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Difficulty: MediumExtracting Specific Details and Facts

In an excerpt from an educational broadcast on high-altitude agronomy, radio host Gabriela Vaca speaks with agricultural researcher Dr. Fernando Silva:

Gabriela Vaca: "Dr. Silva, what specific modification in your irrigation schedule prevented nighttime frost damage in the Altiplano pilot plots?"

Dr. Fernando Silva: "Contrary to the traditional morning routine, we applied shallow flooding to the furrows precisely three hours before sunset. This allowed the saturated topsoil to capture daytime solar radiation and release humid heat overnight, elevating the canopy temperature by 2.4 degrees Celsius."

Gabriela Vaca: "And did you proceed with the synthetic thermal covers mentioned in your initial grant proposal?"

Dr. Fernando Silva: "No, the plastic sheeting proved far too expensive for local farming cooperatives. Instead, we relied solely on the modified water timing combined with perimeter windbreaks made of native totora reeds."

According to Dr. Silva, what precise operational adjustment successfully mitigated nighttime frost damage in the crop canopy?

  1. Shifting furrow flooding to three hours before sunset to retain and release solar heat overnightAnswer
  2. B
    Covering the field rows with synthetic polyethylene sheets before dusk
  3. C
    Increasing the volume of morning irrigation to thaw frozen root systems more rapidly
  4. D
    Replacing standard crops across the Altiplano with genetically modified frost-immune strains

Answer

Shifting furrow flooding to three hours before sunset to retain and release solar heat overnight
The interviewee explicitly confirms that shallow flooding three hours prior to sunset allowed the topsoil to absorb heat and raise nocturnal canopy temperatures by 2.4 degrees Celsius.

Step-by-Step Solution

1
Identify the interviewer's specific question regarding the method used to mitigate frost damage.
The target factual detail is the exact modification to the irrigation routine that protected the canopy.
Listening comprehension for factual extraction requires isolating the core investigative question before evaluating the interviewee's response.
2
Locate Dr. Silva's direct response explaining the operational change.
Dr. Silva specifies that applying shallow flooding three hours before sunset raised the canopy temperature by 2.4 degrees Celsius.
Extracting explicit factual details requires distinguishing between what was actually implemented versus proposed ideas that were rejected (such as plastic sheets) or traditional practices that were abandoned (such as morning watering).

Key Concept

Extracting explicit factual details and technical adjustments from an interview transcript
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Extracting Specific Details and Facts

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