Effects of Surfactant-based Seed Grading on Chamaecyparis obtusa before Dry Cold Storage

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To evaluate the impact of surfactant-based seed grading on the germination rates of Chamaecyparis obtusa seeds before dry cold storage.
Used a 0.1% surfactant solution for seed grading before cold storage.
Soaked seeds for 15 minutes to 6 hours to select viable seeds.
Dried selected seeds indoors for 7 days to achieve optimal moisture levels (6-10%).
Conducted germination tests after 6 months of cold storage.
Recovered about 90% of viable seeds regardless of soaking time.
Achieved germination rates exceeding 85% after cold storage.
Demonstrated that pre-storage grading is as effective as post-storage grading for achieving high germination rates.

Experimental procedures enhance germination rates in Chamaecyparis obtusa seeds before cold storage, suggesting new practices for seed producers.

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Keisuke Yamanaka (2026) studied this question.

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