ACCUMULATION OF NITRATES IN LETTUCE (Lactuca sativa) DURING STORAGE FROM DIFFERENT GROWING MEDIA

The values of nitrate accumulation in lettuce in all the media (bagasse, rice, coffee, soil, wood shaving, horse manure and sawdust) over the 20 day storage period was above the recommended WHO limit of 500 ppm. Lettuce grown in coffee exhibited the highest NO3-N (2700-2880 ppm) after 10 days. Lettuce from soil (control), rice, and wood shavings had the highest N03-N after 5 days whereas in horse manure, coffee, sawdust and bagasse the highest N03-N was after 10 days. Lettuce from horse-manure, coffee and bagasse. had a general decline in NO3-N after 10 days unlike soil, rice, wood shavings and sawdust which had the opposite effect. Despite the varying trend In N03-N during storage for lettuce from aU the media except rice, visual quality was good after 20 days, Bagassee and sawdust appeared to produce the lowest N03-N and highest quality ratings during storage. ----- En todos los medios (fibra de caria de azticar, arroz, cafe. tierra, virutas de madera, abono de caballo y serrin), la acumulaci6n de nitratos en lechugas durante un periodo de almacenamiento de 20 dias fue superior al limite de 500 ppm recomendado por la OMS. Las lechugas cultivadas en el medio con base de cafe presentaron el nivel mas alto de N03 - N (2700 - 2880 ppm) al cabo de 10 dias, Las lechugas cultivadas en tierra (el control), arroz y virutas de madera presentaron el nivel mls alto de N03 - N al cabo de 5 dias, mientras que las que fueron culitvadas en abono de caballo, cafe, serrfn y fibra de caiia de azticar sufrieron un descenso global al cabo de 10 dias; se produjo 10 contrario en la tierra, el arroz, las virutas de madera y el serrin. A pesar de las variaciones en los cambios del contenido de N03 - N durante el almacenamiento en todos los medios - salvo el arroz - las lechugas presentaron una buena apariencia al cabo de 20 dfas, Seg6n las observaciones, el cultivo de lechugas en un medio de fibra de calia de azticar 0 de serrfn produce el nivel mas bajo de N03 - Ny la mejor calidad durante el almacenamiento.


Issue Date:
Sep 08 1985
Publication Type:
Conference Paper/ Presentation
Language:
English
Total Pages:
7




 Record created 2017-08-04, last modified 2017-08-29

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