The Preventive Measures of Calcium Phosphate Precipitation in Nutrient Solution for Hydroponic Cultivation
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- KANEKO Fuminori
- Chiba Pref. Agric. Exp. Stn.
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- OHASHI Takeshi
- Chiba Pref. Agric Coll.
Bibliographic Information
- Other Title
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- 養液栽培培地におけるリン酸一水素カルシウムなどの沈でん生成機構とその防止対策
- 養液栽培培地におけるリン酸-水素カルシウムなどの沈でん生成機構とその防止対策
- ヨウエキ サイバイ バイチ ニ オケル リンサン スイソ カルシウム ナド ノ
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Abstract
The preventive measures of calcium phosphate precipitation in nutrient solution for hydroponic cultivation were discussed as follows. The formation period, the pH an ion strength which precipitate calcium phosphates (CaHPO_4・2H_2O : brushite ; CaHPO_4 : monetite ; Ca_8H_2(PO_4)_6・5H_2O : OCP) in the Japanese standard solution which is typical composition in Japan were examined. The nutrient solutions were prepared pH 6.4, 6.6, 6.8, 7.0, 7.2 and 7.4 by addition of KOH and ion strength values from 0.023 to 0.045 by addition of KNO_3. The results were summarized as follows. 1) The precipitation of calcium phosphate and more than 80% of appended Mn was complete in the period of 24 hours after the set up of the condition of nutrient solution in which pH was 7.4 and ion strength was 0.040. 2) The precipitation of calcium phosphate was dependent upon pH, p(HPO_4^<2->) and p(Ca^<2+>) of nutrient solution and was found above the condition of nutrient solutions in which pH was 6.6, p(HPO_4^<2->) was 3.91 and p(Ca^<2+>) was 2.70. 3) From the discussion on the calculations of thermodynamic condition of solubility equilibrium of calcium phosphate in Japanese standard solution, brushite, monetite, and OCP precipitated above pH 6.8, 6.6, 6.4, respectively. 4) The preventive measure of calcium phosphate precipitation in nutrient solution for hydroponic cultivation were considered that the pH of nutrient solution was maintained under pH 6.4.
Journal
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- Japanese Journal of Soil Science and Plant Nutrition
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Japanese Journal of Soil Science and Plant Nutrition 64 (3), 312-318, 1993
Japanese Society of Soil Science and Plant Nutrition
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Details 詳細情報について
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- CRID
- 1390001206556410112
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- NII Article ID
- 110001751314
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- NII Book ID
- AN00195767
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- ISSN
- 24240583
- 00290610
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- NDL BIB ID
- 3828431
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- Text Lang
- ja
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- Data Source
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- JaLC
- IRDB
- NDL
- CiNii Articles
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- Abstract License Flag
- Disallowed