Which of the following sprayers require the minimum volume of spray solution to cover a hectare of wheat crop?
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Motorized Power Sprayers (mist-blowers) atomize liquids into very fine droplets, allowing them to provide complete foliage coverage with significantly less water (low-volume spraying) compared to manual hydraulic sprayers.
Step 1: Understanding the Concept:
Sprayers are classified based on the volume of spray liquid applied per unit area: High Volume (HV): More than \(400 \text{ L/ha}\). Low Volume (LV): \(100\) to \(400 \text{ L/ha}\). Ultra-Low Volume (ULV): Less than \(5 \text{ L/ha}\).
Reducing the required spray volume per hectare improves operational efficiency by minimizing the amount of water that must be transported and mixed. Step 2: Detailed Explanation:
Let us compare the listed sprayers:
- Hand Sprayer, Foot Sprayer, and Knapsack Sprayer: These are manually operated, hydraulic energy sprayers. They produce relatively large droplets and typically operate as high-volume sprayers, requiring \(500\) to \(1000 \text{ L}\) of water to cover one hectare of wheat crop.
- Power Sprayer (such as a motorized mist-blower): This equipment uses a gasoline engine or electric motor to drive a fan or pump, generating high-velocity airflow.
The air stream atomizes the spray liquid into extremely fine, uniform droplets (mists).
Because these fine droplets provide much better surface coverage per unit of liquid, power sprayers can operate as low-volume systems, requiring only \(100\) to \(150 \text{ L}\) of water per hectare.
Therefore, the power sprayer requires the minimum volume of spray solution among the options listed. Step 3: Final Answer:
The correct option is (A).
