Elemental bioavailability in nutrient solutions in relation to complexation reactions

被引：11

作者：

De Rijck, G ^{[1
]}

Schrevens, E ^{[1
]}

机构：

[1] Katholieke Univ Leuven, Fac Agr & Appl Biol Sci, Dept Appl Plant Sci, B-3001 Heverlee, Belgium

来源：

JOURNAL OF PLANT NUTRITION | 1998年 / 21卷 / 05期

关键词：

D O I：

10.1080/01904169809365448

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

Nutrient solutions for plant production are aqueous solutions of inorganic ions, prepared by dissolving salts. The nutrients in these solutions are not completely present as free ions. Dissociation, complexation and precipitation reactions seriously impact elemental speciation and bioavailability. As a result plant roots experience a different nutritional composition. This research describes for the six essential macronutrients the complexation reactions occurring in nutrient solutions, using an inorganic chemical approach. A good knowledge of the chemical reactions occurring in nutrient solutions is the first prerequisite in hydroponic plant nutritional research. The formation of the complexes is represented in figures as a function of the free anion concentration. In nutrient solutions a considerable amount of Ca2+, Mg2+ and SO42- is present as the soluble complexes CaSO4 and MgSO4, reducing their free ion concentration and changing their uptake. The different dissociation forms of carbonate and phosphate, present in nutrient solutions, also form soluble complexes.

引用

页码：849 / 859

页数：11

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