Growth, yield and microbial contamination of lettuce (Lactuca sativa L.) grown under two types of cultivation system as influenced by different organic fertilizers
Blanche Franchette D. Llera | Julie D. Tan | Zeniada C. Gonzaga
Abstract:
Increasing popularity of lettuce in the tropics is becoming evident due to its
widespread use in health and nutrition. Lettuce, a ready-to-eat vegetable is
expected to be safe and of good quality. A study was conducted to assess the
effect of different organic fertilizers on the growth, yield and microbial
contamination of lettuce grown under two types of cultivation system. This was
carried out in a combined analysis arranged in randomized complete block
design with the following treatments: without organic fertilizer (control), cow
manure, fresh chicken dung, dried chicken dung, vermicast and goat manure.
Results showed that lettuce grown under structure performed better than in
open field as manifested by early heading, bigger polar head size, longer and
broader leaves compact head. Among the organic and more fertilizers used,
dried chicken dung and vermicast enhanced the yield and yield components of
lettuce. Microbial contaminants like E. coli were detected in soils applied with
organic fertilizers. The highest microbial count was recorded in fresh chicken
dung-treated soils in both open field and under structure. E. coli contamination in
lettuce leaves was more evident in the open field than under structure.
Regardless of soil and crop samples, treated or not, positive detection of
Salmonella was observed.
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