medium · Enhanced ACT english
[1] The implementation of 'smart' irrigation systems can reduce agricultural water waste by up to 30 %. [2] These systems utilize soil moisture sensors to determine exactly when a crop needs hydration. [3] The first automated irrigation valves were patented in the 1930s but did not see widespread use for several decades. [4] By delivering water directly to the root zone, the systems also minimize evaporation losses compared to traditional spray methods.
Which choice best accomplishes the writer's goal of maintaining the paragraph's focus on the efficiency of modern technology?
- Deleted, because it introduces a historical tangent that is irrelevant to the discussion of soil moisture sensors and modern efficiency.
- Kept, because it highlights that the primary obstacle to irrigation efficiency has always been a lack of widespread commercial adoption.
- Kept, because it provides historical context that shows how long engineers have been working on the problem of water waste.
- Deleted, because it contradicts the claim in sentence [1] that modern systems are significantly more efficient than those of the past.
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