The study of the effects of cropping systems on buried weed
seed is very costly. Most of the experiments of this nature were
conducted prior to the introduction of herbicides. New techniques,
material and methods are needed and could result in more research
in this area of study.
A polyester material was experimented with which provided a
means for mechanically washing buried weed seed packets. This was
accomplished through the development of an experimental seed
packet washer. The washer and the polyester material made it
possible to wash the soil from delicate seedlings growing inside
the packets without damage to them. They in turn could be examined
without removal from the seed packets making the procedure many
times more economical.
A seed removal technique was also developed which worked well
in separating weed seed from mineral soil samples. This was
accomplished by making slight modifications in the experimental seed packet washer regarding screening,.slope, water volume and
the usage of various sizes of soil sieves.
An economical bioassay method for studying the effects of crop
leachates on red sorrel and rice germination and growth was also
developed while simultaneously testing cropping system effects on
buried weed seed in the greenhouse and field. This method and technique
holds promise for other types of plant experiments involving
liquid and culture media.
Thirty-seven monoculture cropping systems were tested in the
greenhouse and fourteen in the field for their effects on nine
different buried weed seed species. Evidence is provided to show
that broccoli, beans, asparagus, quackgrass, tomatoes and other
plants fray be inhibitory to the subsequent germination and viability
of the buried seed of Rumex acetosella L., Rumex crispus L.,
Brassica campestris L. and Amaranthus retroflexus L. / Graduation date: 1975
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/25585 |
| Date | 15 October 1974 |
| Creators | Thorsen, Jack Arlen |
| Contributors | Crabtree, Garvin |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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