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Rye sown in the fall and plowed into the soil in early

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Re: Rye sown in the fall and plowed into the soil in early  [#permalink]

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New post 21 Jul 2017, 18:58
chesstitans wrote:
hello, what is the most effective method and what are steps of the method to solve such kind of question?

It is because I completely get lost while finding the answer.

As usual, a good first step is to start with the conclusion: plowing rye into the soil can play no part in effective weed control for major agricultural crops.

Next, make sure you understand the structure of the argument leading up to that conclusion. Otherwise, how will you be able to determine the vulnerability of that argument?

  • First, we are told that "rye sown in the fall and plowed into the soil in early spring leaves a residue that is highly effective at controlling broad-leaved weeds." - Okay, so if you sow rye in the fall and plow it into the soil in early spring, that should help you control broad-leaved weeds.
  • Unfortunately, that highly-effective weed control will only last for about forty-five days.
  • "No major agricultural crop matures from seed in as little as forty-five days" - Thus, the amount of time it takes for a crop to mature from seed is LESS than the amount of time the weed control remains effective. And since you can't simply "reapply" the residue from the rye, you cannot extend that 45-day effective period. This is evidence that sowing and plowing rye might not help protect your crops from broad-leaved weeds after all.
  • Unlike the rye residue that cannot simply be reapplied, synthetic herbicides CAN be reapplied as the crop grows. This fact seems to suggest that using synthetic herbicides is a more effective option than using rye residue. Thus, the author concludes that plowing rye into the soil can play no part in effective weed control for major agricultural crops.

This is what we mean when we talk about "How structural thinking can help" with CR questions (see the Ultimate CR Guide for Beginners for more details). The author presents a highly effective method for controlling broad-leaved weeds, presents a major drawback to that method, and then presents an alternative method that has the same drawback but that can be used repeatedly to address that drawback.

We've identified the conclusion and understand how the author arrived at that conclusion. NOW you can look at the question and analyze each answer choice. How might someone object to this argument? What is a major weakness in the argument? Which answer choice best completes this sentence: "The argument fails to ______."? See if that preliminary analysis helps you with the answer choices.

Good luck!
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Re: Rye sown in the fall and plowed into the soil in early  [#permalink]

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New post 08 Sep 2017, 21:45
D is the right answer.
However, I feel this question is of 700 difficulty level as the average time taken is close to 2:40 Seconds.
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Re: Rye sown in the fall and plowed into the soil in early  [#permalink]

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New post 25 Mar 2018, 18:13
Hi - i agree D is the OA

but a question though on d ....doesn't the test taker assume that the mixing of the two methods, the mixed product is effective ?

It could be that the mixed product is ineffective ?
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Re: Rye sown in the fall and plowed into the soil in early  [#permalink]

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New post 08 Apr 2018, 00:42
bigtooth81 wrote:
I pick A. Major crops don't work, this doesn't mean that minor will not work. So rye may still work for minor crops.


still the conclusion is about the major crops only.it does not matter whether the RYE is helpful for minor crop.still it will not be helpful for major crops
Re: Rye sown in the fall and plowed into the soil in early &nbs [#permalink] 08 Apr 2018, 00:42

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