Effect of acid conditions and of the ameliorating agent on the contents of some micronutrients in plants
1997
Taneva, Maria (N. Poushkarov Institute of Soil Science and Agroecology, Sofia (Bulgaria))
In previous works it was proved that liming two acid soils of different types causes some changes in the mineral composition of alfalfa and sunflower. The contents of Cu depend neither on pH nor on the NPK regime and the type of soil. The contents of Zn, Mn and Fe describe neutralization curves with different declinations. The curves of Al do not show any acid behaviour. Their shape depend on soil pH, soil type or fertilization. Some of them even have a maximum near the acid optimum soil. In this study plant materials of sunflower, maize and ryegrass are analysed. Plants are grown after liming or plastering 4 acid soils on a constant NPK background. It is visible that Cu content is constant, contents of Zn, Mn and in some cases Fe, also formed their already known curves. The contents of Al and sometimes of Fe form shapeless cloud of values. This study in his turn proved that Al is not the yield limiting factor in acid soils, but this tends to be Mn.
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