1. Liebig’s Law of the Minimum says that adding plant nutrients in combinations

Question

1. Liebig’s Law of the Minimum says that adding plant nutrients in combinations is likely to give a better result than adding a single nutrient

a. True

b. False

2. The benefit of slash and burn agriculture is that it

a. Reduces soil erosion

b. Mineralizes plant nutrients

c. Lowers soil pH

d. All of the above

3. Phosphorus is a difficult nutrient to manage because

a. It is specifically adsorbed to Fe and Al oxides

b. It can be oxidized and lost as a gas

c. It is an essential nutrient and therefore cannot be near clay minerals

d. It is bound weakly by non-specific electrostatic charge

4. Which one of the following would NOT work to prevent nitrate pollution

a. Limiting the use of irrigation water

b. Timing of fertilizer applications

c. Aerate soils to encourage ammonium oxidation

d. All of the above

5. Which type of organic compound is MOST RESISTANT to decay

a. Fats and waxes

b. Crude proteins

c. Sugars and starches

d. Cellulose

e. Lignin

Thank you!

Explanation / Answer

1) False ,  This concept was originally applied to plant or crop growth, where it was found that increasing the amount of plentiful nutrients did not increase plant growth. Only by increasing the amount of the limiting nutrient was the growth of a plant or crop improved.

2) Mineralize plant nutrients

3) It is an essential nutrient and therefore cannot be near clay minerals

4) Limiting the use of irrigation water

5) Lignin

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