被覆肥料の溶出速度に及ぼす土壌水分の影響

• 資料種別: 記事
• タイトル: 被覆肥料の溶出速度に及ぼす土壌水分の影響
• 著者・編者: 藤沢 英司; 小林 新; 羽生 友治
• 著者標目: 藤沢 英司; 小林 新; 羽生 友治
• タイトル（掲載誌）: 日本土壌肥料学雑誌 = Japanese journal of soil science and plant nutrition
• 巻号年月日等（掲載誌）: 69(6) 1998.12
• 掲載巻: 69
• 掲載号: 6
• 掲載ページ: 582-589
• 掲載年月日（W3CDTF）: 1998-12
• ISSN（掲載誌）: 0029-0610
• ISSN-L（掲載誌）: 0029-0610
• 出版事項（掲載誌）: 東京 : 日本土壌肥料学会 ; 1927-
• 出版地（国名コード）: JP
• 本文の言語コード: jpn
• NDLC: ZR7
• 対象利用者: 一般
• 所蔵機関: 国立国会図書館
• 請求記号: Z18-331
• 連携機関・データベース: 国立国会図書館 : 国立国会図書館雑誌記事索引; https://ndlsearch.ndl.go.jp
• 書誌ID（NDLBibID）: 4617455; http://id.ndl.go.jp/bib/4617455
• 整理区分コード: 632

• 要約等: The release of nutrients from a thermoplastic resin-coated NPK mixed fertilizer were studied at different temperatures and soil moistures, ranging from the near-field moisture capacity to the ievel lower than air-dry soil. From the soil moisture content, water vapor pressure was estimated to carry out the simulation studies. The effects of osmotic potential and diffusion of nutrients out side the granules of the coated fertilizer on the release rate were also discussed. 1) The release rates of the nutrients were higher in the order of nitrogen (ammonium andnitrate), potassium and phosphate. The pattern of each nutrient release fitted well with our simulation model reported previously. 2) The release rate of nitrogen was the same as the estimated value in the solution under the condition in which the soil moisture content levels were higher than 40% (0.7 MPa of water potential) of the maximum water holding capacity. However, the release rate decreased as the level of soil moisture decreased below this point, and became nil at about 100 MPa of water potential. 3) The water vapor pressure was estimated from the moisture content of the soil, and the temperature corresponding to the vapor pressure of pure water was calculated. Using the calculated temperature, the nutrient release was simulated with the proposed model, but the simulated values were slightly higher than the observed values. We considered that the vapor pressure in the close vicinity of the fertilizer granules may have been lower than the estimated value under the low moisture condition in which the solution from the granules tended to stagnate and the diffusion outside the granules decreased.
• DOI: 10.20710/dojo.69.6_582
• オンライン閲覧公開範囲: インターネット公開
• 連携機関・データベース: 科学技術振興機構 : J-STAGE; http://www.jstage.jst.go.jp

• 要約等: The release of nutrients from a thermoplastic resin-coated NPK mixed fertilizer were studied at different temperatures and soil moistures, ranging from the near-field moisture capacity to the ievel lower than air-dry soil. From the soil moisture content, water vapor pressure was estimated to carry out the simulation studies. The effects of osmotic potential and diffusion of nutrients out side the granules of the coated fertilizer on the release rate were also discussed. 1) The release rates of the nutrients were higher in the order of nitrogen (ammonium andnitrate), potassium and phosphate. The pattern of each nutrient release fitted well with our simulation model reported previously. 2) The release rate of nitrogen was the same as the estimated value in the solution under the condition in which the soil moisture content levels were higher than 40% (0.7 MPa of water potential) of the maximum water holding capacity. However, the release rate decreased as the level of soil moisture decreased below this point, and became nil at about 100 MPa of water potential. 3) The water vapor pressure was estimated from the moisture content of the soil, and the temperature corresponding to the vapor pressure of pure water was calculated. Using the calculated temperature, the nutrient release was simulated with the proposed model, but the simulated values were slightly higher than the observed values. We considered that the vapor pressure in the close vicinity of the fertilizer granules may have been lower than the estimated value under the low moisture condition in which the solution from the granules tended to stagnate and the diffusion outside the granules decreased.
• DOI: 10.20710/dojo.69.6_582; https://doi.org/10.20710/dojo.69.6_582
• 関連情報（URI）: https://agriknowledge.affrc.go.jp/RN/2010581519; http://id.ndl.go.jp/bib/4617455; https://ndlsearch.ndl.go.jp/books/R000000004-I4617455
• 連携機関・データベース: 国立情報学研究所 : CiNii Research; https://cir.nii.ac.jp/
• 提供元機関・データベース: Japan Link Center; https://japanlinkcenter.org/top; 学術機関リポジトリデータベース; https://irdb.nii.ac.jp; 雑誌記事索引データベース; https://ndlsearch.ndl.go.jp; CiNii Articles
• 書誌ID（NDLBibID）: 4617455; http://id.ndl.go.jp/bib/4617455
• NII論文ID: 110001747294; 10006070586