national railroad contractors association plant biology
TRANSCRIPT
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National Railroad Contractors Association
Plant Biology
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Plant growth stages
Plant life cycles
Plant types
Plant construction
Plant growth factors
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Seedling – Small succulent – Stage
most easily controlled
Vegetative – Rapid growth
Reproductive – Flowers and seeds
Mature – Post reproductive
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Annual
Biennial
Perennial
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Annuals complete their life cycle in
one year.
Winter annuals
Summer annuals
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Seeds germinate late summer to
early fall,
Flower and produce seed in mid-to
late spring, and
Die the next summer.
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Seeds germinate in the spring,
Flower, produce seeds mid-to late
summer, and
Die in the fall.
Ex-most everything
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Live for two growing seasons. Seeds germinate in spring, summer, or fall
of first year. Plants over winter as basal rosette with
storage root. After exposure to cold, plants flower and
produce seeds in summer of second year. Die in the fall.
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Produce vegetative structure that
allows them to live more than two
years.
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•Overwinters by a perennial root
•Reproduce entirely by seed
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Overwinters
Produces new plants from
reproductive structures
Most also reproduce from seed
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Stolons horizontal aboveground stems
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Creeping roots Underground root
modified for food storage,
vegetative reproduction
Grows deep in soilResistant to control
Soil line
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Rhizomes
horizontal
underground
stems
http://www.wildlifeanalysis.org/movabletype/archives/rhizome.jpg
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Tubers
thick underground
stems on the ends of
rhizomes
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Bulbs
modified underground leaf tissue
Reproducing parts
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Grasses/Sedges
Broadleaves (forbs)
Vines
Trees
Ferns
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• One leaf at germination
• Fibrous root system
•Growing point at soil surface
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•Narrow upright leaves
•Parallel veins running length of leaf
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•2 leaves at germination2 leaves at germination
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•Broadleaves
•Netted veins
•Growing points all over
•Tap root system
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Plant with a weak stem that needs support from
climbing, twining, or creeping along a surface
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Trees - perennial, single main stem
or trunk
Shrubs - perennial, more than one
principal stem, shorter than trees
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Largest group of seedless, vascular plants
Grow in moist places
New fronds (leaf) form from rhizome
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Xylem – moves herbicide, water, nutrients up from roots
Phloem – moves herbicide from foliage down to roots
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Grasses have vascular bundles that contain xylem and phloem in one unit
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Water Transports nutrients and herbicides
from root to leaf Moves sugars and foliar applied
herbicides from leaf to roots
Water is key in photosynthesis Rain carries herbicide to root zone
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Soil Soil texture depends on percentages of sand, silt, clay
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Soil
Coarse or light soil
is high in sand
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Soil
Fine or heavy soils
are high in clay
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Soil
Dark soils are high in organic matter
(OM), decaying plants and animals.
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As Clay As OM As Sand
Adsorption Adsorption Adsorption
Leaching Leaching Leaching
Herbicide Use Herbicide Use Herbicide Use
Application Rate Application Rate Application Rate
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Temperature
As Temperature
Plant activity
Speed of herbicide effect
Warm soils
Persistence of herbicide