Magnesium requirement of field crops on Estonian soils
2002
Loide, V. (Academical Agricultural Society, Tartu (Estonia))
Comparison of the methods of determination of magnesium requirement revealed that different extractions work differently in calcium rich soils. Compared with 0.025N CaCl2 solution, the amount of magnesium extracted by ammonium lactate solution is larger than the amount assimilated by plants on calcium rich soils, which may yield a determination result indicating magnesium deficit. In order to obtain an objective estimate of the magnesium requirement of field soils, the magnesium contents of plants originating from different growing areas was studied. The magnesium content of cereals (winter wheat, summer wheat, barley) in the sprouting phase was to a lesser of greater extent lower than optimum level on soils with both low and high magnesium requirements as established by ammonium lactate method
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