The best way to prevent erosion is to remove
the minimum amount of ______ and re-establish it as soon as possible.
A critical area is ______ to stabilize with vegetation. Whenever possible, critical areas should not be ______.
A non-critical area is an area on which vegetation can be established without ______.
Sensitive areas are those areas next to ______, ______, ______, ______ ______, or other landscape features that are vulnerable to damage by sediment.
- adjacent properties
Permanent vegetative stabilization is required when it is necessary to stabilize an area for more than ______.
Legumes furnish ______ to the soil, an important plant nutrient.
When assessing a site prior to selecting plant materials, consideration should be given to:
- site use and maintenance
Consideration should be given to on-site soil conditions such as:
- soil moisture content
A 50 pound bag of 20-10-5 contains ______ pounds of phosphorus.
Topsoil should be ______ at the beginning of grading operations for later use.
When slopes are steeper than ______:______ (horizontal/vertical), structures may be more effective to control erosion than vegetation.
It is necessary to add ______ to lower acidity (increase the pH).
Soil pH should be no lower than ______ for most grasses and no lower than ______ for legumes.
The amount of lime and/or fertilizer required for good vegetative growth can be determined through ______ ______.
Three factors that contribute to soil slippage are:
a.) high ______ ______
b.) slope ______
c.) poor ______
- Moisture content
Droughty soil can be corrected by:
a.) selecting ______ resistant plants
b.) ______ silt and clay soil or ______ matter with the droughty soil
The problem of wet soil can be handled by:
a.) selecting plants ______ to wet conditions
b.) installing artificial ______ or subsurface ______
- surface, drainage
Four methods for establishing vegetation are:
- planting a shrub or tree, live staking or fascines, mulching without seeding
Sprigging involves planting ______ plants in the treated area.
Sod must be closely ______ together and ______ in place on steep slopes or in areas of concentrated flow.
Immediately following seeding, a mulch of ______ ______ should be applied at ______ tons/acre.
______ insulates the soil from intense heat and cold, and conserves ______.
On steep slopes or areas of concentrated flow, ______ or ______ may be required to properly secure the seeding.
- Mulch blankets
- turf reinforcement mats
The two types of maintenance required for vegetation stabilization are:
______ and ______
Areas planted in the fall should be inspected in the ______.