What type of study is this?

October 5, 2025

Planting Can Be Better Than Direct Seeding of Douglas-Fir

Key Points

Planted douglas-fir seedlings were significantly taller than those that were direct seeded at age 10.
Survival rate for planted seedlings reached 75 percent, higher than the survival of direct seeded trees.
Height growth variability was observed, but overall, nursery growth time positively impacted final height.
Seedlings planted when younger exhibited increased height growth compared to directly seeded seedlings.

Abstract

Abstract Total height and height growth of 10-year-old Douglas-fir seedlings in 1965 have increased directly with the number of years in the nursery, although the relationship is highly variable. Planted seedlings which at age three were 0.29 to 0.48 feet taller than seeded trees, grown from the same seed lot, have become from 2.00 to 4.06 feet taller on the average by age 10. Survival of planted seedlings, which at age 10 averaged 75 percent, was much better than that resulting from sowing of six seeds per spot.

AI에게 질문

Bookmark