Comparison of five agro-industrial waste-based composts as growing media for lettuce: Effect on yield, phenolic compounds and vitamin C.
Food Chem
; 209: 293-301, 2016 Oct 15.
Article
em En
| MEDLINE
| ID: mdl-27173566
ABSTRACT
Overall phenolic content in plants is on average higher in organic farming, including when renewable resources such as composts are used as soil amendments. In most cases, however, the composting process needs to be optimized to reach the desired outcome. Using composts obtained from chestnut, red and white grapes, olive and broccoli wastes, the relative antioxidative abilities of lettuces cultivated in greenhouse were examined. Results clearly coupled high phenolic levels with high yield in lettuce grown on the chestnut-based compost. A huge accumulation of phenolics was observed with the white grape-based compost, but this coincided with low yield. Three compounds were identified as discriminating factors between treated samples, namely quercetin 3-O-glucoside, luteolin 7-O-glucoside, and cyanidin 3-O-(6â³-malonyl)-ß-d-glucoside; these are also some of the compounds receiving health claims on lettuce consumption. On a negative note, all composts led to decreased vitamin C levels. Collectively, the data suggest that compost amendments can help add value to lettuce by increasing its antioxidant activity as compared to other organic resources.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Fenóis
/
Ácido Ascórbico
/
Solo
/
Lactuca
/
Fertilizantes
/
Agricultura Orgânica
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Resíduos Industriais
Tipo de estudo:
Prognostic_studies
Idioma:
En
Revista:
Food Chem
Ano de publicação:
2016
Tipo de documento:
Article
País de afiliação:
Brasil