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Linking Manure Properties to Phosphorus Solubility in Calcareous Soils

Importance of the Manure Carbon to Phosphorus Ratio

^a USDA-ARS, Northwest Irrigation and Soils Research Lab., 3793N 3600E, Kimberly, ID 83341
^b Smithsonian Tropical Research Institute, Apartado 0843-03092, Balboa, Ancón, Panama, Republica de Panama
^c USDA-ARS, Small Grains and Potato Germplasm Research Unit, Aberdeen, ID 83210

View larger version (23K): [in a new window]   Fig. 1. Change in (a) Olsen P and (b) water-soluble P over 20 d following incorporation of five manures applied at an N-based application rate (120 mg N kg–1) on the Warden soil. Error bars represent the standard deviation of the means.

View larger version (30K): [in a new window]   Fig. 2. Increase in (a, c, e) water-soluble P and (b, d, f) Olsen P following application of five manures at 120, 240, and 360 mg N kg–1 on the (a, b) Warden, (c, d) Portneuf, and (e, f) Declo soils. Error bars represent the standard deviation of the means.

View larger version (32K): [in a new window]   Fig. 3. Increase in (a, c, e) water-soluble P and (b, d, f) Olsen P following application of five manures at 27.5, 55, and 82.5 mg P kg–1 on the (a, b) Warden, (c, d) Portneuf, and (e, f) Declo soils. Error bars represent the standard deviation of the means.

View larger version (17K): [in a new window]   Fig. 4. Relationship between the C/P ratios of manure treatments and Olsen P increase on the Warden, Portneuf, and Declo soils after addition of 82.5 mg P kg–1. Error bars represent the standard deviation of the means.

View larger version (14K): [in a new window]   Fig. 5. Relationship between (a) Olsen P and (b) water-soluble P and microbial P following addition of 82.5 mg P kg–1 (as manure) on the Warden, Portneuf, and Declo soils.