Stratification requirements for germination of western larch (Larix occidentalis Nutt.) seed.

Frank C. Sorenson

doi:10.2737/PNW-RN-493

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Stratification requirements for germination of western larch (Larix occidentalis Nutt.) seed.

Informally Refereed

Authors:

Frank C. Sorenson

Year:

1990

Type:

Research Note

Station:

Pacific Northwest Research Station

DOI:

https://doi.org/10.2737/PNW-RN-493

Source:

Res. Note PNW-RN-493. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 12 p

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Abstract

A northeast Washington collection of western larch seeds was stratified for 0,10, 20, 40, and 80 days and incubated at 55, 64, and 73 °F. The germination percentage of filled seeds and speed and uniformity of germination were improved by long stratification, particularly at the lowest incubation temperature. Stratified seeds were also nursery sown in early April and May. Emergence occurred when mean air temperatures were low (48-54 °F), which indicated that long stratification should be beneficial in the nursery. First-year seedling height was closely related to date of emergence.

Keywords

Emergence, germination percent, germination rate, incubation temperature, stratification, seedling height

Citation

Sorenson, Frank C. 1990. Stratification requirements for germination of western larch (Larix occidentalis Nutt.) seed. Res. Note PNW-RN-493. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 12 p