Step 1: Understanding the Question:
This question tests knowledge of experimental design principles.
Step 2: Detailed Explanation:
The principles of experimental design are:
- Randomization (A): Applicable.
- Replication (B): Applicable.
- Local control (D): Applicable.
Segregation (C) is NOT a principle of experimental design.
Thus, segregation is not applicable in forestry experiments.
Step 3: Final Answer:
Thus, segregation is NOT applicable, which corresponds to option (C).
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