2004
DOI: 10.1023/b:plso.0000020970.40167.40
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Phosphorus mobilization in agroforestry: Organic anions, phosphatase activity and phosphorus fractions in the rhizosphere

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Cited by 101 publications
(55 citation statements)
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“…For example, inverse associations between phosphatase activity and soil P i have been observed in weathered soils in tropical forests (Olander and Vitousek 2000). In contrast, at our site, P i fractions were not negatively correlated with phosphatase activities, consistent with a lack of acid phosphomonoesterase suppression in Oxisols following high P additions (250 kg P ha −1 ) in this region (Radersma and Grierson 2004). Similarly, acid phosphomonoesterase suppression did not occur in Oxisols in Brazil following 6 years of cumulative P application of up to 549 kg P ha −1 (Conte et al 2002) and 797 kg P ha −1 (Costa et al 2013).…”
Section: Benefits Of P Fertilization For Microbial and Enzymatic P Cysupporting
confidence: 75%
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“…For example, inverse associations between phosphatase activity and soil P i have been observed in weathered soils in tropical forests (Olander and Vitousek 2000). In contrast, at our site, P i fractions were not negatively correlated with phosphatase activities, consistent with a lack of acid phosphomonoesterase suppression in Oxisols following high P additions (250 kg P ha −1 ) in this region (Radersma and Grierson 2004). Similarly, acid phosphomonoesterase suppression did not occur in Oxisols in Brazil following 6 years of cumulative P application of up to 549 kg P ha −1 (Conte et al 2002) and 797 kg P ha −1 (Costa et al 2013).…”
Section: Benefits Of P Fertilization For Microbial and Enzymatic P Cysupporting
confidence: 75%
“…Characterization of phosphatase activities in weathered soils under cultivation in East Africa is limited to a few studies and mostly acid phosphomonoesterase activity (Bossio et al 2005;Mukuralinda et al 2011;Radersma and Grierson 2004;Verchot and Borelli 2005). Despite the suppression of expression of phosphatases by P i (Nannipieri et al 2011), TSP fertilization in weathered soils in this region at low (25 kg P ha −1 ) and high (250 kg P ha −1 ) rates did not decrease acid phosphomonoesterase activity (Mukuralinda et al 2011;Radersma and Grierson 2004). However, it is not known how activities of acid phosphomonoesterase and additional phosphatases that modulate P cycling may be influenced by the form of P fertilizer in these agroecosystems.…”
Section: Introductionmentioning
confidence: 99%
“…Fine roots and EM hyphae also exude low molecular weight organic acids at rates of 10 mol m 21 fine roots day 21 [38] and 10 mol m 21 hyphae day 21 [39], respectively. A further contribution of organic acids is linked to leached carbon provided by SDGVM, because removal of organic matter is associated with permanent loss of alkalinity from the soil [10,16].…”
Section: Model Developmentmentioning
confidence: 99%
“…A tree may modify or improve growth of another tree or crop by changing the bio-physical conditions and thus establish a better potential environment for the latter (Hunter and Aarssen 1988;Rhoades 1997). Trees can increase system productivity by reducing nutrient losses through leaching into the subsoil, reducing soil erosion, providing protection from wind erosion (Rao et al 1998), reducing weed populations, enhancing resistance to cyclic environmental changes, enhancing efficient utilization and recycling of resources (Liebman and Gallandt 1997;Ong et al 1996) and increasing available nutrients for crops by root exudates or rhizosphere effects (Radersma and Grierson 2004).…”
Section: Introductionmentioning
confidence: 99%