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62 <br />APPENDIX B <br />SOIL PRODUCTIVITY INDICES - ORANGE COUNTY, NC <br />Land <br />Soil Capability Estimated Productivity <br />Symbol Soil Series Class Yield Index <br />Aa <br />Altavista <br />2W <br />103 <br />100 <br />Cp <br />Congaree <br />2W <br />98 <br />95 <br />HwB <br />Hiwassee <br />2E <br />93 <br />90 <br />ApB <br />Appling <br />2E <br />88 <br />85 <br />CfB <br />Cecil <br />2E <br />88 <br />85 <br />GeB <br />Georgeville <br />2E <br />88 <br />85 <br />HrB <br />Herndon <br />2E <br />88 <br />85 <br />Lg <br />Lignum <br />2W <br />83 <br />81 <br />HhA <br />Helena - Sedgeville <br />2W <br />78 <br />76 <br />CfC <br />Cecil <br />3E <br />78 <br />76 <br />HwC <br />Hiwassee <br />3E <br />78 <br />76 <br />GeC <br />Georgeville <br />3E <br />73 <br />71 <br />HeB <br />Helena <br />2E <br />73 <br />71 <br />EnB <br />Enon <br />3E <br />73 <br />71 <br />WsB <br />White Store <br />2E <br />73 <br />71 <br />HrC <br />Herndon <br />3E <br />73 <br />71 <br />TaD <br />Tatum <br />3E <br />73 <br />71 <br />WwC <br />White Store -Urban <br />NC <br />73 <br />71 <br />GhC <br />Georgeville -Urban <br />NC <br />73 <br />71 <br />CrB <br />Creedmoor <br />2E <br />68 <br />66 <br />ApC <br />Appling <br />3E <br />68 <br />66 <br />VaB <br />Vance <br />3E <br />68 <br />66 <br />AuB <br />Appling -Urban <br />NC <br />68 <br />66 <br />Ch <br />Chewacla <br />3W <br />63 <br />61 <br />Or <br />Orange <br />4W <br />63 <br />61 <br />IrB <br />Iredell <br />7S <br />58 <br />56 <br />EnC <br />Enon <br />4E <br />58 <br />56 <br />IuB <br />Iredell -Urban <br />NC <br />58 <br />56 <br />G1D <br />Goldston <br />6S <br />53 <br />51 <br />TaE <br />Tatum <br />4E <br />48 <br />47 <br />WmD <br />Wedowee <br />4E <br />43 <br />42 <br />Note: Estimated yields are presented in bushels /acre for the <br />indicator crop, corn. Estimated yields are derived by <br />subtracting an adjustment factor from the raw yields <br />for `each soil series. Adjustment factors are based on <br />the -so-il capability subclass and reflect costs of <br />overcoming soil limitations such as erosion hazard, <br />seasonal wetness, etc. Adjustment factors are: <br />Class 2 - 7 bushels /acre; Class 3 - 12 bushels /acre; <br />Class 4 - 17 bushels /acre; Class 6 - 27 bushels /acre; <br />and Class 7 - 32 bushels /acre. <br />Source: US Department of Agriculture <br />Soil Conservation Service - Raleigh Field Office <br />