caa a22 4500 477109292 CHVBK 20180405111604.0 cr unu---uuuuu 170330e19960301xx s 000 0 eng 10.1007/BF00029271 doi (NATIONALLICENCE)springer-10.1007/BF00029271 Soil phosphorus movement and budget after 13 years of fertilized cultivation in the Amazon basin [Elektronische Daten] [Michel Beck, Pedro Sanchez] Agronomic studies on soil phosphorus dynamics have primarily focused on the plant-available inorganic P pool. However organic P and less labile inorganic pools can contribute significantly to plant P uptake. The objectives of this study were to determine the changes in inorganic and organic P pools of varying lability in and below the plowlayer after 13 years of continuous cultivation and fertilization on a Typic Paleudult in Yurimaguas, Peru. The field experiment was established after slash and burn of a secondary forest and included non-fertilized and fertilized treatments. The yearly cropping pattern consisted of an upland rice (Oryza sativa),-corn (Zea mays),-soybean (Glycine max) rotation. A modified version of the Hedley et al. procedure was used to sequentially fractionate soil P into increasingly recalcitrant organic and inorganic pools. Plowlayer accumulation of the fertilizer P occurred in all P pools. The greatest increase was in the NaOH extractable inorganic P pool. In the non-fertilized plots, the organic P decreased by 42%. Phosphorus fertilization resulted in significant movement of P below plowlayer. The accumulation occurred mostly in inorganic and organic P pools that are not quantified by traditional soil-P test methods. In fertilized plots sub-plowlayer total P increased by 90 μg g−1 (87%) while resin extractable P increased only 4 μg g−1. Phosphorus content of the organic P pools below the plowlayer increased by 24 μg g−1 (50%) in fertilized plots. The inclusion of less labile P pools in studies of P movement and the evaluation of P fertilizer residual values could lead to a better understanding of P dynamics and hence better management of P fertilization. Kluwer Academic Publishers, 1996 budget nationallicence movement nationallicence phosphorus nationallicence Beck Michel Department of Soil Science, North Carolina State University, Box 7619, 27695-7619, Raleigh, NC, USA aut Sanchez Pedro Department of Soil Science, North Carolina State University, Box 7619, 27695-7619, Raleigh, NC, USA aut Plant and Soil Kluwer Academic Publishers; gopher://gopher.wkap.nl 184/1(1996-03-01), 23-31 0032-079X 184:1<23 1996 184 11104 https://doi.org/10.1007/BF00029271 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00029271 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Beck Michel Department of Soil Science, North Carolina State University, Box 7619, 27695-7619, Raleigh, NC, USA aut NATIONALLICENCE 700 1- Sanchez Pedro Department of Soil Science, North Carolina State University, Box 7619, 27695-7619, Raleigh, NC, USA aut NATIONALLICENCE 773 0- Plant and Soil Kluwer Academic Publishers; gopher://gopher.wkap.nl// 184/1(1996-03-01), 23-31 0032-079X 184:1<23 1996 184 11104 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer