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Effect of Depth and Duration of Seed Burial on Ripgut Brome (Bromus rigidus)

Published online by Cambridge University Press:  12 June 2017

Jean A. Gleichsner  and
Arnold P. Appleby
Jean A. Gleichsner
Affiliation:
Dep. Crop Sci., Oregon State Univ., Corvallis, OR 97331
Arnold P. Appleby
Affiliation:
Dep. Crop Sci., Oregon State Univ., Corvallis, OR 97331
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Abstract

The influence of depth (0 to 30 cm) and duration (1 to 24 months) of burial on the deterioration, germination, and viability of ripgut brome seed was studied in the field. Both surface-sown and buried ripgut brome seed were depleted within 15 months. Persistence of surface-sown seed declined relatively slowly during the first year, falling from 83 to 62 to 23% after 1, 9, and 12 months, respectively. Seed covered by soil, however, germinated more rapidly, with less than 10% of the initial population ungerminated after 1 month at all depths. The mode of seed disappearance was closely related to whether or not the seed was covered with soil. Seed loss at depths of 1 to 30 cm was primarily due to germination in situ, with little effect from viability loss or enforced or induced dormancy. In contrast, the persistence of surface-sown seed was due primarily to induced dormancy for up to 12 months, with viability loss and enforced dormancy becoming important thereafter. Tillage practices aimed at providing favorable germination conditions may reduce ripgut brome seed survival in the soil. Because seed is relatively short lived, seed supply in soil may be reduced by short-term rotation to a crop that allows for effective control of ripgut brome.

Keywords

Ripgut bromeBromus rigidus Roth. # BRORIDormancyseed persistenceBRORI
Type
Weed Biology and Ecology
Information
Weed Science , Volume 37 , Issue 1 , January 1989 , pp. 68 - 72
Copyright
Copyright © 1989 by the Weed Science Society of America 

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