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20 Cards in this Set
- Front
- Back
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Define Dormancy |
A temporary failure to grow in an environment where conditions are suitable for growth. |
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Define Stratification |
The storing of seeds in specific environments (such as temperature, moisture, medium) for specific periods in order to overcome inhibitors of germination |
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Some seeds require exposure to _____, others are inhibited by _____ |
light |
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Pre-treatments for seeds to encourage prompt germination |
- Drying after a cold soak - Seed coat abraded (scarified) - Waxy substances removed with solvents or acids |
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Grasses |
Many grasses have non-dormant seed which germinates quickly in moist conditions when temperatures are suitable Some require stratification |
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Legumes |
Many require treatment for prompt germination |
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Conifers |
Many have physiological dormancy requiring stratification for prompt germination in the spring |
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Requirements for seed germination and growth |
- Good soil contact for continuous moisture supply is key - Must be warm: temperature depends on species - Full light often best although some species need to be buried for germination |
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When is the best time for direct seeding with non-dormant or stratified seed? Why? |
Spring and fall. Because of suitable moisture temperature and sunlight |
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Dry seeding is the most sensitive to season and site. How can you extend the successful seeding season? |
Mulching |
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Use _____ genetic material |
Local. Dont introduce invasives |
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When selecting or ordering custom mixes consider: |
- Species x environment compatibility - Site conditions - Objectives such as sediment control, soil improvement, forage, ecosystem restoration, competition with other plants, fire hazard, cost |
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What is mulch? |
Usually wood or other vegetable fibre applied to soil surface to provide a better seedbed and also improved stabilization |
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What do mulches do? |
- Reduce rainfall impact - Contribute to soil organic matter - Trap sediment - Maintain soil moisture and often improve germination but then smother the germinants |
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What are tackifiers? |
Various kinds of materials that stick things together to reduce surface erosion and/ or seed movement |
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What is the purpose of mats? |
They are spread out and staked onto slopes for improved resistance to erosion while also providing the benefit of mulch |
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Purpose of rolls |
staked in place to provide terraces with vegetation establishment |
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(T or F) seed incorporation is not recommended for rolls or mats |
True |
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Seeding equipment and techniques |
- Hand - Mechanical spreader - Quad-mounted - Blower - Aerial - Hydroseed |
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Dry seed can be successful on slopes of less than __% |
30% (Where rainfall is heavy and or surfaces smooth, surfaces need to be roughened and or mulches, mats or tackifiers employed) |
