Strategic Study of CAE >> 2000, Volume 2, Issue 6
Chlorine Nutrition of Plant and Application of Chlorine-containing Fertilizers
Laboratory of Agrochemistry, College of Resources and Environment, Southwest Agricutural University, Chongqing China 400716
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Abstract
Chlorine is an essential element of plant nutrition. Based on twenty thorough and systematic studies on chlorine nutrition of plant and chlorine-containing fertilizers three new theoretical ideas are proposed.
(1) “Chlorine tolerance” and “critical value of chlorine tolerance of crop”. Plant chlorine tolerance can be divided into three types: (A)Crops of strong chlorine tolerance. It means under the condition of chlorine content of soil>600 mg/kg,the crops can grow normally, (e. g. beet cotton, rice, cucumber, etc. ) (B) Crops of medium chlorine tolerance. The crtical chlorine tolerance values are 300~600 mg/kg. (e. g. wheat, maize, tomato, eggplant,soybean,etc. )(C)Crops of weak chlorine tolerance:The crops critical chlorine tolerance values are 150〜300 mg/kg. (e. g. potato, sweet potato, tobaccos, grape, apple, etc.)
(2) Chlorine allowance of soil. It is the differece between the critical value of chlorine tolerance of plant and chlorine-content of soil.This term cimplies that the higher the chlorine allowance of soil,the much chlorine-contained fartilizer can be applied to the soil.
(3) The residual chlorine content in soil is nearly a constant. Accumulation effect of residual chlorine content not exists in the soil.
These ideas will be beneficial to the application of Chlorine-contained fertilizers and the development of the “United-soda” Process.
Keywords
Types of chlorine tolerance of crops ; chlorine allowance of Soil ; Prospect of chlorine-containing chemical fertilizers
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