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3 INTRODUCTION 4 MATERIALS AND METHODS 8 RESULTS AND DISCUSSION 13 Trends of soil-test Phosphorus over time 13 Effect of annual phosphorus applications on grain yield 20 Soil-test Phosphorus critical concentrations for corn and soybean 24 SUMMARY AND CONCLUSIONS 27 REFERENCES CITED 30 CHAPTER 3: GENERAL CONCLUSIONS 49

Long-term corn and soybean response to phosphorus fertilization in Iowa