AMELIORATION OF SUBSOIL ACIDITY BY APPLICATION OF A COAL-DERIVED CALCIUM FULVATE TO THE SOIL SURFACE

被引：30

作者：

VANDERWATT, HV ^{[1
]}

BARNARD, RO ^{[1
]}

CRONJE, IJ ^{[1
]}

DEKKER, J ^{[1
]}

CROFT, GJB ^{[1
]}

VANDERWALT, MM ^{[1
]}

机构：

[1] CSIR,DIV ENERGY TECHNOL,PRETORIA 0001,SOUTH AFRICA

来源：

NATURE | 1991年 / 350卷 / 6314期

关键词：

D O I：

10.1038/350146a0

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

SUBSOIL acidity is a serious problem in many tropical and subtropical soils 1-3. The high acidity, low calcium contents and often toxic levels of soluble and/or exchangeable aluminum severely impair plant-root development in these soils 1-3. The relative immobility of surface-applied liming materials limits their ability to reduce subsoil acidity. Recently, the use of gypsum or phosphogypsum has been advocated as an alternative to lime 3-7. On the other hand, it is well known that humic substances can mobilize and form complexes with metals in soils 8-11. Here we report that a newly available, coal-derived calcium-fulvate is highly efficient as a carrier of calcium in the soil profile. Moreover, subsoil pH was considerably higher when calcium-fulvate was applied to the soil surface, than when gypsum, calcium-EDTA, Ca(OH)2 or CaCO3 were applied.

引用

页码：146 / 148

页数：3

共 13 条

[1]

Aiken G. R., 1985, HUMIC SUBSTANCES SOI

[2]

[Anonymous], [No title captured]

[3]

Bouldin DR, 1979, CORNELL INT AGR B, V34

[4]

CRONJE IJ, 1988, Patent No. 4770