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Distribution of Weed Seed Among Soil Structural Units

Published online by Cambridge University Press:  12 June 2017

Mario R. Pareja ,
David W. Staniforth  and
Gilda P. Pareja
Mario R. Pareja
Affiliation:
Dep. Plant Path., Seed and Weed Sci., Iowa State Univ., Ames, IA 50011
David W. Staniforth
Affiliation:
Dep. Plant Path., Seed and Weed Sci., Iowa State Univ. Ames, IA, now deceased
Gilda P. Pareja
Affiliation:
Dep. Stat., Iowa State Univ., Ames, IA
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Abstract

The depth distribution of weed seed, their location in relation to soil aggregates, and the size distribution of soil aggregates were determined in fields that had been under continual conventional or reduced tillage for more than 12 years. Soil samples were taken at three depths in the spring and fall of 1982, and soil aggregates were classified into seven size classes by dry, rotary sieving. Subsamples were deflocculated and washed through sieves to recover weed seed. In the spring, 85% of all seed in the reduced-tillage and 28% of those in the conventional-tillage soil were in the 0- to 5-cm-depth layer. Conventional tillage incorporated weed seed uniformly into various soil aggregate classes, whereas with reduced tillage more seed accumulated in the unaggregated fraction of the soil. In the fall, weed seed distribution in relation to soil depth and among soil aggregate classes was similar for both tillage regimes.

Keywords

Seed-soil micrositesseed dormancyseed germinationsoil aggregationsoil structuretillage
Type
Weed Biology and Ecology
Information
Weed Science , Volume 33 , Issue 2 , March 1985 , pp. 182 - 189
Copyright
Copyright © 1985 by the Weed Science Society of America 

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References

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