Phosphorus fertilizer effects on soil phosphorus pools in acid upland soils
Opinions vary on fertilization strategies in part because of uncertainties in methods assessing P supply across sites. We quantified the fate and extractability of fertilizer P after two to four crops with four to five P levels applied to upland rice (Oryza sativa L.)–soybean [Glycine max (L.) Merr....
| Main Authors: | , , |
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| Format: | Journal Article |
| Language: | Inglés |
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Wiley
2002
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| Online Access: | https://hdl.handle.net/10568/166980 |
| _version_ | 1855537690808680448 |
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| author | Dobermann, Achim George, Thomas Thevs, Niels |
| author_browse | Dobermann, Achim George, Thomas Thevs, Niels |
| author_facet | Dobermann, Achim George, Thomas Thevs, Niels |
| author_sort | Dobermann, Achim |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Opinions vary on fertilization strategies in part because of uncertainties in methods assessing P supply across sites. We quantified the fate and extractability of fertilizer P after two to four crops with four to five P levels applied to upland rice (Oryza sativa L.)–soybean [Glycine max (L.) Merr.] rotations in three experiments in Asia. Soil P pools were measured by Mehlich‐1 extractant, a modified Hedley fractionation and by mixed‐bed resin capsules after 1 and 14 d (resin adsorption quantity, RAQ‐P1 and RAQ‐P14). Without P addition, 84% of the total P was in the NaOH‐Po and residual‐P fractions across sites. Phosphorus fertilization increased Mehlich‐1 P, resin‐P, NaOH‐Pi, H2SO4‐P, RAQ‐P1, and RAQ‐P14 across sites, whereas NaOH‐Po and residual‐P were unchanged. The sum of resin‐P and NaOH‐Pi increased from 10% to between 20 and 30% of the total soil P. Mehlich‐1 P and resin P increased similarly across sites and fitted quadratic models: the increase in Mehlich‐1 P (mg kg−1 per kg P ha−1) ranged from 0.050 at low P rates to >0.125 at >400 kg P ha−1 The increases per unit P of RAQ‐P, NaOH‐Pi, and H2SO4‐P varied among sites. Oxalate‐extractable Fe accounted for most of the variation in NaOH‐Pi and RAQ‐P. Changes in soil P pools in tropical upland Oxisols and Ultisols following P addition are likely better reflected by NaOH‐Pi and RAQ‐P than Mehlich‐1 P and resin P. Improvements in soil P tests are needed to better discriminate the changes in P pools from fertilization across soils. |
| format | Journal Article |
| id | CGSpace166980 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2002 |
| publishDateRange | 2002 |
| publishDateSort | 2002 |
| publisher | Wiley |
| publisherStr | Wiley |
| record_format | dspace |
| spelling | CGSpace1669802025-01-27T15:00:52Z Phosphorus fertilizer effects on soil phosphorus pools in acid upland soils Dobermann, Achim George, Thomas Thevs, Niels phosphorus fertilizers upland soils acid soils Opinions vary on fertilization strategies in part because of uncertainties in methods assessing P supply across sites. We quantified the fate and extractability of fertilizer P after two to four crops with four to five P levels applied to upland rice (Oryza sativa L.)–soybean [Glycine max (L.) Merr.] rotations in three experiments in Asia. Soil P pools were measured by Mehlich‐1 extractant, a modified Hedley fractionation and by mixed‐bed resin capsules after 1 and 14 d (resin adsorption quantity, RAQ‐P1 and RAQ‐P14). Without P addition, 84% of the total P was in the NaOH‐Po and residual‐P fractions across sites. Phosphorus fertilization increased Mehlich‐1 P, resin‐P, NaOH‐Pi, H2SO4‐P, RAQ‐P1, and RAQ‐P14 across sites, whereas NaOH‐Po and residual‐P were unchanged. The sum of resin‐P and NaOH‐Pi increased from 10% to between 20 and 30% of the total soil P. Mehlich‐1 P and resin P increased similarly across sites and fitted quadratic models: the increase in Mehlich‐1 P (mg kg−1 per kg P ha−1) ranged from 0.050 at low P rates to >0.125 at >400 kg P ha−1 The increases per unit P of RAQ‐P, NaOH‐Pi, and H2SO4‐P varied among sites. Oxalate‐extractable Fe accounted for most of the variation in NaOH‐Pi and RAQ‐P. Changes in soil P pools in tropical upland Oxisols and Ultisols following P addition are likely better reflected by NaOH‐Pi and RAQ‐P than Mehlich‐1 P and resin P. Improvements in soil P tests are needed to better discriminate the changes in P pools from fertilization across soils. 2002-03 2024-12-19T12:56:54Z 2024-12-19T12:56:54Z Journal Article https://hdl.handle.net/10568/166980 en Wiley Dobermann, Achim; George, Thomas and Thevs, Niels. 2002. Phosphorus fertilizer effects on soil phosphorus pools in acid upland soils. Soil Science Soc of Amer J, Volume 66 no. 2 p. 652-660 |
| spellingShingle | phosphorus fertilizers upland soils acid soils Dobermann, Achim George, Thomas Thevs, Niels Phosphorus fertilizer effects on soil phosphorus pools in acid upland soils |
| title | Phosphorus fertilizer effects on soil phosphorus pools in acid upland soils |
| title_full | Phosphorus fertilizer effects on soil phosphorus pools in acid upland soils |
| title_fullStr | Phosphorus fertilizer effects on soil phosphorus pools in acid upland soils |
| title_full_unstemmed | Phosphorus fertilizer effects on soil phosphorus pools in acid upland soils |
| title_short | Phosphorus fertilizer effects on soil phosphorus pools in acid upland soils |
| title_sort | phosphorus fertilizer effects on soil phosphorus pools in acid upland soils |
| topic | phosphorus fertilizers upland soils acid soils |
| url | https://hdl.handle.net/10568/166980 |
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