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  • 1
    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
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  • 2
    Online Resource
    Online Resource
    Nitrogen and Water Distributions in Fertilized Sandy Soil During Irrigation and Drainage
    Wiley ; 1980
    In:  Soil Science Society of America Journal Vol. 44, No. 1 ( 1980-01), p. 95-102
    Details
    In: Soil Science Society of America Journal, Wiley, Vol. 44, No. 1 ( 1980-01), p. 95-102
    Type of Medium: Online Resource
    ISSN: 0361-5995
    URL: Article
    DOI: 10.2136/sssaj1980.03615995004400010021x
    RVK:
    RA 4845
    Language: English
    Publisher: Wiley
    Publication Date: 1980
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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
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  • 3
    Online Resource
    Online Resource
    Millennial-scale variations in hydrography and biogeochemistry in the Eastern Equatorial Pacific over the last 100 kyr
    Elsevier BV ; 2011
    In:  Quaternary Science Reviews Vol. 30, No. 1-2 ( 2011-01), p. 210-223
    Details
    In: Quaternary Science Reviews, Elsevier BV, Vol. 30, No. 1-2 ( 2011-01), p. 210-223
    Type of Medium: Online Resource
    ISSN: 0277-3791
    URL: Article
    DOI: 10.1016/j.quascirev.2010.10.012
    RVK:
    RA 1000
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2011
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    detail.hit.zdb_id: 1495523-4
    SSG: 14
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  • 4
    Online Resource
    Online Resource
    Fertilizer Source and Soil Aeration Effects on Runoff Volume and Quality
    Wiley ; 2006
    In:  Soil Science Society of America Journal Vol. 70, No. 1 ( 2006-01), p. 84-89
    Details
    In: Soil Science Society of America Journal, Wiley, Vol. 70, No. 1 ( 2006-01), p. 84-89
    Abstract: Minimizing runoff losses from grasslands may benefit the producer and abate potential eutrophication of aquatic systems. This study was conducted to evaluate the effects of fertilizer source and soil aeration on the volume and quality of runoff from grassed plots. Sixteen tall fescue [ Festuca arundinacea Schreb.]–bermudagrass [ Cynodon dactylon L.] plots were established on Altavista sandy‐loam soil (fine‐loamy, mixed, semiactive, thermic Aquic Hapludults) in Georgia, USA. Two fertilizer sources (inorganic fertilizer [IF] and broiler litter [BL]) and two aeration treatments (aerated and nonaerated) were factorially combined to generate four experimental treatments. Broiler litter was applied at 1765 kg dry matter ha −1 and IF was applied to match nutrient rates applied with BL (36 kg available N ha −1 , 39 kg P ha −1 , 60 kg K ha −1 ). Simulated rainfall was applied immediately after fertilizer application and 1 mo later. Runoff samples were analyzed for dissolved reactive phosphorus (DRP), total Kjeldahl phosphorus (TKP), and ammonium (NH 4 –N). In the first runoff event, plots fertilized with IF lost more TKP than plots fertilized with BL (3.4 vs. 1.1 kg P ha −1 ). In contrast, plots fertilized with BL lost more NH 4 –N than plots fertilized with IF (1.4 vs. 0.6 kg N ha −1 ). These results support the use of different weighting factors for BL and IF when assessing their potential for contaminating surface runoff. Aeration numerically reduced runoff volume by 27%, though not significantly, in the first runoff event ( P = 0.16), but did not affect runoff volume 1 mo later. Aeration did not affect the mass losses of DRP, TKN, and NH 4 –N. These results indicate that aeration of hayed grasslands on these soils would not be expected to significantly affect the volume and quality of surface runoff.
    Type of Medium: Online Resource
    ISSN: 0361-5995 , 1435-0661
    URL: Article
    DOI: 10.2136/sssaj2003.0114
    RVK:
    RA 4845
    Language: English
    Publisher: Wiley
    Publication Date: 2006
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    detail.hit.zdb_id: 196788-5
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    SSG: 13
    SSG: 21
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  • 5
    Online Resource
    Online Resource
    Phosphorus and Heavy Metal Attachment and Release in Sandy Soil Aggregate Fractions
    Wiley ; 2003
    In:  Soil Science Society of America Journal Vol. 67, No. 4 ( 2003-07), p. 1158-1167
    Details
    In: Soil Science Society of America Journal, Wiley, Vol. 67, No. 4 ( 2003-07), p. 1158-1167
    Type of Medium: Online Resource
    ISSN: 0361-5995
    URL: Article
    DOI: 10.2136/sssaj2003.1158
    RVK:
    RA 4845
    Language: English
    Publisher: Wiley
    Publication Date: 2003
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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
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  • 6
    Online Resource
    Online Resource
    The Effect of Exchangeable Calcium on the Retention of Phosphorus by Clay Fractions of Soils of the Memphis Catena
    Wiley ; 1960
    In:  Soil Science Society of America Journal Vol. 24, No. 5 ( 1960-09), p. 333-336
    Details
    In: Soil Science Society of America Journal, Wiley, Vol. 24, No. 5 ( 1960-09), p. 333-336
    Abstract: The effect of Ca saturation on P‐retaining properties of clay fractions of five Kentucky soils of the Memphis catena was studied. Changes in P retention and pH which occurred during storage of acid‐washed clays were investigated. Retained P was considered to be that portion of added P removed by the clay separate from a water solution. A definite change occurred in the P‐retaining properties of initially acid‐washed clay separates during storage as evidenced by the decrease in P and P 32 remaining in solution and the increase in pH. This change was attributed to an increase in A1 saturation of the exchange complex. With freshly acid‐washed clay separates of all soils of the catena, P retention generally increased with increased Ca saturation, whereas P retention for clays aged after acid‐washing generally decreased as Ca saturation increased. It is suggested that in considering H, Ca and Al as exchangeable cations, P in solution decreases in the order given. Retention of added P by Memphis soil was about equal to the retention of added P by an aged Memphis clay separate.
    Type of Medium: Online Resource
    ISSN: 0361-5995 , 1435-0661
    URL: Article
    DOI: 10.2136/sssaj1960.03615995002400050010x
    RVK:
    RA 4845
    Language: English
    Publisher: Wiley
    Publication Date: 1960
    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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  • 7
    Online Resource
    Online Resource
    Transport of Heavy Metals in Surface Runoff from Vegetable and Citrus Fields
    Wiley ; 2004
    In:  Soil Science Society of America Journal Vol. 68, No. 5 ( 2004-09), p. 1662-1669
    Details
    In: Soil Science Society of America Journal, Wiley, Vol. 68, No. 5 ( 2004-09), p. 1662-1669
    Abstract: Heavy metal accumulation in agricultural soils increases export potential of the metals to the environment. The concentrations of dissolved heavy metals (Cd, Co, Cr, Cu, Fe, Ni, Pb, Zn, Mn, and Mo) in surface runoff were monitored over a 2‐yr period at 11 sites of vegetable farms and citrus groves in Florida. A total of 1277 surface runoff samples were analyzed for dissolved metals and extractable metals in the surface soils of each field site were determined. Concentrations of the metals in the runoff ranged widely from nondetectable level to 2.80, 18.5, 14.1, 1475, 9227, 39.3, 30.4, 1401, 2118, and 15.0 μg L −1 for Cd, Co, Cr, Cu, Fe, Ni, Pb, Zn, Mn, and Mo, respectively. Spatial and temporal variations in the concentrations of heavy metals and runoff discharge were noted among the different sites. Ninety‐four, 96, 55, 32, 93, and 61% of the samples had metal concentrations below the detection limits for Cd, Co, Cr, Ni, Pb, and Mo, respectively, whereas 0.62, 30, and 23% of the samples had Cu, Fe, and Mn higher than their drinking water standards. Annual loads of dissolved metals in the runoff varied widely among monitoring sites and were different between the year 2001 and 2002. The concentrations of heavy metals in the surface runoff were associated with the accumulation of the metals in the soils. The 0.01 M CaCl 2 extractable Cu, Fe, Zn, and Mn in soil were found to significantly correlate with Cu, Fe, Zn, and Mn concentrations in the surface runoff.
    Type of Medium: Online Resource
    ISSN: 0361-5995 , 1435-0661
    URL: Article
    DOI: 10.2136/sssaj2004.1662
    RVK:
    RA 4845
    Language: English
    Publisher: Wiley
    Publication Date: 2004
    detail.hit.zdb_id: 241415-6
    detail.hit.zdb_id: 2239747-4
    detail.hit.zdb_id: 196788-5
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    SSG: 13
    SSG: 21
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  • 8
    Online Resource
    Online Resource
    Chemical Properties of Acid‐Sulfate Soils Recently Reclaimed from Florida Marshland
    Wiley ; 1973
    In:  Soil Science Society of America Journal Vol. 37, No. 3 ( 1973-05), p. 367-371
    Details
    In: Soil Science Society of America Journal, Wiley, Vol. 37, No. 3 ( 1973-05), p. 367-371
    Abstract: Acid soil layers, with pH as low as 3.0, were found in the subsurface horizons of soils derived from marine sediments and have been recently developed into citrus groves. Soil layers with acidity varying from pH 3.0 to 7.7 and sulfate content from 0.5 to 39.0 meq/100 g of soil were compared for their capability of producing acid‐sulfates. Lime requirements of selected acid layers were found to be as high as 4.5 meq of CaCO 3 equivalent per 100 g of soil. The acid‐sulfate potential (oxidation of reduced sulfur to H 2 SO 4 ) accounts for the reduction of pH of the reclaimed soils. The sulfate content of soil layers was often in excess of 2,000 ppm when the soil pH after oxidation with H 2 O 2 was below 3.0 and was dependent on oxidizable sulfur content of the sample and buffering capacity of the soil. Oxidized soil layers with pH values below 3.5 released soluble Al and Fe up to 275 ppm and 100 ppm, respectively.
    Type of Medium: Online Resource
    ISSN: 0361-5995 , 1435-0661
    URL: Article
    DOI: 10.2136/sssaj1973.03615995003700030017x
    RVK:
    RA 4845
    Language: English
    Publisher: Wiley
    Publication Date: 1973
    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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  • 9
    Online Resource
    Online Resource
    Fractionation of Iron, Managanese, Aluminum, and Phosphorus in Selected Sandy Soils under Citrus Production
    Wiley ; 1997
    In:  Soil Science Society of America Journal Vol. 61, No. 3 ( 1997-05), p. 794-801
    Details
    In: Soil Science Society of America Journal, Wiley, Vol. 61, No. 3 ( 1997-05), p. 794-801
    Abstract: The sorption and downward transport of trace metals and phosphate in soils are dependent, in part, on the distribution of various forms of Fe, Al, and Mn. The objectives of this study were to investigate (i) the distribution of various forms (exchangeable, organically bound, associated with Mn oxide, amorphous, and associated with crystalline Fe oxide forms) of Fe, Mn, Al, and P in the surface horizons, and (ii) the distribution of these elements in different depth horizons in six soil series in Florida representing Spodosols, Alfisols, and Entisols. Variation in concentration of total Fe with depth of soil was significantly correlated with clay content. Greater than 60 and 80% of total Fe was present in the amorphous and crystalline Fe oxide forms in soils with pH ≤ 6.5 and pH 〉 6.5, respectively. Total concentration of Mn was lower than that of Fe or Al in all the soils, and it changed very little with depth of sampling. Manganese in the surface horizon was present predominantly as the organically bound form in the Spodosols and as organically bound, oxide, and amorphous forms in the Alfisols and Entisols. The distribution of total and oxalate‐extractable P was significantly related to the content of amorphous Al and Fe and crystalline Fe oxides in the soils. The distribution of various forms of the metals and P was significantly influenced by the soil pH and organic matter content. In the surface horizon soils, Mn and Al were present predominantly as organically bound forms at pH 〈 6.5 or as Mn oxide and amorphous associated forms at pH 〉 6.5.
    Type of Medium: Online Resource
    ISSN: 0361-5995 , 1435-0661
    URL: Article
    DOI: 10.2136/sssaj1997.03615995006100030012x
    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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  • 10
    Online Resource
    Online Resource
    A Method for Detecting and Estimating Hydrogen Sulfide in Flooded Soil
    Wiley ; 1969
    In:  Soil Science Society of America Journal Vol. 33, No. 5 ( 1969-09), p. 816-817
    Details
    In: Soil Science Society of America Journal, Wiley, Vol. 33, No. 5 ( 1969-09), p. 816-817
    Abstract: A 60‐ml sorption cell utilizing 0.5 mil PVC membranes permeable to H 2 S is described. NaOH is used as the sorbing solution. The cell is capable of detecting H 2 S in soil zones containing 〈 0.1 ppm in groundwater over short and prolonged periods of anaerobic flooding under conditions of a fluctuating water table.
    Type of Medium: Online Resource
    ISSN: 0361-5995 , 1435-0661
    URL: Article
    DOI: 10.2136/sssaj1969.03615995003300050053x
    RVK:
    RA 4845
    Language: English
    Publisher: Wiley
    Publication Date: 1969
    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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