The risk of iron deficiency is generally reduced as most of the bedrock, as it undergoes alteration,
provides iron in sufficient amounts to meet crops needs. There is, however, a clearly identifiable
exception: limestone soils. Naturally, these soils contain very little amount of iron, and the small
amounts they do contain are easily immobilised by excess calcium.
Iron inputs should be considered based on the crop type, and are not always easy to control: they
can either be small doses administered through foliar application, or yearly inputs of chelated iron
via the soil, in particular for perennial crops.