Step 1: Concept Mechanical rice transplanters are designed to provide uniform spacing for optimal crop growth and easier weeding.
Step 2: Meaning While plant-to-plant spacing can often be adjusted, the row-to-row spacing is usually fixed by the machine's design.
Step 3: Analysis Most commercial 6 or 8 row riding-type transplanters are standardized to a row spacing of 30 cm.
Step 4: Conclusion This standard spacing allows for the use of mechanical cono-weeders between the rows later in the season.
Final Answer: (C)
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