Untitled

Blake, L.; Johnston, Atholl; Poulton, P. R.; Goulding, Keith

doi:10.1023/a:1025544817872

Cited by 105 publications

(49 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The significant recovery of Pi in the labile fraction suggests that all sources, compost included, resulted in high Pi availability. This is in good agreement with Blake et al (2003) who found that labile Pi (resin Pi plus NaHCO 3 -Pi) accounted on average for 40% of total P values in soils amended with superphosphate or farmyard manure. Our findings demonstrated that the labile Pi fraction accounted for about 30% of total extracted P in fertilized soils.…”

Section: Discussionsupporting

confidence: 92%

“…Total P (Pt) in NaHCO 3 and NaOH extracts was determined following digestion in 0.9 M H 2 SO 4 and (NH 4 ) 2 S 2 O 8 , and Po was determined by the difference between digested and undigested samples. A total of six operationally defined fractions were determined: labile Pi (resin Pi and NaHCO 3 Pi), labile Po (NaHCO 3 Po), moderately labile Po (NaOH Po), Fe/Al-Pi (NaOH Pi), Ca-Pi (1 M HCl Pi), and occluded Pi (90°C 12 M HCl) (Linquist et al, 1997;Blake et al, 2003). Total extractable P was calculated as the sum of all fractions.…”

Section: Phosphorus Fractionationmentioning

confidence: 99%

“…Phosphorus fractionation schemes have been widely utilized to assess the fate of both applied P from fertilization and native P during pedogenesis (Walker and Syers, 1976;Hedley et al, 1982;Sharpley and Smith, 1985;Cross and Schlesinger, 1995;Negassa and Leinweber, 2009). In Headley fractionations of arable temperate soils, added Pi was recovered in operationally defined fractions: labile Pi (resin and NaHCO 3 -extractable Pi), Fe/Al-Pi (NaOH extractable Pi), and Ca-Pi fractions (1 M HCl-extractable Pi) (Wagar et al, 1986;Blake et al, 2003;Negassa and Leinweber, 2009). In highly weathered tropical and subtropical soils, added Pi was primarily recovered in Fe/ Al-Pi and occluded pools (concentrated HCl Pi or concentrated H 2 SO 4 -H 2 O 2 Pi), with labile Pi accounting for a smaller portion of total Pi (Linquist et al, 1997;Buehler et al, 2002;Sims and Pierzynski, 2005;Negassa and Leinweber, 2009).…”

mentioning

confidence: 99%

“…Many previous studies have investigated the effect of time on P fractions from long-term fertilization or land-use trials (Hedley et al, 1982;Sharpley, 1985;Sharpley and Smith, 1985;Blake et al, 2003;Shi et al, 2013;Maltais-Landry et al, 2015) or from short-term lab incubations and greenhouse studies (Hedley et al, 1982;Wagar et al, 1986;Iyamuremye et al, 1996b;Guo et al, 2000;Ochwoh et al, 2005). Fewer studies have investigated growing season changes in P fractions under field conditions.…”

mentioning

confidence: 99%

See 3 more Smart Citations

Seasonal Phosphorus Dynamics in a Volcanic Soil of Northern California

Wilson

Lambert

Dahlgren

2016

Soil Science Soc of Amer J

View full text Add to dashboard Cite

Core Ideas Phosphorous fertility was evaluated in weathered volcanic soil in winegrape production. Seasonal Hedley P fractionations, P sorption, microbial biomass carbon, and DOC were investigated. Application of compost, alone or with TSP, reduced sorption and increased MBC. Labile Pi responded significantly to fertilization despite advanced pedogenesis. Significant labile Pi response in weathered soil may be due to low‐Fe lithology. Phosphorus dynamics and management strategies were investigated in a strongly weathered rhyolitic soil in the northern Coast Ranges of California. Recent conversion of upland, native oak (Quercus spp.) woodland ecosystems to winegrape production has led to a P deficiency in these soils. We investigated the growing season behavior of Hedley phosphorus fractions, the P sorption index (PSI), microbial biomass C (MBC), and dissolved organic C (DOC) in response to a single P application from three sources: composted steer manure (CSM), triple superphosphate (TSP), and mixed compost and triple superphosphate (MIX). Phosphorous sources, equal in P application rate (39 kg ha−1), were applied in the winter of 2012, and soils were sampled in spring, summer, and fall. Labile inorganic P (Pi) (resin Pi + NaHCO3 Pi), Fe/Al‐Pi (NaOH Pi), and total P were significantly (p < 0.01) increased by P application, regardless of source. Calcium‐Pi (HCl Pi), DOC, MBC, and pH were increased, and PSI was reduced, by compost addition. Net extractable Fe/Al‐Pi increased during the study period. Moderately labile organic P (Po) (NaOH Po) declined, independent of fertilization, reflecting background soil P cycling. Calcium‐Pi totals were low (mean 9 mg kg−1 for untreated plots), and other indicators of chemical weathering were high, suggesting an advanced stage of pedogenesis with respect to Walker–Syers P availability. In spite of advanced pedogenesis, labile Pi increased significantly from fertilization and remained elevated throughout the growing season. Results of this study inform P management in highly weathered, P‐fixing soils experiencing P deficiencies.

show abstract

Section: Discussionsupporting

confidence: 92%

Section: Phosphorus Fractionationmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Seasonal Phosphorus Dynamics in a Volcanic Soil of Northern California

Wilson

Lambert

Dahlgren

2016

Soil Science Soc of Amer J

View full text Add to dashboard Cite

show abstract

“…In the literature, unaccounted P balances have been frequently reported (Blake et al 2003;Spears et al 2003;Goel and Noguera 2006). The magnitude of discrepancies depends on many factors (e.g.…”

Section: P Balancementioning

confidence: 99%

Changes in phosphorus fractions at various soil depths following long-term P fertiliser application on a Black Vertosol from south-eastern Queensland

et al. 2007

View full text Add to dashboard Cite

Long-term removal of grain P and soil test data suggested that the Colwell phosphorus (P) extraction from the surface 0.10 m of a Black Vertosol from south-eastern Queensland was a poor indicator of run-down of soil P pools. We proposed that plants were also accessing P from layers below 0.10 m or from surface soil P pools not extracted by the Colwell extraction. Both topsoil and subsoil samples in 1994 and 2003 were collected from nil and 20 kg P/ha per crop treatments in a long-term N × P field experiment established in 1985 for detailed P fractionation. An uncropped reference soil was also taken in 2003 from an adjacent area. The long-term effect of the field treatments on soil P fractions was evaluated by comparing the reference site, which was assumed to represent the original soil condition, to the 2003 samples.Without addition of P fertiliser, 55%, 35%, and 10% of total P removal were from 0 to 0.10, 0.10 to 0.30, and 0.30 to 0.60 m, respectively, compared with the uncropped reference soil. Labile fractions comprising resin, bicarbonate, and hydroxide pools in the top 0.10 m decreased by approximately 60% and accounted for 15% of the total P decrease from 0 to 0.60 m depth. Acid and residual-P fractions decreased by 50% and 20%, respectively, and accounted for ∼20% and 15% of the total P decrease. In contrast, P addition at 20 kg P/ha per crop over 18 crops doubled the resin and bicarbonate inorganic P (NaHCO 3 -Pi) pools in the surface 0.10 m. Hydroxide (NaOH-Pi) and acid extracted inorganic P increased by 25% and 10%, respectively, while the residual-P pool decreased by about 15%. Below 0.10 m, very little P was removed by the first 3 extractants. Most of the P was present in the acid and residual fractions irrespective of fertiliser application. The acid and residual-P dropped by 30% and 12%, respectively, at 0.10-0.30 m and 12% and 8% at 0.30-0.60 m. When comparing the experimental soil samples in 2003 with those in 1994, similar trends were observed in the changes of each soil P fraction. In the surface 0.10 m, acid and residual-P pools decreased greatly and explained almost all of the total P decrease in the surface soil without P input. With P addition, labile pools acted as the main sink for P. The acid pool increased by 7%, while the residual-P showed a decrease in the topsoil. Total P level was elevated noticeably in this soil layer. However, at 0.10-0.30 m depth, acid and residual pools were the dominant fractions and decreased significantly irrespective of P fertiliser addition. Below 0.30 m, no significant changes were detected for each fraction and total P. The results suggest that crops had accessed significant amounts of P at 0.10-0.30 m depth irrespective of P fertiliser application, and that subsoil sampling (0.10-0.30 m) should be considered in order to improve the monitoring of soil P status. However, choice of appropriate extractants for monitoring subsoil P reserves is yet to be undertaken.Additional keywords: Colwell P, long-term cropping effect, P balance, P fractions, P stratificat...

show abstract

Contribution of anthropogenic phosphorus to agricultural soil fertility and food production

Ringeval

Nowak

Nesme

et al. 2014

Global Biogeochemical Cycles

View full text Add to dashboard Cite

Agricultural intensification over the last few decades has been accompanied by the extensive use of anthropogenic phosphorus (P) derived from mined phosphate rock. Given the increasing scarcity of P resources, accurate estimates of the reliance of agriculture on anthropogenic P are required. Here we propose a modeling approach for assessing the contribution of anthropogenic P to agricultural soil fertility and food production. We performed computations at country level, and France was chosen as a typical western European country with intensive agriculture. Four soil P pools were identified based on their bioavailability (labile versus stable) and origin (anthropogenic versus natural). Pool evolution between 1948 and 2009 was estimated by combining international databases and a simple biogeochemical model. An optimization procedure demonstrated the necessity of representing a stable P pool capable of replenishing the labile pool within 14 to 33 years in order to match country-scale observations. Mean simulated P pool sizes for 2009 (0-35 cm soil horizon) were 146, 616, 31, and 156 kgP/ha for natural stable, anthropogenic stable, natural labile, and anthropogenic labile pools, respectively. We found that, on average, 82% (min-max: 68-91%) of soil P (sum of labile and above defined stable) in that year was anthropogenic. The temporal evolution of this contribution is directly related to the integral of chemical fertilizer use over time, starting from 1948. The contribution of anthropogenic P to food production was similar at 84% (min-max: 72-91%), which is greater than budget-based estimates (~50-60%) commonly reported in the literature. By focusing on soil fertility and food production, this study provides a quantitative estimation of human perturbations of the P cycle in agroecosystems.

show abstract

Untitled

Cited by 105 publications

References 12 publications

Seasonal Phosphorus Dynamics in a Volcanic Soil of Northern California

Seasonal Phosphorus Dynamics in a Volcanic Soil of Northern California

Changes in phosphorus fractions at various soil depths following long-term P fertiliser application on a Black Vertosol from south-eastern Queensland

Contribution of anthropogenic phosphorus to agricultural soil fertility and food production

Contact Info

Product

Resources

About