Lixiviation and extraction of zinc in a calcareous soil treated with zinc-chelated fertilizers

被引:19
作者
Alvarez, JM
Rico, MI
Obrador, A
机构
[1] Depto. de Quim. y Analisis Agric., E.T.S.I. Agrónomos, Ciudad Universitaria s/n
关键词
Zn chelates; controlled-release; calcareous soil columns; speciation; leaching;
D O I
10.1021/jf9506444
中图分类号
S [农业科学];
学科分类号
09 ;
摘要
When Zn is added to calcareous soils to avoid Zn deficiencies, it can be fixed, if the source is a soluble inorganic salt, and leached, if it is a stable complex. Relative mobilities of Zn-EDTA and Zn-lignosulfonate (LS) chelates added to calcareous soil columns as coated and uncoated fertilizers were determined. Zn-EDTA migrated and distributed throughout the columns. About 51% of the Zn was leached with uncoated fertilizers but only about 10% when coated fertilizers were used. Zn-LS migrated very little, especially with coated fertilizers; the Zn remained mostly in the upper zone of the column and was not leached. The distribution of the added Zn between different fractions of soil was determined by a sequential extraction procedure. When Zn-EDTA was added, the percentage of the most labile fractions increased slightly with respect to the control soil throughout the entire profile of the column. Zn-LS displayed higher increases in the most labile fractions but only in the top layer of the column. Correlations between the extracted fractions (P < 0.001%) showed that in general a dynamic equilibrium existed between them. DTPA-extractable Zn correlated (P < 0.001%) with the two most labile fractions and to a lesser extent with the nonbioavailable forms. Comparisons between coated and uncoated fertilizers show that the presence of coatings benefits Zn-EDTA fertilizers, decreasing the leaching and increasing the amount of biavailable Zn, but had no beneficial effect for Zn-LS fertilizers.
引用
收藏
页码:3383 / 3387
页数:5
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