Document Detail

Annual Variation of Natural (15)N Abundance in Tea Leaves and Its Practicality as an Organic Tea Indicator.
MedLine Citation:
PMID:  21882848     Owner:  NLM     Status:  Publisher    
To obtain basic knowledge about the relationship between the application of organic fertilizers and the δ(15)N values of leaves of organically grown tea plants, annual variations in the δ(15)N values of the tea leaves were investigated. Although variations did not immediately arise after the application of organic fertilizers, differences in the δ(15)N values between organic and conventional cultivations appeared basically after three years from the beginning of the organic cultivation except when an organic fertilizer with a low δ(15)N value was applied, and the variation depended on the δ(15)N values of the fertilizers. In addition, the effectiveness of the δ(15)N values as a practical indicator of organic teas was examined. The tea leaves collected from organic farms did not always have higher δ(15)N values than the commercially available nonorganic teas. This result demonstrates that it is not easy to discriminate organic teas from nonorganic teas simply by their δ(15)N values.
Nobuyuki Hayashi; Tomomi Ujihara; Eri Tanaka; Yasuhiro Kishi; Hideyuki Ogawa; Hirofumi Matsuo
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-9-1
Journal Detail:
Title:  Journal of agricultural and food chemistry     Volume:  -     ISSN:  1520-5118     ISO Abbreviation:  -     Publication Date:  2011 Sep 
Date Detail:
Created Date:  2011-9-2     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0374755     Medline TA:  J Agric Food Chem     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
National Institute of Vegetable and Tea Science, National Agriculture and Food Research Organization (NARO) , 2769 Kanaya, Shimada, Shizuoka 428-8501, Japan.
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