Research article Effects of seedbed covering on emergence of Radiata Pine (Rangiora nursery).
J. M. Balneaves and M. J. Fairhurst
Germination of radiata pine seed covered with a coarse (6 to 7 mm diameter) river-washed gravel was much less than when the covering was fine gravel (3 mm diameter). This was especially so in summer, apparently owing to moisture loss by evaporation (no keywords)
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