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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Residual sodium carbonate index ： ウィキペディア英語版 Residual sodium carbonate index The residual sodium carbonate (RSC) index of irrigation water or soil water is used to indicate the alkalinity hazard for soil. The RSC index is used to find the suitability of the water for irrigation in clay soils which have a high cation exchange capacity. When dissolved sodium in comparison with dissolved calcium and magnesium is high in water, clay soil swells or undergoes dispersion which drastically reduces its infiltration capacity.〔(Managing irrigation water quality, Oregon State University, USA ), Retrieved on 2012-10-04.〕 In the dispersed soil structure, the plant roots are unable to spread deeper in to the soil due to lack of moisture. However, high RSC index water does not enhance the osmotic pressure to impede the off take of water by the plant roots unlike high salinity water. Clay soils irrigation with high RSC index water leads to fallow alkali soils formation.〔(【引用サイトリンク】title= Salinity Risk Assessment for the Queensland Murray-Darling Region (see appendix-2),Queensland Department of Environment and Resource Management )〕〔(【引用サイトリンク】title= Salt-Affected Soils and their Management, refer para 4.7 )〕〔(【引用サイトリンク】title= Karnal / Kallar grass cultivation in sodic alkaline soils in Pakistan )〕 ==RSC index formula== RSC is expressed in meq/l units. RSC should not be higher than 1 and preferably less than +0.5 for considering the water use for irrigation.〔(US Salinity Lab Handbook 60 )〕 The formula for calculating RSC index is: * RSC index = (+ CO3 ) − (+ Mg ) * RSC index = HCO3/61 + CO3/30 – Ca/20 – Mg/12 (in case the ionic concentrations are measured in mg/l or ppm as salts) While calculating RSC index, the water quality present at the root zone of the crop should be considered which would take into account the leaching factor in the field.〔(【引用サイトリンク】title=Salinity management handbook, Water quality, page 85 )〕 Calcium present in dissolved form is also influenced by the partial pressure of dissolved CO2 at the plants root zone in the field water.〔(【引用サイトリンク】title= Phytoremediation of Sodic and Saline-Sodic Soils )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Residual sodium carbonate index」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.