d. Ammonium ions produced in fixation are released into the soil solution An important criterion used to determine the essentiality of plant nutrients states that a. A deficiency of the element makes it impossible for the plant to complete the reproductive stage of its life cycle b. The symptoms resulting from a deficiency of the particular element may be corrected only by supplying this element c. It must be conclusively established that the element, under review, plays a special role in the metabolism of the plant d. A deficiency of the element makes it impossible for the plant to complete the vegetative stage of its life cycle
In tropical soils, nitrogen may be lost from soils through
a. Nitrogen fixation
b. Ammonium fixation
c. The action of lightning
d. The action of denitrifying bacteria
Biological nitrogen fixation is beneficial to agriculture because
a. Nitrogen fixing bacteria release ammonium into the soil solution
b. Nitrogen fixing bacteria increase nitrogen supplies to plant roots
c. Nitrogen released from decomposing plants becomes available for root uptake
d. Ammonium ions produced in fixation are released into the soil solution
An important criterion used to determine the essentiality of plant nutrients states that
a. A deficiency of the element makes it impossible for the plant to complete the reproductive stage of its life cycle
b. The symptoms resulting from a deficiency of the particular element may be corrected only by supplying this element
c. It must be conclusively established that the element, under review, plays a special role in the
d. A deficiency of the element makes it impossible for the plant to complete the vegetative stage of its life cycle
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