Journal Plant Production Science has published 1,098 articles in vol. 1 No.1 to vol. 20 No. 4. Several keywords are attachedto each paper, and totally 6,352 keywords were listed in the past articles. The following lists are summaries of keywordsrelated to carbon, nitrogen, hormone, enzyme, instrument and analysis that appeared in the PPS articles. A keyword listrelated to plants has already been published on vol. 20 No. 4. Numbers in parentheses indicate total number of articlescontaining each keyword. These numbers do not indicate the exact number of papers handling each keyword, becausesome authors did not list the names as keywords. These lists will also be posted on the PPS web page and we plan to beable to jump to the abstract and pdf pages.
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