Measuring bitterbrush seed production on plants with variable crown density...complete counts per plant suggested

Donald W. Seegrist; Donald L. Neal; Richard L. Hubbard

Treesearch

Measuring bitterbrush seed production on plants with variable crown density...complete counts per plant suggested

Informally Refereed

Authors:

Donald W. Seegrist, Donald L. Neal, Richard L. Hubbard

Year:

1966

Type:

Research Note

Station:

Pacific Southwest Research Station

Source:

Res. Note PSW-RN-130. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 6 p

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Download (PDF 1.01 MB): https://research.fs.usda.gov/download/treesearch/37897.pdf

Abstract

A sampling study was made of the number of bitterbrush seeds per trap from plots in northeastern California. The count per trap had a large variation for each plant. This variation was not reduced to an acceptable low level by grouping the seed traps according to their position relative to the plant crown. In the absence of additional information, it is recommended that seed traps should not be used and that a complete count of bitterbrush seeds per plant be made.

Citation

Seegrist, Donald W.; Neal, Donald L.; Hubbard, Richard L. 1966. Measuring bitterbrush seed production on plants with variable crown density...complete counts per plant suggested. Res. Note PSW-RN-130. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 6 p