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Published online 2 February 2006
Published in Soil Sci Soc Am J 70:454-463 (2006)
DOI: 10.2136/sssaj2005.0031
© 2006 Soil Science Society of America
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Relationships between Extractable Soil Phosphorus and Phosphorus Saturation after Long-Term Fertilizer or Manure Application

Brett L. Allen and Antonio P. Mallarino*

Dep. of Agronomy, Iowa State Univ., Ames, IA 50011


Figure 1
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  		Fig. 1. Relationship between cumulative P application and soil-test P measured with three routine tests for trials with more than 20-yr histories. Curvilinear trends are shown only when the quadratic term was significant (P < 0.05) after a linear term. Different letters by the regression lines indicate significantly different linear coefficients between trials for each soil P test.

 

Figure 2
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  		Fig. 2. Relationship between cumulative P application and Mehlich-3 P saturation index, Mehlich-3 P/PSI (P sorption index), and total P for trials with more than 20-yr histories. Curvilinear trends are shown only when the quadratic term was significant (P < 0.05) after a linear term. The linear coefficients of the relationships for each test did not differ.

 

Figure 3
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  		Fig. 3. Relationship between soil-test P measured with three routine tests and soil total P for trials with more than 20-yr histories. Statistical tests for differences between trends for each soil test are shown in Table 3.

 

Figure 4
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  		Fig. 4. Relationship between soil-test P measured with three routine tests and soil P saturation for trials with more than 20-yr histories. Statistical tests of differences between trends for each soil test are shown in Table 4.

 

Figure 5
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  		Fig. 5. Relationship between Mehlich-3 saturation index and P saturation estimated with three indices of soil-test P/PSI (P sorption index) for trials with more than 20-yr histories. Curvilinear trends are shown only when the quadratic term was significant (P < 0.05) after a linear term. Statistical tests of differences between trends for each saturation index are shown in Table 6.

 




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