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16 Cards in this Set
- Front
- Back
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In Teaming with Microbes the authors say that pesticides, salts from fertilizers, and ____ can kill or injure portions of the soil food web. |
rototilling (tillage) |
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During lecture we examined a photograph of cotton roots growing within the soil profile. In the photograph, many roots grew where ____ |
rtilizer was applied irrigation had occurred bulk density was low The plow pan was broken by a "ripper" or subsoil tillage device |
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Few plants, especially agricultural crops, grow well outside the pH range of 5 to 8. |
True |
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About 20 years ago (Pimentel et al. 1995) the annual costs of soil erosion in the USA were estimated to be in excess of $44 Billion |
True |
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In the assigned reading (Liming Missouri Soils, G9102), the authors indicated that soybean yields might be reduced 18% when soil pH decreases to about 5 |
False |
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Where a healthy, dynamic soil community (e.g. bacteria, nematodes, etc.) is present, nutrient availability to plants can be maintained even when residues of higher C:N are present. |
True |
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“High-traffic” areas around campsites (e.g. around fire pit or tent) become compacted and can have runoff levels ____ than un-compacted areas; erosion and plant moisture stress can result from compaction. Therefore, camping in designated areas is recommended. |
3x Greater |
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In the assigned MU extension guide G9107, we learned that the material most commonly used to adjust soil pH to a higher level is ___ |
Calcium Carbonate |
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An ideal soil will have 25% of its volume as pore spaces, which could be occupied by air and water. |
False |
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In Teaming with Microbes the authors say that ___ are in control of the soil food web because of what they release into the soil. |
Plants |
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In Dr. Terry Tollefson's videos on soil biology he presented several microscopic organisms that were found in the soil sample. Other than bacteria, identify three other microscopic organisms from the video using one well-written sentence |
Along with bacteria, Dr. Tollefson's soil sample also contained mites, rotifers, and tardigrades |
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During lecture, Dr. Burton presented soil test results from two of his farm fields. What contributed to the "excessive" level of phosphorus in one of the fields? |
The property that Dr. Burton purchased had been sprayed with unwarranted amounts of liquid fertilizer, from a local dairy that had closed, on the bottom east quadrant. |
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Sheet Erosion |
Removal of thin layers of soil overtime Severe problem but often escapes notice |
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Rill Erosion |
Areas of concentrated flow that usually follow crop rows Less than 2' by 2' |
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Ephemeral Gully Erosion |
Concentrated flow breaks across crop rows, smoothed with tillage, usually develop in same place each year. |
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Gully Erosion: |
too large to be smoothed/crossed with equipment |
