (2010b) desenvolveu uma solução nutritiva a base de vinhaça para cultivo hidropônico de rúcula que permitiu o crescimento satisfatório da cultura, sendo considerada um adubo barato, com custo cerca de 70% menor que a solução convencionalmente utilizada.…”