1991-03-20_REPORT - C1981008 ‎(2)‎

• Permit No: C1981008
• IBM Index Class Name: Report
• Doc Date: 3/20/1991
• Doc Name: 1990 Annual Reclamation Report
• Permit Index Doc Type: Annual Reclamation Report
• Media Type: D
• Archive: No

TABLE 4
Recommended Fertility Levels for Native and
Improved Range Grasses
Suitability Level
Parameter Excellent Nigh Moderate _Low1 Reference
pH 6.1-7.3 5.6-6.0 5.0-5.5 <5.0 5,7
7.4-7.8 7.9-8.9 >8.9
Organic Matter, % >2.5 1.6-2.5 0.6-1.5 0-0.5 2.8
Ammonium, ppm2 >15 10-15 5-9 0-4 3,6
Nitrate, ppm2 >12 7-12 3-6 0-2 2,3,4,6
Phosphorus, ppm >10 7-10 4-6 0-3 3,6
(NaHCO)
9
Texture SILL SL CL,SCL S,LS,C 8
SICL SC,SIC
1
Fertilizer applications may be beneficial when soil test values occur at these levels.
However, phosphorus responses generally do not occur at the
moderate suitability level (Berg, 1980).
2Nitrogen fertilization is not recommended when organic matter levels are greater than 2.0
percent (Barrett et at., 1980).
3
Berg, 1980.
4
Hertzog, 1983.
5
WDEO, 1985.
6
Sutton et at., 1981.
7
Tiedemann and Lopez, 1982.
8
USDA Forest Service, 1979.
9
Texture abbreviations include: S-sand, LS-loamy sand, SL-sandy loam, SIL-silt loam,
L-loam, SCL-sandy clay loam, CL-clay loam, SICL-silty clay loam, SIC-silty clay,
SC-sandy clay, and C-clay.
11