Nitrogen supply to arugula from pig slurry composts in contrasting soils

Abstract

This study was developed to evaluate nitrogen (N) supply to arugula from composts produced by automated composting of pig slurry (PS). During the composting process, retorted oil shale (ROS) and dicyandiamide (DCD) were added to PS to mitigate gaseous N losses. The study was developed in a greenhouse where four treatments were evaluated, three with compost addition (PS compost, PS compost + ROS, and PS compost + ROS + DCD) and one without compost (control) in two contrasting soils (clayey and sandy-loam). The best result was obtained with the compost without additives (PS compost), which increased the arugula dry matter yield 2.2 times in clayey soil and 6.1 times in sandy-loam soil compared to the control treatment. The presence of ROS in composts reduced arugula dry matter yield in 27% in clayey soil and 35% in sandy-loam, while DCD did not affect arugula dry matter yield. The results of this study show that the addition of ROS to PS during composting reduces N supply to arugula, both in the immediate (first cut) and residual effect (second cut).

POTENCIAL LARVICIDA DOS EXTRATOS AQUOSOS DAS FOLHAS FRESCAS E SECAS DE Eruca sativa (BRASSICACEAE) SOBRE Aedes aegypti (DIPTERA: CULICIDAE) E AVALIAÇÃO QUÍMICA

“…Para avaliação da presença de saponinas, catequinas, taninos e heterosídeos antociânicos foi utilizada a metodologia de Matos et al (1997) com adaptações de Castro et al (2018).…”

“…A Eruca sativa, também conhecida como rúcula, é uma espécie de vegetal de grande valor econômico, sendo no Brasil consumida em forma de salada e adicionada a pizzas por possuir uma mistura de sabores entre picante e amargo. A planta possui demanda nutricional de nitrogênio (N) alta (MONTEIRO et al, 2019). Além do valor nutricional, pesquisas foram feitas e comprovaram seu valor farmacológico, eficiência agro-econômica no consórcio da planta com outras espécies (SÁ et al, 2022), atividade antioxidante, atividade antimicrobiana (BASSYOUNI et al, 2022).…”