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Table 1 Fertility rating, fertilizer response, minimum and maximum available soil water in terms of eight soil texture and site position combinations

From: A spatially explicit approach to modeling biological productivity and economic attractiveness of short-rotation woody crops in the eastern USA

Soil texture Site position Fertilitya rating Fertilizerb response Minimumc available soil water Maximumc available soil water
Sand Upland 0.15 0.60 50 100
Sand Lowland 0.30 0.45 50 100
Sandy loam Upland 0.30 0.50 100 150
Sandy loam Lowland 0.50 0.30 100 150
Clay loam Upland 0.55 0.25 150 200
Clay loam Lowland 0.70 0.10 150 200
Clay Upland 0.65 0.15 200 250
Clay Lowland 0.75 0.05 200 250
  1. aIndex of inherent soil fertility; 1 = high fertility, 0 = low fertility
  2. bIndex of responsiveness to added nutrients that depends on ability to add leaf area
  3. cAvailable soil water in mm H20 m−1 soil depth