被覆肥料の溶出速度に及ぼす土壌水分の影響
Digital data available（科学技術振興機構）
Begin reading now
J-STAGE
Holdings of Libraries in Japan
This page shows libraries in Japan other than the National Diet Library that hold the material.
Please contact your local library for information on how to use materials or whether it is possible to request materials from the holding libraries.
other
J-STAGE
DigitalCiNii Research
Search ServiceDigitalYou can check the holdings of institutions and databases with which CiNii Research is linked at the site of CiNii Research.
Bibliographic Record
You can check the details of this material, its authority (keywords that refer to materials on the same subject, author's name, etc.), etc.
- Material Type
- 記事
- Title
- Author/Editor
- 藤沢 英司小林 新羽生 友治
- Periodical title
- 日本土壌肥料学雑誌 = Japanese journal of soil science and plant nutrition
- No. or year of volume/issue
- 69(6) 1998.12
- Volume
- 69
- Issue
- 6
- Pages
- 582-589
- Publication date of volume/issue (W3CDTF)
- 1998-12
- ISSN (Periodical Title)
- 0029-0610
- ISSN-L (Periodical Title)
- 0029-0610
- Publication (Periodical Title)
- 東京 : 日本土壌肥料学会 ; 1927-
- Place of Publication (Country Code)
- JP
- Text Language Code
- jpn
- NDLC
- Target Audience
- 一般
- Holding library
- 国立国会図書館
- Call No.
- Z18-331
- Data Provider (Database)
- 国立国会図書館 : 国立国会図書館雑誌記事索引
- Bibliographic ID (NDL)
- 4617455
- Bibliographic Record Category (NDL)
- 632
- Summary, etc.
- 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
- Access Restrictions
- インターネット公開
- Data Provider (Database)
- 科学技術振興機構 : J-STAGE
- Summary, etc.
- 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
- Related Material (URI)
- Data Provider (Database)
- 国立情報学研究所 : CiNii Research
- Original Data Provider (Database)
- Japan Link Center学術機関リポジトリデータベース雑誌記事索引データベースCiNii ArticlesCiNii Articles
- Bibliographic ID (NDL)
- 4617455
- NAID
- 11000174729410006070586