Soil Conservation Assessing the National Resources Inventory, Volume 1 (1986) / Chapter Skim
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Appendix
Appendix
Pages 99-110
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From page 99... ...
Specific point within the PSU where inven tory data are collected—a data record is not included in the NRI file for points that are federal, urban and built-up, transportation facilities, water bodies, or streams3 4 14-17 Location code SCS location coder 5 18-21 ML1lA Major Land Resource Area, per USDA Agri culture Handbook No. 296 (December 1981)
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From page 100... ...
6 = Indian tribal and individual trust lands 0 = not applicable Soils suitability rating for agriculture, between I and VIII—class I soil has few restrictions that limit its use; class VIII soil has limitations that nearly preclude its use for commercial crop productions Chief limitation of the soil (except when class p: e = erosion; w = water; s = shallow, droughty, or stony; c = climate Soil loss tolerance factor—indicates acceptable level of annual soil loss, between 1 and 5 tons/acre year Meets prime farmland criteria? :8 1 =yes 2 = no Degree of erosion:9 1 = none or slight 2 = moderate 3 = severe Nonarable due to past erosion?
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From page 101... ...
:l8 1 =yes 2 = no Conservation Conservation practices that are currently in practice 1 use on the land—up to three practices could be identified; whether the practices were identified in fields 1, 2, or 3 is not relevant to priorityl9 See Conservation practice 1 Conservation practice 2 Conservation practice 3 Conservation need K factor R factor C factor P factor Slope length Slope percent See Conservation practice 1 Conservation treatment needed20 Soil credibility factor for USLE Rainfall factor for USLE Cropping management factor for USLE Erosion-control practice factor for USLE Slope length (in feet) for USLE Slope percent for USLE
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From page 102... ...
Estimated average annual tons of soil loss due to wind erosion (in lOOs of tons/year) Dominant soil- and water-related problem inhibiting or preventing conversion of land to cropland22 Secondary soil- and water-related problem inhibiting or preventing conversion of land to cropland23 Dominant other problem inhibiting or preventing conversion of land to cropland24 Effort necessary for conversion to cropland:25 01 = none: can convert by beginning tillage 02 = on-farm: can convert through actions by individual farmers 03 = multiform: informal or formal cooperation between neighbors to install systems 04 = project action required 09 = not applicable, e.g., zero potential 99 = currently cropland, built-up, transportation, or water or Vile, VIIw, VIIs, or class VIII land Potential for conversion to cropland within the foreseeable future: 26 00 = zero potential 01 = conversion unlikely in foreseeable future 02 = medium potential 03 = high potential 99 = currently cropland, built-up, transportation, or water or Vile, VIIw, VIIs, or class VIII soil Wetland type: 00 = not a wetland type 1-20 01-20 = type, as per circular 39, Department of Interior
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From page 103... ...
5 = tidal area shoreline Kind of riparian vegetation: 0 = none (nonriparian area or barren) 1 = trees 2 = shrubs 3 = fortes 4 = grass and grasslike plants 5 = mixed 6 = other Width of the strip of riparian vegetation: 0 = none 1 = less than 100 feet 2 = 100-500 feet 3 = greater than 500 feet Distance from point to nearest occurrence of cropland (in feet)
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From page 104... ...
Residue remains upright over winter? : 1 = yes 2 = no 0 = not cropland Pastureland condition rating: 29 2 = good 3 = fair 4 = poor 9 = not applicable 0 = not pastureland Canopy cover of woody plants, if pastureland or native pasture: 1 = 0-10% 2 = 10-25% 3 = 26-55% 4 = 56-100% 0 = not pastureland Rangeland condition rating (percent climax vegetation)
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From page 105... ...
is at least 5 inches; if less than 5 inches, then stocking based on stem count is given: 900 = poorly stocked 901 = moderately stocked 902 = fully stocked 000 = nonstocked or not forestland Average DBH, for forestland (in inches) Primary plant group for forestland understory composition: 0 = none 1 = woody 2 = fortes 3 = grass and grasslike plants Forage value rating of understory for forestland, based upon percentage of understory production by preferred species: 1 = very high (51-100%)
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From page 106... ...
2The Primary Sample Units (PSUs) compiled by the Iowa State University Statistical Laboratory were located by field personnel on aerial photographs.
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From page 107... ...
Infield 21 contains the next level of land cover/use classification, an alphabetic code for major land cover/use. The letter A will appear in this field for all pastureland and native pasture, rangeland and tundra, forestland, other land in farms, barren land, other lands, rural transportation, and census-sized water areas.
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From page 108... ...
2iFields 32 to 37 contain values for the six factors in the USLE. Instructions referred field personnel to local technical guides, SCS Technical Service Center publications, and Agriculture Handbook No.
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From page 109... ...
30The point was considered forestland if trees were recently harvested but not currently stocked or committed to some other use. Fin Chapter 2 the committee recommends that a supplementary tape be issued containing the Soils-5 identification code and that future inventories contain these data.
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