Soil P forms and P uptake P under intensive plant growth in the greenhouse
| dc.creator | Randy Killorn | |
| dc.creator | Carlos Henríquez | |
| dc.date | 2005 | |
| dc.date.accessioned | 2026-07-07T02:47:23Z | |
| dc.description | The concentration of available soil (P) isa function of the equilibrium established amongdifferent soil P forms through numerous anddifferent reactions in soil. The objective of thisstudy was to examine the changes in P forms andP supply under exhaustive extraction conditionsin soils from 3 different land use areas. In order toestablish a greenhouse experiment, representativesoil samples (0-20 cm) were taken from threefields located adjacent to one another, in a TypicHapludands in Costa Rica. One field was acoffee plantation (Coffea arabica var Catuai),the second a sugar cane plantation (Saccharumspp. var 611721), and the third a secondaryforest. Sorghum (Sorghum bicolor var Glazer41) was planted in 1-liter pots and harvested4 times consecutively. Treatments were no Pand P application (100 mg kg-1) for each of thedifferent land-use soil samples. Shoot and rootdry matter and total P uptake were determined.Soil samples were taken before and after each ofthe 4 plant growth cycles and analyzed using amodified Hedley et al. (1982) soil P fractionationmethodology. Labile-Pi, NaOH-Pi, HCl-Pi,extractable-Po, and residual-P were determined.Applied P increased labile-Pi, NaOH-Pi andHCl-Pi. Statistical changes were not observedin extractable organic P and residual-P due to Papplication. The NaOH-Pi and HCl-Pi seemed to act as a temporary pool of applied P. The possibleparticipation of residual-P in replenishment oflabile-P and NaOH-Pi was observed. The amountof plant P uptake was closely related to the initialamount of labile-Pi and was higher in coffeethan in forest and sugar cane soils. The labile-Pwas depleted by plant uptake. Rapid changes inreversibly available soil P forms (NaOH-Pi andHCl-Pi) were observed during the experiment.Our results suggest the occurrence of very rapidand dynamic changes between available andunavailable soil P forms in response to fertilizerapplication and plant uptake, supporting the ideaof a continuum among the P forms. | |
| dc.format | application/pdf | |
| dc.identifier | 0377-9424 | |
| dc.identifier | https://www.redalyc.org/articulo.oa?id=43629207 | |
| dc.identifier.uri | http://hdl.handle.net/123456789/422975 | |
| dc.language | en | |
| dc.publisher | Universidad de Costa Rica | |
| dc.relation | http://www.redalyc.org/revista.oa?id=436 | |
| dc.rights | Agronomía Costarricense | |
| dc.source | Agronomía Costarricense (Costa Rica) Num.2 Vol.29 | |
| dc.subject | Agrociencias | |
| dc.title | Soil P forms and P uptake P under intensive plant growth in the greenhouse | |
| dc.type | artículo científico |