1887

oa Agrochemophysica - Amelioration of subsoil acidity in Natal Oxisols by leaching of surface-applied amendments

Volume 4, Issue 1
  • ISSN : 0302-7112

 

Abstract

The large pH dependent CEC in Natal Oxisols effectively limits the downward movement of lime. Although heavy fertilization, particularly with acid-forming nitrogenous fertilizers, increases the rate of movement, relatively small amounts of Ca salts having little ability to neutralize subsoil exchangeable A1 could be leached from limed topsoil. In contrast, bases equivalent to 80% of that applied leached rapidly from gypsum-treated topsoil. Although gypsum could not entirely eliminate subsoil exchangeable Al, it lowered the level of exchangeable Al in the subsoil more effectively than did lime. However, gypsum caused severe loss of exchangeable Mg which could have serious nutritional consequences if not corrected.

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/content/agro/4/1/AJA03027112_129
1972-01-01
2020-09-29

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