Nutritional, phytochemical, microbial and filth contents of lettuce (Lactuca sativa. L.) and upland Kangkong (Ipomoea aquatica Forss) grown in selected production systems
2009
Nacionales-Arroyo, E.J.H, Philippines Univ. Los Baños, College, Laguna (Philippines)
Lettuce (Lactuca sativa L.) and upland kangkong (Ipomoea aquatica Forssk) were grown to determine the effects of the different production systems on the nutrients, phytochemical, microbial and filth content. Garden soil (Gs) served as the control. Other treatments were Gs with ammophos plus urea (GsAu), Gs with vermicompost (GsVC) and hydroponics (Hss). For lettuce, proximate composition was higher in GsAU. Calcium, P, Fe, K, Mg, Na and Zn were higher in Hss and Gs (except Na and Zn). Vitamin C was higher in GsVC than GsAU, but not with Hss and Gs. Anti-oxidant activity, tannins and flavonoids were higher in Hss. For kangkong, Ca was higher in Gs and GsAu. Fe and phenol were higher in GsVC and Hss. Lettuce and Kangkong had high APC, but did not exceed the acceptable levels. Fecal coliform exceeded acceptable levels (except in Gs, GsAU, and GsVC of lettuce). Filth contents were comparable. Yield was higher in GsVC for kangkong and Hss for lettuce, kangkong was most cost effective in GsVC, and higher in iron and phenol. Lettuce was most cost effective in Hss and higher in Ca, P, Fe, K, Mg, Na, Zn, antioxidant activity, tannin and flavonoid.
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