Magnesium requirement of Estonian soils
2001
Loide, V. (Estonian Agricultural Univ., Tartu (Estonia))
Of Estonian soils 52 per cent require magnesium and 21.5 per cent are extremely poor in magnesium. In spite of the quite high demand for this element, magnesium-containing fertilizers are applied in relatively small amounts. The aim of this study was to find out how plants are supplied with magnesium through the magnesium content of plants and through the magnesium content of soils, using ammonium lactate (AL-method) and 0.025N CaCl2-extract (Schactschabel method) for extration of soil solutions. It was established that in optimum N, P, K and Ca nutrient conditions, cereals suffer for magnesium deficit. Magnesium deficit was extremely severe in plants grown on calcium rich soils. Also, it was established that in calcium rich soils, available magnesium, extracted from ammonium lactate, is not always assimilable by plants. Therefore the suitability of using this extract for determination of magnesium requirement is questionable
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