caa a22 4500 477109357 CHVBK 20180405111604.0 cr unu---uuuuu 170330e19960301xx s 000 0 eng 10.1007/BF00029273 doi (NATIONALLICENCE)springer-10.1007/BF00029273 Residual phosphorus and long-term management strategies for an Ultisol [Elektronische Daten] [B. Linquist, P. Singleton, K. Cassman, K. Keane] Knowledge of residual benefits from previously applied P is crucial to maximize economic returns to current P inputs. We measured the residual benefits of P fertilizer on three summer soybean crops grown on a Hawaiian Ultisol over a three-year period. Four rates of P had been applied to four crops (P build-up phase) prior to the residual phase of this experiment. The P inputs during the build-up phase were (kg P ha−1 per crop): control (OP)=no P inputs; low P (LP)=50, 35, 35, 35; moderate P (MP)=100, 70, 70, 70; and high P (HP)=300, 210, 210, 210. Dry matter yield (DMY) and P uptake in all P regimes declined with each successive crop during the residual phase. The relative decline was greates in the LP regime where DMY declined by 61% and P uptake by 71% during the residual phase. Even with cumulative P inputs of 930 kg P ha−1 (HP), DMY and P uptake declined by 15% ad 36%, respectively, during the residual phase. The decline in P uptake with time was not related to Mehlich-1 extractable P (M1P), Olsen P, or P extracted by iron-oxide impregnated filter paper (FeO-P). Initially, optimum DMY was achieved with a M1P value of 2 mg P kg−1, however, this value increased with time so that by the end of the experiment an M1P value greater than 5 mg P kg−1 did not support maximum yields. The rapid decline of residual P benefits in this soil is in contrast to many reports of the lasting residual P benefits in highly weathered soils. Our results suggest that to sustain crop productivity frequent, small applications of P to this soil may be more economical in the long-term than applying large amounts of P. Kluwer Academic Publishers, 1996 P management nationallicence P fixation nationallicence residual P nationallicence soybean nationallicence soil test P nationallicence Linquist B. Department of Agronomy and Range Science, University of California, 95616, Davis, CA, USA aut Singleton P. NifTAL Center, Department of Agronomy and Soil Science, University of Hawaii, 1000 Holomua Rd., 96779, Paia, HI, USA aut Cassman K. Department of Agronomy, University of Nebraska, Lincoln, NE, USA aut Keane K. NifTAL Center, Department of Agronomy and Soil Science, University of Hawaii, 1000 Holomua Rd., 96779, Paia, HI, USA aut Plant and Soil Kluwer Academic Publishers; gopher://gopher.wkap.nl 184/1(1996-03-01), 47-55 0032-079X 184:1<47 1996 184 11104 https://doi.org/10.1007/BF00029273 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00029273 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Linquist B. Department of Agronomy and Range Science, University of California, 95616, Davis, CA, USA aut NATIONALLICENCE 700 1- Singleton P. NifTAL Center, Department of Agronomy and Soil Science, University of Hawaii, 1000 Holomua Rd., 96779, Paia, HI, USA aut NATIONALLICENCE 700 1- Cassman K. Department of Agronomy, University of Nebraska, Lincoln, NE, USA aut NATIONALLICENCE 700 1- Keane K. NifTAL Center, Department of Agronomy and Soil Science, University of Hawaii, 1000 Holomua Rd., 96779, Paia, HI, USA aut NATIONALLICENCE 773 0- Plant and Soil Kluwer Academic Publishers; gopher://gopher.wkap.nl// 184/1(1996-03-01), 47-55 0032-079X 184:1<47 1996 184 11104 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer