agro content 2
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25 terms
Terms | Definitions |
|---|---|
 sand | 85% sand, 5% clay, 10% silt |
| loam | 40% sand, 20% clay, 40% silt |
| clay | 35% sand, 40% clay 25% silt |
| structure of soid | determined by the size of the clumps that are stuck together |
| importance of pore spaces | allow water to get through |
| critters that live in soil | worms - create pore spaces |
| soil profile | All the vertical layers or horizons that make up a soil in a particular place |
| sand profile | infiltration - good; water holding - poor; aeration - good |
| silt profile and loam profile | infiltration - medium; water holding - medium; aeration - medium |
| clay profile | infiltration - poor; water holding - good, aeration - poor |
| color in soil tells us what | the different minerals that are in soil |
| nitrogen cycle | the transfer of nitrogen from the atmosphere to the soil, to living organisms, and back to the atmosphere |
| phosphorus cycle | the movement of phosphorus atoms from rocks through the biosphere and hydrosphere and back to rocks |
| Nation Resources Conservation Services or NRCS | helps organizations, people and states/countries protect their land and water resources |
| gully erosion | type of erosion that is the removal of layers of soil, creating channels or ravines too large to be removed by normal tillage operations |
| rill erosion | Erosion by running water in small channels |
| sheet erosion | erosion that Occurs when surface water or wind peel off fairly thin sheets or layers of soil. |
| mass erosion | erosion that occurs when certain types of soil become saturated with water and move down a slope due to gravity |
| contour planting | plowing and planting crops in rows aross the slope of the land rather than up and down |
| strip cropping | the practice of planting one or more crops between rows of other crops to control erosion |
| diversion terraces | ridges of soil across a slope that slows speed of water moving down. provides more farmland |
| waterways | used to prevent gullies on a steep slope. wide ditch planted with permanent grass cover |
| crop rotation | rotating different crops on the same field |
| windbreaks | something that will break the force of the wind, such as the growth of shrubs, bushes or trees |
| conservation tillage | use of special tillers and planting machines that reduce disturbance of soil during planting |
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