Quiz on P & K

(20) 1. Define how one would maximize the availability of phosphorus in rock phosphate by listing the conditions mandatory for the use of rock phosphate as a fertilizer.

a. _____________________________________________________________________________________

b. _____________________________________________________________________________________

c. _____________________________________________________________________________________

d. _____________________________________________________________________________________

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(15) Define the following terms:

a. Superphosphate________________________________________________________________________

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b. Phosphorus fixation _____________________________________________________________________

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c. Colloidal rock phosphate _________________________________________________________________

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(15) 3. Comment on the value of the following materials as phosphorus fertilizers.

a. Animal residues or by-products ____________________________________________________________

_______________________________________________________________________________________

b. Plant residues or by-products _____________________________________________________________

_______________________________________________________________________________________

c. Naturally occurring rocks and minerals ______________________________________________________

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(18) 4. Describe the symptoms of advanced potassium deficiency in the following plant organs:

a. Seeds or fruits _________________________________________________________________________

_______________________________________________________________________________________

b. Leaves _______________________________________________________________________________

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c. Stems ________________________________________________________________________________

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(24) 5.What is the meaning of the following terms used to describe the presence of potassium in soils

a. Primary mineral K ______________________________________________________________________

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b. Nonexchangeable K ____________________________________________________________________

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c Exchangeable K ________________________________________________________________________

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d. Soil solution K _________________________________________________________________________

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(8) Comment on the value of the following materials as potassium fertilizers:

a. Animal residues or by-products ____________________________________________________________

_______________________________________________________________________________________

b. Plant residues or by-products _____________________________________________________________

_______________________________________________________________________________________

c. Naturally occurring rocks and minerals ______________________________________________________

_______________________________________________________________________________________

March 20,1999