In Recent Years the Annual Productivity of Slash-And-Burn Systems Has

question 38

Multiple Choice

In recent years the annual productivity of slash-and-burn systems has tended to decline over that achieved by the traditional shifting cultivation systems of the past.To what is this decline most likely due?

• A)decrease in the length of the fallow period
• B)increase in the period of food production in a given cycle
• C)failure to grow legumes in the cropping system
• D)reduction in the C/N ratio of the soil organic matter
• E)reduction in the use of fertilizers

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Definitions:

Ethylmagnesium Bromide

A chemical reagent used in organic chemistry, specifically as a Grignard reagent, for forming carbon-carbon bonds.

Aqueous Acid

An acid solution where water acts as the solvent, capable of donating hydrogen ions (H+) to bases.

Tertiary Alcohol

An alcohol in which the hydroxyl (-OH) group is attached to a carbon atom that is connected to three other carbon atoms.

Ethylmagnesium Bromide

A Grignard reagent used in organic synthesis to form carbon-carbon bonds, consisting of ethyl group bonded to a magnesium-bromide ion.