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The advent of chemical fertilizers led the farmers in a certain

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The advent of chemical fertilizers led the farmers in a certain  [#permalink]

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New post 29 Aug 2018, 21:02
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A
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E

Difficulty:

  85% (hard)

Question Stats:

44% (01:51) correct 56% (02:05) wrong based on 111 sessions

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The advent of chemical fertilizers led the fanners in a certain region to abandon the practice of periodically growing a ""green-manure"" crop, such as alfalfa, in a field to rejuvenate its soil. As a result, the soil structure in a typical farm field in the region is poor. So to significantly improve the soil structure, fanners will need to abandon the use of chemical fertilizers.

The argument relies on the assumption that

(A) most, if not all, farmers in the region who abandon the use of chemical fertilizers will periodically grow alfalfa

(B) applying chemical fertilizers to green-manure crops, such as alfalfa, has no positive effect on their growth

(C) the most important factor influencing the soil quality of farm field is soil structure

(D) chemical fertilizers themselves have a destructive effect on the soil structure of farm fields

(E) many, if not all, fanners in the region will not grow green-manure crops unless they abandon the use of chemical fertilizers

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Re: The advent of chemical fertilizers led the farmers in a certain  [#permalink]

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New post 31 Aug 2018, 03:08
Here's my take:

(A) most, if not all, farmers in the region who abandon the use of chemical fertilizers will periodically grow alfalfa
they may grow some other plant instead of alfalfa. eliminate.

(B) applying chemical fertilizers to green-manure crops, such as alfalfa, has no positive effect on their growth
it could have some positive effects, but that doesn't outweigh the cons. eliminate.

(C) the most important factor influencing the soil quality of farm field is soil structure
it could be the second most important factor? too extreme. eliminate.

(D) chemical fertilizers themselves have a destructive effect on the soil structure of farm fields
it could be the case that they don't have a destructive effect. It's just the lack of green planty thingies which is resulting in poor soil structure.

(E) many, if not all, fanners in the region will not grow green-manure crops unless they abandon the use of chemical fertilizers
E better be the answer since we've eliminated the rest.
if fanners can grow green-manure crops without abandoning fertilizers, the argument falls apart. E is a necessary assumption.
Re: The advent of chemical fertilizers led the farmers in a certain &nbs [#permalink] 31 Aug 2018, 03:08
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