Exam 15: Calcium,magnesium and Trace Elements

Which of the following nutrient elements is usually present in the soil solution as an undissociated acid?

Simply spraying a solution to coat the seeds before planting often provides enough of which micronutrient to meet the needs of the crop?

In the future,as food production is increased in countries around the world,micronutrient deficiencies are likely to become less of a problem than they are today.

Roots of monocotyledonous plant (e.g.grasses)have been shown to take in the entire organo-metallic complex when utilizing chelated sources of micronutrients such as iron.

When organic amendments such as animal or green manures are added to soils,micronutrient availability generally is enhanced by the production of natural chelating agents.

Mycorrhizae help plants avoid toxicities of zinc,copper,and other micronutrients by decreasing the uptake of these elements from soil into the plant shoot.

It is common for some plants growing on a particular soil to suffer from a micronutrient deficiency while other plants growing on the same soil are well supplied with the nutrient in question.

Once a micronutrient ion is introduced into the soil as a chelate,it will remain in that form until taken up by a plant or a microorganism.

The availability of which of the following micronutrients is commonly affected by soil redox potential?

Molybdenum occurs in the soil solution as a complex anion similar to that formed by phosphorus.

Most micronutrients play essential roles in plant metabolism as enzyme activators.

A soluble iron chelate with a very high stability constant will be less effective as a fertilizer material than one with a lower stability constant.

Which method of application generally would require the greatest amount of iron to alleviate an iron deficiency in an orange grove?

Copper deficiency is most likely to occur under which of the following soil conditions?

Which micronutrient element is found in the greatest quantity in most soils?

Because many chelating agents are naturally occurring,a kilogram of zinc generally costs less in the form of zinc-chelate than in the form of zinc sulfate.

Dicot plants are thought to remove chelated micronutrients from their organic ligands before taking metallic cations into their roots.

Plant symptoms such as aborted fruits,dead terminal buds,and misshapen new leaves suggest a deficiency of which micronutrient?

Manganese toxicity is most likely to be a problem under which soil conditions?

Interveinal yellowing of the oldest leaves on a plant is a symptom that suggest a deficiency of Mn or Fe.