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  • 1
    Online Resource
    Online Resource
    Factors Affecting Phosphate Rock Dissolution in Acid Soil Amended with Liming Materials and Cellulose
    Wiley ; 1996
    In:  Soil Science Society of America Journal Vol. 60, No. 6 ( 1996-11), p. 1596-1601
    Details
    In: Soil Science Society of America Journal, Wiley, Vol. 60, No. 6 ( 1996-11), p. 1596-1601
    Abstract: Coal combustion by‐product (CCBP; a wallboard‐quality gypsum), limestone, and cellulose had been found to influence the dissolution of North Carolina phosphate rock (NCPR) in an acid Lily loam soil (fine‐loamy, siliceous, mesic Typic Hapludult). Laboratory and incubation experiments were carried out in this study to elucidate the mechanisms responsible for the reduced dissolution of NCPR from CCBP application. The major factors responsible for the reduced PR dissolution were (i) an increase in exchangeable Ca + Mg derived from the CCBP, (ii) an increase in soil pH from the small amounts of CaCO 3 in the CCBP material; and (iii) sulfate released from the CCBP resulting in a decrease in P sorption capacity of the amended soil due to competitive sorption between sulfate and phosphate. The further reduction in NCPR dissolution by limestone addition was probably due to the increase in pH and exchangeable Ca relative to CCBP application alone. An increased NCPR dissolution from cellulose addition probably reflected an accelerated depletion of labile P by the cellulose‐induced microbial growth and, hence, biomass production. The four kinetic dissolution parameters, i.e., the half‐life ( t 1/2 ) from a first‐order rate equation, the initial dissolution rate‐ and the average dissolution rate‐related constants ( A and b ) from an Elovich equation, and the potential maximum dissolution of phosphate rock from a Langmuir equation were significantly correlated with pH, the content of exchangeable (Ca + Mg), and P sorption capacity of the CCBP‐amended soil. The t 1/2 and A of NCPR in the acid soil could be predicted with 95% confidence by the three soil variables, i.e., soil pH, P sorption capacity, and exchangeable (Ca + Mg). Both t 1/2 and A could serve as an indicator of the NCPR dissolution potential in soils.
    Type of Medium: Online Resource
    ISSN: 0361-5995 , 1435-0661
    URL: Article
    DOI: 10.2136/sssaj1996.03615995006000060002x
    RVK:
    RA 4845
    Language: English
    Publisher: Wiley
    Publication Date: 1996
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    detail.hit.zdb_id: 2239747-4
    detail.hit.zdb_id: 196788-5
    detail.hit.zdb_id: 1481691-X
    SSG: 13
    SSG: 21
    Location Call Number Limitation Availability
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  • 2
    Online Resource
    Online Resource
    Factors Affecting Phosphate Rock Dissolution in Acid Soil Amended with Liming Materials and Cellulose
    Wiley ; 1996
    In:  Soil Science Society of America Journal Vol. 60, No. 5 ( 1996-09), p. 1596-1601
    Details
    In: Soil Science Society of America Journal, Wiley, Vol. 60, No. 5 ( 1996-09), p. 1596-1601
    Abstract: Coal combustion by‐product (CCBP; a wallboard‐quality gypsum), limestone, and cellulose had been found to influence the dissolution of North Carolina phosphate rock (NCPR) in an acid Lily loam soil (fine‐loamy, siliceous, mesic Typic Hapludult). Laboratory and incubation experiments were carried out in this study to elucidate the mechanisms responsible for the reduced dissolution of NCPR from CCBP application. The major factors responsible for the reduced PR dissolution were (i) an increase in exchangeable Ca + Mg derived from the CCBP, (ii) an increase in soil pH from the small amounts of CaCO 3 in the CCBP material; and (iii) sulfate released from the CCBP resulting in a decrease in P sorption capacity of the amended soil due to competitive sorption between sulfate and phosphate. The further reduction in NCPR dissolution by limestone addition was probably due to the increase in pH and exchangeable Ca relative to CCBP application alone. An increased NCPR dissolution from cellulose addition probably reflected an accelerated depletion of labile P by the cellulose‐induced microbial growth and, hence, biomass production. The four kinetic dissolution parameters, i.e., the half‐life ( t 1/2 ) from a first‐order rate equation, the initial dissolution rate‐ and the average dissolution rate‐related constants ( A and b ) from an Elovich equation, and the potential maximum dissolution of phosphate rock from a Langmuir equation were significantly correlated with pH, the content of exchangeable (Ca + Mg), and P sorption capacity of the CCBP‐amended soil. The t 1/2 and A of NCPR in the acid soil could be predicted with 95% confidence by the three soil variables, i.e, soil pH, P sorption capacity, and exchangeable (Ca + Mg). Both t 1/2 and A could serve as an indicator of the NCPR dissolution potential in soils.
    Type of Medium: Online Resource
    ISSN: 0361-5995 , 1435-0661
    URL: Article
    DOI: 10.2136/sssaj1996.03615995006000050045x
    RVK:
    RA 4845
    Language: English
    Publisher: Wiley
    Publication Date: 1996
    detail.hit.zdb_id: 241415-6
    detail.hit.zdb_id: 2239747-4
    detail.hit.zdb_id: 196788-5
    detail.hit.zdb_id: 1481691-X
    SSG: 13
    SSG: 21
    Location Call Number Limitation Availability
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Kinetics of Phosphate Rock Dissolution in Acidic Soil Amended with Liming Materials and Cellulose
    Wiley ; 1996
    In:  Soil Science Society of America Journal Vol. 60, No. 6 ( 1996-11), p. 1589-1595
    Details
    In: Soil Science Society of America Journal, Wiley, Vol. 60, No. 6 ( 1996-11), p. 1589-1595
    Abstract: Phosphate rock (PR), coal combustion by‐product (CCBP), limestone, and organic materials are promising amendments for low P, acid soils, and two or more of the amendments are commonly applied to improve crop yields in acid soil. However, the interactions between these amendments in acid soil are not fully understood. The effects of CCBP, limestone, and cellulose application on dissolution of North Carolina phosphate rock (NCPR) in an acid Lily loam (fine‐loamy, siliceous, mesicTypic Hapludult) from West Virginia were examined in an incubation study. Based on the ΔP‐NaOH estimation method, ≈ 30% of the added NCPR was dissolved after 60 d of incubation. The NCPR dissolution decreased drastically with increasing rate of CCBP, particularly when it was applied together with limestone, whereas cellulose addition tended to enhance NCPR dissolution. Dissolution of NCPR was well described by first‐order, Elovich, and Langmuir kinetic equations. The average r 2 values between the experimental data of NCPR dissolution and the three models were 0.829*, 0.851**, and 0.930**, respectively, for 17 soil samples with and without amendments. Half‐life ( t 1/2 ) from the first‐order reaction could be employed as a simple measure of the NCPR dissolution rate. Constants A and b derived from the Elovich equation were related to the initial and average dissolution rate of NCPR. The potential maximum dissolution of PR from the Langmuir equation provided an estimate of the dissolution extent of NCPR. All four kinetic parameters, particularly t 1/2 and A , were closely correlated with CCBP application rates. These parameters appeared useful in evaluating the effects of CCBP application on NCPR dissolution in the acid soil and might also be applicable to predicting PR dissolution for a wide range of soils with different properties.
    Type of Medium: Online Resource
    ISSN: 0361-5995 , 1435-0661
    URL: Article
    DOI: 10.2136/sssaj1996.03615995006000060001x
    RVK:
    RA 4845
    Language: English
    Publisher: Wiley
    Publication Date: 1996
    detail.hit.zdb_id: 241415-6
    detail.hit.zdb_id: 2239747-4
    detail.hit.zdb_id: 196788-5
    detail.hit.zdb_id: 1481691-X
    SSG: 13
    SSG: 21
    Location Call Number Limitation Availability
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    Online Resource
  • 4
    Online Resource
    Online Resource
    Kinetics of Phosphate Rock Dissolution in Acidic Soil Amended with Liming Materials and Cellulose
    Wiley ; 1996
    In:  Soil Science Society of America Journal Vol. 60, No. 5 ( 1996-09), p. 1589-1595
    Details
    In: Soil Science Society of America Journal, Wiley, Vol. 60, No. 5 ( 1996-09), p. 1589-1595
    Abstract: Phosphate rock (PR), coal combustion by‐product (CCBP), lime‐stone, and organic materials are promising amendments for low P, acid soils, and two or more of the amendments are commonly applied to improve crop yields in acid soil. However, the interactions between these amendments in acid soil are not fully understood. The effects of CCBP, limestone, and cellulose application on dissolution of North Carolina phosphate rock (NCPR) in an acid Lily loam (fine‐loamy, siliceous, mesicTypic Hapludult) from West Virginia were examined in an incubation study. Based on the ΔP‐NaOH estimation method, ≈ 30% of the added NCPR was dissolved after 60 d of incubation. The NCPR dissolution decreased drastically with increasing rate of CCBP, particularly when it was applied together with limestone, whereas cellulose addition tended to enhance NCPR dissolution. Dissolution of NCPR was well described by first‐order, Elovich, and Langmuir kinetic equations. The average r 2 values between the experimental data of NCPR dissolution and the three models were 0.829*, 0.851**, and 0.930**, respectively, for 17 soil samples with and without amendments. Half‐life ( t 1/2 ) from the first‐order reaction could be employed as a simple measure of the NCPR dissolution rate. Constants A and b derived from the Elovich equation were related to the initial and average dissolution rate of NCPR. The potential maximum dissolution of PR from the Langmuir equation provided an estimate of the dissolution extent of NCPR. All four kinetic parameters, particularly t 1/2 and A , were closely correlated with CCBP application rates. These parameters appeared useful in evaluating the effects of CCBP application on NCPR dissolution in the acid soil and might also be applicable to predicting PR dissolution for a wide range of soils with different properties.
    Type of Medium: Online Resource
    ISSN: 0361-5995 , 1435-0661
    URL: Article
    DOI: 10.2136/sssaj1996.03615995006000050044x
    RVK:
    RA 4845
    Language: English
    Publisher: Wiley
    Publication Date: 1996
    detail.hit.zdb_id: 241415-6
    detail.hit.zdb_id: 2239747-4
    detail.hit.zdb_id: 196788-5
    detail.hit.zdb_id: 1481691-X
    SSG: 13
    SSG: 21
    Location Call Number Limitation Availability
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  • 5
    Online Resource
    Online Resource
    Ionic Strength Effects on Sulfate and Phosphate Adsorption on γ‐Alumina and Kaolinite: Triple‐Layer Model
    Wiley ; 1997
    In:  Soil Science Society of America Journal Vol. 61, No. 3 ( 1997-05), p. 784-793
    Details
    In: Soil Science Society of America Journal, Wiley, Vol. 61, No. 3 ( 1997-05), p. 784-793
    Abstract: It is known that PO 4 is retained by soils through ligand exchange, i.e., inner sphere complexation, but the mechanism for SO 4 adsorption at the mineral‐water interface has been in debate. By studying the effects of ionic strength on ion adsorption, it is possible to distinguish between inner and outer sphere ion surface complexes. This study was conducted to evaluate ionic strength effects on SO 4 and PO 4 adsorption on γ‐Al 2 O 3 and kaolinite at varying solution pH (3–11), and to infer SO 4 and PO 4 adsorption mechanisms at the mineral‐water interface. The adsorption of SO 4 on γ‐Al 2 O 3 and kaolinite decreased monotonically with increasing solution pH and was markedly reduced by increasing the concentration of background electrolyte. On the other hand, PO 4 adsorption on γ‐Al 2 O 3 and kaolinite increased from pH 3 to 4 and decreased from pH 6 to 11, with an adsorption plateau between pH 4 and 6. Effects of change in ionic strength on PO 4 adsorption varied with pH. At low pH, PO 4 adsorption demonstrated a slight decrease with increasing ionic strength, whereas at high pH, PO 4 adsorption increased slightly with increasing ionic strength, resulting in a crossover point where there was no ionic strength effect. The triple‐layer model (TLM) was applied to model the adsorption of SO 4 and PO 4 with both inner and outer sphere complexes using the FITEQL 3.1 computer program. Sulfate adsorption was better modeled by assuming outer sphere complex formation, while PO 4 adsorption was better modeled by assuming inner sphere complex formation.
    Type of Medium: Online Resource
    ISSN: 0361-5995 , 1435-0661
    URL: Article
    DOI: 10.2136/sssaj1997.03615995006100030011x
    RVK:
    RA 4845
    Language: English
    Publisher: Wiley
    Publication Date: 1997
    detail.hit.zdb_id: 241415-6
    detail.hit.zdb_id: 2239747-4
    detail.hit.zdb_id: 196788-5
    detail.hit.zdb_id: 1481691-X
    SSG: 13
    SSG: 21
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  • 6
    Online Resource
    Online Resource
    Hydroxyl-Sulfate Exchange Stoichiometry on γ-Al2O3 and Kaolinite
    Wiley ; 1996
    In:  Soil Science Society of America Journal Vol. 60, No. 2 ( 1996-03), p. 442-452
    Details
    In: Soil Science Society of America Journal, Wiley, Vol. 60, No. 2 ( 1996-03), p. 442-452
    Type of Medium: Online Resource
    ISSN: 0361-5995
    URL: Article
    DOI: 10.2136/sssaj1996.03615995006000020015x
    RVK:
    RA 4845
    Language: English
    Publisher: Wiley
    Publication Date: 1996
    detail.hit.zdb_id: 241415-6
    detail.hit.zdb_id: 2239747-4
    detail.hit.zdb_id: 196788-5
    detail.hit.zdb_id: 1481691-X
    SSG: 13
    SSG: 21
    Location Call Number Limitation Availability
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  • 7
    Online Resource
    Online Resource
    Relating Sodium Percentage to Sodium Adsorption Ratio and its Utility in the Northern Great Plains
    Wiley ; 2015
    In:  Soil Science Society of America Journal Vol. 79, No. 4 ( 2015-07), p. 1261-1264
    Details
    In: Soil Science Society of America Journal, Wiley, Vol. 79, No. 4 ( 2015-07), p. 1261-1264
    Type of Medium: Online Resource
    ISSN: 0361-5995
    URL: Article
    DOI: 10.2136/sssaj2015.01.0010n
    RVK:
    RA 4845
    Language: English
    Publisher: Wiley
    Publication Date: 2015
    detail.hit.zdb_id: 241415-6
    detail.hit.zdb_id: 2239747-4
    detail.hit.zdb_id: 196788-5
    detail.hit.zdb_id: 1481691-X
    SSG: 13
    SSG: 21
    Location Call Number Limitation Availability
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  • 8
    Online Resource
    Online Resource
    Determination of Soluble Phosphorus in the Presence of Organic Ligands or Fluoride
    Wiley ; 1998
    In:  Soil Science Society of America Journal Vol. 62, No. 6 ( 1998-11), p. 1538-1541
    Details
    In: Soil Science Society of America Journal, Wiley, Vol. 62, No. 6 ( 1998-11), p. 1538-1541
    Abstract: In the ascorbic acid‐molybdenum blue method for measurement of soluble P, the relationship between color intensity and P concentration in solution and color stability is greatly affected by organic and inorganic ligands such as oxalate, citrate, tartrate, or F. The objective of this study was to evaluate the effect of these ligands and to optimize the conditions for determination of inorganic P in the presence of the interfering ligand. The critical concentrations of the ligand at which P recovery was significantly decreased were 1.5 m M for oxalate, 3.0 m M for citrate or tartrate, and 10 m M for fluoride. The interference of the ligand with P determination was overcome by excess amounts of ammonium molybdate (AM) added before the color developing reagent (CDR). The critical molybdate/ligand molar ratios (excluding the amount of molybdate added in the CDR) required to completely eliminate the interference of the ligand were 1.12 for oxalate, 0.84 for citrate, 0.56 for fluoride, and 0.34 for tartrate. The presence of ligand and excess amount of AM did not affect the linearity of color intensity against P concentration but did alter the slope, suggesting that the modified method is reliable for P determination in the presence of an interfering ligand provided that the standard curve is prepared in the same matrix as the sample.
    Type of Medium: Online Resource
    ISSN: 0361-5995 , 1435-0661
    URL: Article
    DOI: 10.2136/sssaj1998.03615995006200060009x
    RVK:
    RA 4845
    Language: English
    Publisher: Wiley
    Publication Date: 1998
    detail.hit.zdb_id: 241415-6
    detail.hit.zdb_id: 2239747-4
    detail.hit.zdb_id: 196788-5
    detail.hit.zdb_id: 1481691-X
    SSG: 13
    SSG: 21
    Location Call Number Limitation Availability
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  • 9
    Online Resource
    Online Resource
    Thresholds of Leaf Nitrogen for Optimum Fruit Production and Quality in Grapefruit
    Wiley ; 2003
    In:  Soil Science Society of America Journal Vol. 67, No. 2 ( 2003-03), p. 583-588
    Details
    In: Soil Science Society of America Journal, Wiley, Vol. 67, No. 2 ( 2003-03), p. 583-588
    Abstract: Fertilization is critical for sustainable production of citrus on sandy soils. However, information on nutritional diagnosis standards for grapefruit ( Citrus × paradisi Macfad. ) is lacking and this information is needed for implementation of best management practices (BMPs). A field experiment was conducted from 1997 to 2000 on a Riviera fine sand (loamy, siliceous, hyperthermic, Arenic Glossaqualf) with 30‐yr‐old+ white Marsh grapefruit trees on sour orange ( Citrus a urantium L.) rootstock to evaluate irrigation and fertilization effects on fruit yield and quality and to validate leaf nutrient concentration standards for guiding fertilization of grapefruit. Fertilizers were applied as water soluble granular (WSG, 3 applications yr −1 ), by fertigation (FRT, 15 applications yr −1 ), or as controlled‐release fertilizers (CRF, 1 application yr −1 ) and at five rates (0, 56, 112, 168, or 224 kg N ha −1 yr −1 ) with an N:P:K blend (1.0:0.17:1.02). Fruit yield and quality were not affected by irrigation treatments or fertilizer sources. There was a significantly positive correlation between leaf N concentrations and N rates ( r = 0.98**). Fruit yield was linearly related to N rates or leaf N concentrations. At 90% of maximum yield, leaf N concentrations (dry weight basis) were 22 to 23 g kg −1 Fruit quality parameters such as soluble solid concentration (SSC), juice, and total soluble solids (TSS) were positively correlated with leaf N concentrations, whereas fruit titratable acidity (TA) was negatively related to leaf N concentrations or N rates. The effect of N rate on TA outweighed that on SSC and consequently, the SSC/TA ratio decreased with increasing N rates or leaf N concentration. Fruit size was quadratically related to N rate or leaf N concentration. Overall, fruit sizes and SSC/TA ratios were acceptable for fresh marketing or processing at leaf N concentrations of 22 to 23 g kg −1 Therefore, this leaf N concentration of 22 to 23 g kg −1 can be considered the optimal concentration guideline for fertilization of grapefruit provided that other nutrients are sufficient.
    Type of Medium: Online Resource
    ISSN: 0361-5995 , 1435-0661
    URL: Article
    DOI: 10.2136/sssaj2003.5830
    RVK:
    RA 4845
    Language: English
    Publisher: Wiley
    Publication Date: 2003
    detail.hit.zdb_id: 241415-6
    detail.hit.zdb_id: 2239747-4
    detail.hit.zdb_id: 196788-5
    detail.hit.zdb_id: 1481691-X
    SSG: 13
    SSG: 21
    Location Call Number Limitation Availability
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  • 10
    Online Resource
    Online Resource
    Assessing the effect of land use/land cover change on the change of urban heat island intensity
    Springer Science and Business Media LLC ; 2007
    In:  Theoretical and Applied Climatology Vol. 90, No. 3-4 ( 2007-11), p. 217-226
    Details
    In: Theoretical and Applied Climatology, Springer Science and Business Media LLC, Vol. 90, No. 3-4 ( 2007-11), p. 217-226
    Type of Medium: Online Resource
    ISSN: 0177-798X , 1434-4483
    URL: Article
    DOI: 10.1007/s00704-006-0273-1
    RVK:
    RA 1000
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2007
    detail.hit.zdb_id: 1463177-5
    detail.hit.zdb_id: 405799-5
    SSG: 14
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