SW—Soil and Water

McGechan, M.B.

doi:10.1006/bioe.2002.0068

Cited by 43 publications

(12 citation statements)

References 164 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The slower reactions of P into more recalcitrant forms are not captured by this metric [53,54]. As evidenced by the P fraction data, annual soil P surpluses did not remain exclusively in the fast P-binding pools captured by the sorption isotherms.…”

mentioning

confidence: 90%

The fate of phosphorus fertilizer in Amazon soya bean fields

Riskin

Porder

Neill

et al. 2013

Phil. Trans. R. Soc. B

View full text Add to dashboard Cite

Fertilizer-intensive soya bean agriculture has recently expanded in southeastern Amazonia, and whereas intensive fertilizer use in the temperate zone has led to widespread eutrophication of freshwater ecosystems, the effects in tropical systems are less well understood. We examined the fate of fertilizer phosphorus (P) by comparing P forms and budgets across a chronosequence of soya bean fields (converted to soya beans between 2003 and 2008) and forests on an 800 km 2 soya bean farm in Mato Grosso, Brazil. Soya bean fields were fertilized with 50 kg P ha −1 yr −1 (30 kg P ha −1 yr −1 above what is removed in crops). We used modified Hedley fractionation to quantify soil P pools and found increases in less-plant-available inorganic pools and decreases in organic pools in agricultural soils compared with forest. Fertilizer P did not move below 20 cm. Measurements of P sorption capacity suggest that while fertilizer inputs quench close to half of the sorption capacity of fast-reacting pools, most added P is bound in more slowly reacting pools. Our data suggest that this agricultural system currently has a low risk of P losses to waterways and that long time-scales are required to reach critical soil thresholds that would allow continued high yields with reduced fertilizer inputs.

show abstract

mentioning

confidence: 90%

The fate of phosphorus fertilizer in Amazon soya bean fields

Riskin

Porder

Neill

et al. 2013

Phil. Trans. R. Soc. B

View full text Add to dashboard Cite

show abstract

“…) presenta la ventaja de permitir el cálculo de la capacidad de tamponamiento de P del suelo (PBC), que es la capacidad de un suelo para moderar los cambios de P soluble al añadir o extraer P del mismo (Moody, 2007). Por lo general, mayor PBC implica mayor adsorción de P y mayores demandas de fertilización anual para verificar respuesta significativa del cultivo, pero también que el suelo compensa durante mayor tiempo una misma tasa de extracción, o mayores tasas de extracción en intervalos equivalentes de tiempo (McGechan, 2002). Aunque desde un punto de vista cualitativo (porque en este trabajo no se ha estimado numéricamente la PBC) la mayor adsorción en marga a altas concentraciones de fertilizante implicaría una mayor PBC y, consecuentemente, habría que añadir mayores cantidades de estruvita o superfosfato a estos suelos al inicio del cultivo, estos suelos retendrían mayor cantidad de P. La compleja forma de la isoterma de la estruvita en el suelo de granodiorita no se ajustó a ninguno de los modelos descritos.…”

Section: Solubility and Adsorption Of Struvite Phosphorusunclassified

“…), has the advantage of allowing the calculation of soil P buffering capacity (PBC), which is the capacity of a soil to moderate changes in soluble P when adding or extract P from it (Moody, 2007). In general, higher PBC implies higher adsorption of P and higher annual fertilization demands to verify a significant response of the crop, but also that the soil compensates for a longer time the same extraction rate, or higher extraction rates in equivalent intervals of time (McGechan, 2002).…”

Section: Solubility and Adsorption Of Struvite Phosphorusmentioning

confidence: 99%

“…The negative inflection Revista Bio Ciencias 5, e395. puede interpretarse en términos prácticos como un punto de saturación prematuro (McGechan, 2002). La consecuencia es que esta combinación de suelo y fertilizante presenta el menor potencial posible de adsorción de todas las muestras ensayadas.…”

Section: Solubility and Adsorption Of Struvite Phosphorusunclassified

“…La cuantificación del fraccionamiento de P de la estruvita en los dos tipos de suelos estudiados muestra cuán viable es su uso en la agricultura para la producción de olivo y su buen empleo supondría mantener la sostenibilidad agrícola de la industria olivarera de Jaén. point detected at 10 ppm, which implies desorption at higher concentrations, can be interpreted in practical terms as a point of premature saturation (McGechan, 2002). The consequence is that this combination of soil and fertilizer has the lowest possible adsorption potential of all the samples tested.…”

Section: Fraccionamiento Secuencial De Fósforounclassified

See 2 more Smart Citations