Question

Given the Assertion and Reason below, Choose one of the following responses Assertion:Plants growing in magnesium deficient soils show extensive interveinal chlorosis in leavesReason:Magnesium is a constituent of chlorophyll

Answer 1

Magnesium in soil solution – Magnesium in soil solution is in equilibrium with the exchangeable magnesium and is readily available for plants.

Exchangeable magnesium – This is the most important fraction for determining the magnesium that is available to plants. This fraction consists of the magnesium held by clay particles and organic matter. It is in equilibrium with magnesium in soil solution.

Non-exchangeable magnesium – Consists of the magnesium that is a constituent of primary minerals in the soil. The break down process of minerals in soils is very slow; therefore, this magnesium fraction is not available to plants.