Soil Phosphorus

Tate, K. R.

doi:10.1007/978-94-009-5105-1_10

Cited by 19 publications

(9 citation statements)

References 135 publications

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“…Replicate, field moist samples (0.5 g dry mass) were extracted sequentially by shaking end over end for 18 h, beginning with 30 mL deionized water plus an anion exchange resin strip (Ionics Inc., Watertown, MA). Anion exchange resins were then extracted using 0.5 mol/L HC1, and the extract was analyzed for PO 4 -P, which is equivalent to bioavailable P in the soil Tate 1984Tate , 1985Wagar et al 1986;Stevenson 1986; Schoenau et all 989).…”

Section: Phosphorus Fractionationmentioning

confidence: 99%

“…The other replicate was extracted immediately with 0.5 mol/L NaHCO 3 , end over end, for 18 h. Subsamples of the nonchloroformtreated bicarbonate extracts were acidified with 1.8 mol/L H 2 SO 4 in order to precipitate the organic compounds out of solution (Tiessen et al 1984;Potter et al 1993). These acidified subsamples were, then analyzed for PO 4 -P, which is equivalent to exchangeable (labile) inorganic P (P ; ) in the soil (Tate 1984(Tate , 1985Tiessen et al 1984;Wagar et al 1986;Schoenau et al 1989).…”

Section: Phosphorus Fractionationmentioning

confidence: 99%

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The Effects of Disturbance Events on Labile Phosphorus Fractions and Total Organic Phosphorus in the Southern Appalachians

Wright

Coleman

1999

Soil Science

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Changes in labile soil phosphorus pools, together with changes in organic matter and total organic soil phosphorus levels, were measured following rhododendron harvest and hurricane windthrow events at the Coweeta Long Term Ecological Research (LTER) site. Seasonal soil samples were 1 taken every 3 months from June 1996 to September 1997. Soil cores were taken along four transects within each study area at distances approximately 1, 5, and 15 m upslope from the stream channel. Levels of resin P were low for all sites and sampling dates (<5 [jug PO 4 -P g soil" 1 ). Levels of bicarbonate inorganic P were <8 (jig PO 4 -P g soil" 1 for all sites and sampling dates, whereas bicarbonate organic P levels were somewhat higher and ranged from 6.5 to 26.6 jjig PO 4 -P g soil" 1. Microbial P levels were the most variable and ranged from 4.5 to 25.8 |xg PO 4 -P g soil" 1. In contrast, total organic P levels were high, 149 to 348 (jug PO 4 -P g soil" 1. For the 3 years after the disturbance events, there were no significant changes in labile phosphorus pools or in total organic phosphorus levels in the soil. This lack of significant differences is likely attributable to the low phosphorus, high P-sorbing status of the soils at Coweeta and the lack of erosion that followed these disturbance events. (Soil Science 1999;164:391-402)

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Section: Phosphorus Fractionationmentioning

confidence: 99%

Section: Phosphorus Fractionationmentioning

confidence: 99%

The Effects of Disturbance Events on Labile Phosphorus Fractions and Total Organic Phosphorus in the Southern Appalachians

Wright

Coleman

1999

Soil Science

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“…However, where high amounts of organic matter are generated in situ from winter cover crops, P may be temporarily immobilised in the organic matter accumulated on the soil surface, especially if the C:P ratio is greater than 300:1. 11 There is therefore a need to investigate the effects of winter cover crops on maize P nutrition, especially during the early crop growth stages. Adequate P nutrition at the seedling stage in maize is critical because deficiency at this stage cannot be remedied by side-dressing as a result of a lack of P mobility in soils.…”

Section: Introductionmentioning

confidence: 99%

High biomass yielding winter cover crops can improve phosphorus availability in soil

2017

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We investigated the effects of high biomass yielding winter cover crops, namely grazing vetch (Vicia dasycarpa L.) and oats (Avena sativa L.), on soil phosphorus (P) availability in low fertiliser input maize-based conservation agriculture systems. Soil samples were collected from the 0-50-mm depth of experimental plots after 4 years of maize-winter cover crop rotations. A sequential fractionation scheme was used to separate total soil P into labile, moderately labile and non-labile organic P (P o) and inorganic (P i) pools. Labile P pools included microbial biomass-P as well as P i and P o pools extracted using 0.5 M NaHCO 3 and 1.0 M HCl. The non-labile P pools were humic-P and 1.0 M H 2 SO 4 extracted P. Soil on the maize-winter cover crop rotations had higher HCl-P i and total P than the soil on the maize-fallow rotation. The cover crops had no significant (p>0.05) effect on NaHCO 3-P o , NaHCO 3-P i , HCl-P o , fulvic acid-P and recalcitrant H 2 SO 4-P fractions. Non-application of fertiliser increased accumulation of humic-P on the maize-oats rotation. Cover crop biomass input explained 73% of the variations in microbial biomass-P and 33% of variations in total labile P. Phosphorus concentration of young maize plants was significantly increased by the cover crops, with a positive correlation to HCl-P i (r s =0.90). This contribution from winter cover crops to P availability in the surface soil suggests that, in the long term, fertiliser P could be reduced in such systems.

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“…Phosphorus availability generally declines over geologic time as fresh weathering inputs diminish and losses remain constant or increase (Walker and Syers, 1976). If P becomes occluded with Fe and Al, it forms secondary minerals that may require hundreds to thousands of years to weather into plant-available forms (Walker and Syers, 1976;Tate, 1985;Stevenson and Cole, 1999). If P becomes occluded with Fe and Al, it forms secondary minerals that may require hundreds to thousands of years to weather into plant-available forms (Walker and Syers, 1976;Tate, 1985;Stevenson and Cole, 1999).…”

Section: Tropical Forest Soilsmentioning

confidence: 99%