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  • 1
    Electronic Resource
    Electronic Resource
    An evaluation of plant-available soil nitrogen in selected sandy soils by electro-ultrafiltration, KCl, and CaCl2 extraction methods (2000)
    Springer
    Biology and fertility of soils 30 (2000), S. 328-332 
    Details
    ISSN: 1432-0789
    Keywords: Key words Nitrate-N ; Ammonium-N ; Organic bound N ; N-extraction methods
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  Improving the precision in estimating the nitrogen (N) requirement for citrus trees on sandy soils is important for increasing N efficiency by the trees and minimizing potential losses of N in commercial citrus production areas. In this study, representative Florida soils were sampled from major citrus production areas and the electro-ultrafiltration (EUF) technique was used to measure the concentrations of total EUF-extractable nitrogen (EUF-Nt), ammonium-N (EUF-NH4 +–N) and nitrate-N (EUF-NO3 ––N). Available organic N (Norg) was calculated as: EUF-Nt–(NH4 +–N+NO3 ––N). The N concentrations in the EUF extraction were greater than those by the KCl or CaCl2 method. The Norg fraction, estimated by the EUF method, varied from 4.4 to 40.8 mg kg–1 soil, equivalent to 10 to 91 kg N ha–1 (for the top 15 cm depth soil) and was positively correlated with the total soil N determined by the Kjeldahl method. The presence of appreciable amounts of Norg in these soils indicates that these soils contain high proportions of the total soil N in easily mineralizable Norg forms. This study demonstrates that the EUF-extractable organic bound N must be considered in developing N fertilizer recommendations for citrus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003740050011
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of Monitor Well Purging Technique on Selected Chemical Properties of Surficial Groundwater (1998)
    Springer
    Bulletin of environmental contamination and toxicology 60 (1998), S. 525-530 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001289900657
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  • 3
    Electronic Resource
    Electronic Resource
    Distribution of rainfall and soil moisture content in the soil profile under citrus tree canopy and at the dripline (1999)
    Springer
    Irrigation science 18 (1999), S. 109-115 
    Details
    ISSN: 1432-1319
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The plant canopy intercepts rain and thus can alter the distribution of water under the canopy as compared to that along the dripline. The effects of a citrus (Citrus sinensis L. Osbeck) tree (25-year-old, Valencia orange) canopy on the distribution of rainfall and soil moisture content within the soil profile either along the dripline (D) or under the canopy near the trunk (inner side; I), and midway between I and Dripline (M) were evaluated, on the east and west sides of trees planted along north-south rows. Results of eleven storm events in 1995 (mean of east and west sides) revealed that the amounts of precipitation at the D, M, and I positions were 97–140, 47–94, and 52–79% of the incident rainfall, respectively. Thus, canopy interception of incident rainfall was quite appreciable. The soil moisture content was greater along the dripline compared to that at the M and I positions, particularly in the deeper (≥60 cm) soil profile. The water flux was significantly greater at the dripline than under the canopy indicating a greater leaching potential of soil-applied fertilizers and other chemicals when placed along the dripline. A substantial reduction in the rainfall and water flux under the canopy as a result of canopy interception suggests that application of fertilizer and chemicals under the canopy could minimize leaching losses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002710050051
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  • 4
    Electronic Resource
    Electronic Resource
    Nitrogen uptake and growth of two citrus rootstock seedlings in a sandy soil receiving different controlled-release fertilizer sources (1998)
    Springer
    Biology and fertility of soils 26 (1998), S. 169-172 
    Details
    ISSN: 1432-0789
    Keywords: Key words Urea ; Coated fertilizers ; Ammonium ; nitrogen ; Nitrate nitrogen ; Nitrogen uptake
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Understanding the fate of different forms of nitrogen (N) fertilizers applied to soils is an important step in enhancing N use efficiency and minimizing N losses. The growth and N uptake of two citrus rootstocks, Swingle citrumelo (SC), and Cleopatra mandarin (CM), seedlings were evaluated in a pot experiment using a Candler fine sand (hyperthermic, uncoated, Typic Quartzipsamments) without N application or with 400 mg N kg–1 applied as urea or controlled-release fertilizers (CRF; either as Meister, Osmocote, or Poly-S). Meister and Osmocote are polyolefin resin-coated urea with longevity of N release for 270 days (at 25°C). Poly-S is a polymer and sulfur-coated urea with release duration considerably shorter than that of either Meister or Osmocote. The concentrations of 2 M KCl extractable nitrate nitrogen (NO3 –-N) and ammonium nitrogen (NH4 +-N) in the soil sampled 180 days and 300 days after planting were greater in the soil with SC than with CM rootstock seedlings. In most cases, the extractable NH4 + and NO3 – concentrations were greater for the Osmocote treatment compared to the other N sources. For the SC rootstock seedlings, dry weight was greater with Meister or Poly-S compared with either Osmocote or urea. At the end of the experiment, ranking of the various N sources, with respect to total N uptake by the seedlings, was: Meister = Osmocote 〉 Poly-S 〉 Urea 〉 no N for CM rootstock, and Meister = Poly-S = Osmocote 〉 Urea 〉 no N for SC rootstock. The study demonstrated that for a given rate of N application the total N uptake by seedlings was greater for the CRF compared to urea treatment. This suggests that various N losses were lower from the CRF source as compared to those from soluble fertilizers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003740050363
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  • 5
    Electronic Resource
    Electronic Resource
    Transport of heavy metals and cations in a fly ash amended soil (1995)
    Springer
    Bulletin of environmental contamination and toxicology 55 (1995), S. 502-509 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00196028
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  • 6
    Electronic Resource
    Electronic Resource
    Sorption of bromacil, diuron, norflurazon, and simazine at various horizons in two soils (1990)
    Springer
    Bulletin of environmental contamination and toxicology 45 (1990), S. 365-374 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01701159
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  • 7
    Electronic Resource
    Electronic Resource
    Copper contamination of sandy soils and effects on young Hamlin orange trees (1993)
    Springer
    Bulletin of environmental contamination and toxicology 51 (1993), S. 857-864 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00198282
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  • 8
    Electronic Resource
    Electronic Resource
    Influence of fungal-soil water interactions on phytophthora root rot of alfalfa (1985)
    Springer
    Biology and fertility of soils 1 (1985), S. 91-96 
    Details
    ISSN: 1432-0789
    Keywords: Phytophthora megasperma ; Alfalfa ; Moisture regime ; Root rot
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Phytophthora root rot of alfalfa (Medicago sativa L.) is a serious problem in wet soils. This disease is caused by Phytophthora megasperma f. sp. medicaginis. The influence of soil-water interactions with P. megasperma f. sp. medicaginis and other factors on the severity of phytophthora root rot of mature alfalfa plants (10–12 weeks) was studied in greenhouse experiments. Severe and reproducible root rot was produced by subsurface (3–4 cm) placement of mycelial suspension. Soil saturation 3 days prior to inoculation followed by alternating 3-day wet (soil saturation) and 4-day dry (surface watering once a day) moisture regimes (for 30–40 days following inoculation) resulted in severe root damage. The severity of root rot was greater when the inoculation was done at an ambient temperature of 20°C than at 15°C. Water quality (tap water or deionized distilled water) had no effect on severity of infection. The isolates PT 78-3 (Minnesota) and TN-2 (Maryland) were equally effective in terms of severity of damage. The impact of excess soil water stress (described above) alone on the shoot and root dry weight as well as on shoot symptoms was similar to that of root rot stress. However, root symptoms showed a marked difference. A close examination of root symptoms is highly recommended to differentiate clearly the plant injury due to root rot from that due to excess soil water stress.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00255135
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  • 9
    Electronic Resource
    Electronic Resource
    Amelioration of acid soil infertility by phosphogypsum (1990)
    Springer
    Plant and soil 128 (1990), S. 127-134 
    Details
    ISSN: 1573-5036
    Keywords: Al toxicity ; Ca deficiency ; displaced soil solution ; Glycine max L. ; Medicago sativa L. ; self-liming effect ; subsoil acidity ; sulfate-induced surface charging ; variable charge soils
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Amelioration of subsoil acidity requires an increase in Ca status along with a decrease in Al status in subsoil. In this study, effects of phosphogypsum (PG) on the amelioration of subsoil acidity have been evaluated, using cultivated and woodland subsoils representing Cecil, Wedowee (both Typic Hapludult) and Bladen (Typic Albaquult) series. Subsoil (0.6–0.8 m) samples were collected and treated with either PG (approximately 2 Mg ha-1 rate), Ca(NO3)2 or Mg(NO3)2 along with an unamended control treatment. A fertile topsoil amended with NH4NO3 was placed on top of all treated subsoil. Top and root growth of alfalfa [Medicago sativa (L.) cv. Hunter River] and soybean [Glycine max (L.) Merr. cv. Lee] were significantly greater in PG-amended than in unamended pots of the Cecil and Wedowee soils, although most growth was observed with the Ca(NO3)2-amended treatment. In the Bladen soil, however, none of the amendments evoked a significant growth response in either alfalfa or soybean. The concentration of Ca in the displaced soil solution (in soils with no plants) as well as tissue levels of Ca suggest that the growth response was partly due to an improved Ca availability in both PG or Ca(NO3)2-treated soils. Exchangeable Al decreased in PG-amended soils. The self-liming effect of PG, which is a release of OH- due to ligand exchange between SO4 2- and OH-, as well as a decrease in exchangeable Al in PG-amended soil is greater in predominantly kaolinitic Cecil and Wedowee soils than in smectitic Bladen soil. As a result, significant growth response to PG amendment was observed in the Cecil and Wedowee soils, but not in the Bladen soil.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00011101
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  • 10
    Electronic Resource
    Electronic Resource
    The influence of rhizosphere in rice crop on resin-extractable phosphate in flooded soils at various levels of phosphate applications (1980)
    Springer
    Plant and soil 56 (1980), S. 17-25 
    Details
    ISSN: 1573-5036
    Keywords: Brackish water alluvial soil ; Crop-induced phosphate mobilization ; Flooded soils ; Immobilization ; Resin extractable phosphate ; Rhizosphere ; Rice ; Sandy loam soil
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Poor or lack of response of lowland rice to P fertilization is a well-known fact. Several studies were conducted in this direction however, our understanding regarding the underlying mechanism has been far from clear. A remarkable influence of rice plants on P transformation in submerged soil is identified in this experiment which may shed light on this problem. Accordingly, in presence of rice plants P was mobilized during the initial growing period followed by immobilization. The increased microbial activity in presence of physiologically active roots was responsible for P mobilization, while capacity of rice plants to reoxidize the rhizosphere, by secretion of oxygen from roots, during later growing period was responsible for P immobilization. The extent of P mobilization decreased while that of immobilization increased with increasing P levels in different soils. At a given P level the ratio of P mobilization to immobilization was higher in a soil where crop growth was better and P uptake was higher as compared to another soil where crop growth was poor with lower P uptake. Thus, lowland rice plants appear to possess an unique physiological mechanism, to regulate the contrasting changes in P availability in the rhizosphere depending on P requirement by the plants or P availability in soil, which in turn is responsible for the poor or lack of response to P fertilization. The experiment was conducted in a growth chamber. Two soils with widely varying properties were used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02197948
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