Exam 15: Calcium,magnesium and Trace Elements

Molybdenum toxicity is most likely to occur under which soil conditions?

Applying 10 kg/ha of which of the following nutrients would most likely cause toxicity to plants?

Dolomitic limestone is a good material to fertilize acid soils with both for both Ca and Mg.

Where the available supply of iron and zinc are low,deficiency of these elements can often be overcome by larger than normal applications of phosphorus fertilizer.

Application of FeSO₄ or ZnSO₄ to many soils is much less effective than the addition of the same amount of micronutrient in the form of a chelate.

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

Which of the following micronutrients is least commonly found to be deficient in plants?

Mycorrhizae help plants overcome deficiencies of zinc,copper,and other micronutrients by increasing the plant uptake of these elements from soil.

Which of the following micronutrients becomes more available for plant uptake as soil pH is increased from pH 6 to pH 8?

Histosols (organic soils)are typically well supplied with nitrogen and phosphorus but deficient in most micronutrients.

Azaleas,pin oaks and other acid-soil loving forest plants have evolved very efficient mechanisms for extracting iron from soils.

Plant symptoms such as interveinal chlorosis on new leaves suggest a deficiency of which micronutrient?

Which of the following nutrient elements is usually present in the soil solution as a simple cation?

Boron is commonly deficient in acid soils because chemical reactions under acid conditions make it less available for plant uptake.

Micronutrient deficiencies are more likely to occur where inorganic chemical fertilizers,rather than organic manures,have been used to stimulate vigorous plant growth.

In an alkaline soil,much of the iron in most iron chelates is rapidly replaced in the chelate complex by which other metallic nutrient?

Which micronutrient is particularly critical for legume plants because of its place in the nitrogenase enzyme that allows Rhizobia-infected legumes to utilize atmospheric nitrogen?

When soil pH is between 4.5 and 5.5,which micronutrient most commonly causes plant toxicity?

Plants generally convert oxidized iron to its reduced form by means of organic reducing agents before the iron is taken up or utilized by the plant.

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