The efficiency of a hand shift irrigation system can vary based on several factors, including management practices, water distribution uniformity, and soil type. Generally, under good management and maintenance, the efficiency of hand shift irrigation systems typically ranges from 60% to 75%.
Based on the options you provided, 75% would be the maximum efficiency that aligns with effective management practices. Therefore, if you're looking for the most accurate choice, 75% would be the best answer.
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