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|
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2
|
what are depressions in the land called?
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5
|
Substance that is toxic to plants, it is used to destroy unwanted vegetation.
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6
|
What is tilling at right angles called?
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7
|
What is it called when crops are sown closely together?
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8
|
What can tillage speed up?
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9
|
What percent is cropland?
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11
|
What is one thing compaction is caused by?
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12
|
What common chemical is found in many herbicides?
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13
|
What is it called when you plant trees to protect the bare soil?
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1
|
Used to loosen surface soil prepare the seed bed and control weeds and pest
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3
|
A practice that reduces wind speed, rate and amount of water movement within the soil so that it can be used for human purposes.
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4
|
If waterways are maintained correctly what does it speed up?
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10
|
What percent of public water supplies contains atrazine
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