Ca,Mg,S, minor

QUIZ ON Ca, Mg, and S

(18) 1. What is a function of calcium in plants with regards to cell expansion or growth?

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What is meant by the expression that "Calcium is immobile in plants"?_________________________________

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How does the immobility of calcium in plants affect the expression of symptoms of calcium deficiency?

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(18)2. Comment on the value of the following materials as fertilizers for provision of calcium in organic farming.

Phosphate fertilizers _________________________________________________________________________

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Farm manures______________________________________________________________________________

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Fruit by-products ______________ _____________________________________________________________

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(12) 3. List a specific crop production problem that is associated with expression of calciuim deficiency in the following crops.

Apples _____________________________ Tomatoes _______________________________

Carrots _____________________________ Lettuce (cabbage) _________________________

(9) 4. List three functions of magnesium in plants.

a. ________________________________________________________________________________________

b.________________________________________________________________________________________

c.________________________________________________________________________________________

(12) 5. Comment on the value of the following materials as fertilizers for magnesium-nutrition of crops.

Agricultural limestones_______________________________________________________________________

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Epsom salts _______________________________________________________________________________

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Talc or soapstone ___________________________________________________________________________

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(12)6. Comment on the value of the sulfate of potash magnesia as a fertilizer for use in organic farming

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(10) 7. Why is the potential of sulfur-deficient crops of much greater concern to the farmer who uses modern chemical fertililizers than to the organic farmer?

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(9) 8. List three conditions that might occur in soils to induce micronutrient deficiencies in crops.

a. ________________________________________________________________________________________

b.________________________________________________________________________________________

c.________________________________________________________________________________________