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Published online 2 June 2005
Published in Soil Sci Soc Am J 69:1118-1128 (2005)
DOI: 10.2136/sssaj2004.0279
© 2005 Soil Science Society of America
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Soil-Test Phosphorus and Crop Grain Yield Responses to Long-Term Phosphorus Fertilization for Corn-Soybean Rotations

Jason R. Dodda,b and Antonio P. Mallarinoa,*

a Dep. of Agronomy, Iowa State Univ., Ames, IA 50011
b Formerly a graduate student, now at Pioneer Hi-Bred, Inc., 910 6th Street, Colo, IA 50056



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  		Fig. 1. Soil-test P change over time for three initial P treatments and four annual P rates at Boone. Open symbols indicate data not used for regression models in Table 1. A vertical arrow indicates when applications of the 11- and 22-kg P ha–1 yr–1 rates were discontinued.

 


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  		Fig. 2. Soil-test P change over time for three initial P treatments and four annual P rates at Kanawha. Open symbols indicate data not used for regression models in Table 1. A dotted line and missing symbols in 2 yr for the 33-kg P ha–1 yr–1 rate indicate that soils were not sampled. A vertical arrow indicates when applications of the 11- and 22-kg P ha–1 yr–1 rates were discontinued.

 


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  		Fig. 3. Soil-test P change over time for three annual P application rates at the Nashua.

 


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  		Fig. 4. Relationship between soil-test P and relative yield of corn (Zea mays L.) and soybean [Glycine max (L.) Merr.] across all years of experiments at three Iowa locations (LP, linear-plateau; QP, quadratic-plateau; and EXP, exponential).

 




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