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  • 1
    Electronic Resource
    Electronic Resource
    Future directions for agricultural phosphorus research (1995)
    Springer
    Nutrient cycling in agroecosystems 41 (1995), S. 167-178 
    Details
    ISSN: 1573-0867
    Keywords: phosphorus ; workshop ; environment ; review
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A workshop was held in 1990 in Muscle Shoals, Alabama to discuss current and future research on phosphorus in agriculture. Twenty four presentations were given in areas ranging from basic to applied research. For five of the research areas presented at the workshop, this paper presents a literature review, a review of presentations at the workshop, and a discussion of future research ideas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00748306
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of substrate Zn level on distribution of photo-assimilated C14 in maize and bean plants (1971)
    Springer
    Plant and soil 35 (1971), S. 193-196 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Maize and pea bean plants were grown for 2 weeks in Zn-deficient soil fertilized with varying levels of Fe and Zn. The plants were then exposed to C14O2 for 2 minutes and after harvest the ethanolsoluble photosynthate was fractionated into carbohydrates, organic acids, and amino acids. There appeared to be a general increase in the CO2 assimilation rate by maize with increasing rate of Zn; rates were slightly higher with applied Fe, at each Zn level. In contrast to maize, the rate of assimilation by pea beans was unaffected by substrate Zn and was slightly lower with application of Fe, especially in the carbohydrate fraction. Increasing rates of applied Zn had little effect on concentration of Fe and Mn in the maize or pea bean tops. However, application of Fe resulted in a depression in Zn concentration of maize. Despite the relatively high levels of Zn in the tissue of both species, there was no increase in total organic acids assimilated or any indication of gross metabolic imbalances.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01372646
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  • 3
    Electronic Resource
    Electronic Resource
    Efficiency of zinc fertilization for flooded rice (1977)
    Springer
    Plant and soil 48 (1977), S. 673-684 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Several Zn-deficient soils from the major rice growing areas in the USA were characterized with respect to extractable and labile Zn and other parameters including available P, pH, organic matter, and cation exchange capacity. A greenhouse experiment was conducted to determine whether the above factors influence the response of several rice cultivars to ZnSO4 or ZnEDTA applied as a mixed preplant treatment or to the floodwater at panicle initiation. Response of the rice to Zn varied widely among soils with labile Zn (L value) being a poor indicator of Zn availability and soil pH, and DTPA or 2 N MgCl2 extraction of Zn being the most reliable indices. Soil incorporation prior to flooding was more effective than floodwater application for the initial crop, but both methods of placement were comparable for a subsequent ratoon crop. In either situation, ZnSO4 was superior to ZnEDTA. Recovery of Zn from ZnSO4 was generally less than 5 percent where Zn response was obtained and up to 14 percent from nonresponsive soils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00145777
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  • 4
    Electronic Resource
    Electronic Resource
    Zinc uptake by rice, as affected by metabolic inhibitors and competing cations (1974)
    Springer
    Plant and soil 41 (1974), S. 637-646 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Absorption of Zn by 14-day-old intact rice seedlings was studied in short-term uptake experiments. Severe retardation of Zn absorption by various metabolic inhibitors indicated that an active process prevails at Zn concentrations often found in soil solutions. Several cultivars all showed similar sensitivity to the metabolic inhibitor 2,4-dinitrophenol (DPN). At concentrations of 10−4 M, both FeCl2 and MnCl2 depressed Zn uptake in roots and translocation to shoots; uptake was depressed to a lesser extent with Ca. Although Mg reduced uptake by the roots, translocation to the shoots was enhanced. These results suggest that high solution concentrations of reduced Fe and Mn which develop in paddy culture may be related to Zn nutrition. This information could assist in predicting Zn deficiency and may explain correction of Zn deficiency by draining flooded rice fields.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02185822
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  • 5
    Electronic Resource
    Electronic Resource
    Soil temperature and nitrogen effects on response of flooded and nonflooded rice to zinc (1979)
    Springer
    Plant and soil 52 (1979), S. 365-372 
    Details
    ISSN: 1573-5036
    Keywords: Ammonium sulphate ; Crowley soil ; Fixation ; Flooding ; Mixed application ; Rice ; Surface application ; Urea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Response of direct seeded rice (cv. Bluebelle) to Zn was studied in flooded and nonflooded (field capacity) Crowley soil (pH 7.6) maintained at soil temperatures of 18 and 30°C. Urea and (NH4)2SO4 were compared as sources of N to determine their effect on plant uptake of Zn from ZnSO4 either mixed or surface applied to the soil. Grain yields were slightly higher from nonflooded than from flooded soil. Higher dry matter production at 30 than at 18°C was not related to Zn nutrition. Urea and (NH4)2SO4 resulted in similar yields and Zn uptake by flooded rice, but (NH4)2SO4 was superior for nonflooded rice in the absence of applied Zn. More fixation of mixed Zn by the limed Crowley soil probably caused its lower effectiveness, as compared to surface-applied Zn.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02185579
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  • 6
    Electronic Resource
    Electronic Resource
    C14 distribution in photosynthate of tomato as influenced by substrate copper and molybdenum level and nitrogen source (1966)
    Springer
    Plant and soil 24 (1966), S. 437-446 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The influence of nitrogen source and micronutrient treatment on the apportionment of C14 in alcohol extracts was studied in tomato. Plants were exposed at several stages of maturity to C14O2 and the ethanol-soluble photosynthate fractionated into sugars, organic acids, and amino acids. Ammonium-treated plants had low levels of organic acids at all stages of maturity, suggesting a rapid conversion to amino acid residues. However, the addition of copper in the absence of molybdenum resulted in increased labelling of the organic acid fraction under nitrate nutrition. The amino acid fraction was reduced at some stages of growth under these conditions. This may indicate that copper interferes with the role of molybdenum in the enzymatic reduction of nitrate. Measurement of the total quantity of some individual free amino acids indicated more efficient utilization of these for protein synthesis in the presence of copper. On the other hand, assay of the C14-activity of individual free amino acids showed that degree of label bore little relation to micro-nutrient treatment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01374050
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  • 7
    Electronic Resource
    Electronic Resource
    Uptake of molybdenum at two pH levels as influenced by anaerobiosis (1966)
    Springer
    Plant and soil 25 (1966), S. 467-470 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The influence of anaerobiosis and pH level of the nutrient medium has been studied with respect to Mo-uptake by corn and tomato plants. Data presented suggest that species differences may alter penetration and transport of Mo. Practical significance is attached to the fact that high nutrient levels in root systems do not necessarily indicate the status in the shoots. Conversely, analysis of shoot tissue can be misleading in assessing total Mo (and possibly other ions) removal under certain cultural environments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01394471
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of substrate Zn level on distribution of photo-assimilated C14 in maize and bean plants (1971)
    Springer
    Plant and soil 35 (1971), S. 193-196 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Maize and pea bean plants were grown for 2 weeks in Zn-deficient soil fertilized with varying levels of Fe and Zn. The plants were then exposed to C14O2 for 2 minutes and after harvest the ethanolsoluble photosynthate was fractionated into carbohydrates, organic acids, and amino acids. There appeared to be a general increase in the CO2 assimilation rate by maize with increasing rate of Zn; rates were slightly higher with applied Fe, at each Zn level. In contrast to maize, the rate of assimilation by pea beans was unaffected by substrate Zn and was slightly lower with application of Fe, especially in the carbohydrate fraction. Increasing rates of applied Zn had little effect on concentration of Fe and Mn in the maize or pea bean tops. However, application of Fe resulted in a depression in Zn concentration of maize. Despite the relatively high levels of Zn in the tissue of both species, there was no increase in total organic acids assimilated or any indication of gross metabolic imbalances.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01372646
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  • 9
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    Response of Several Rice Cultivars to Zn 1 (1974)
    Wiley
    Details
    Publication Date: 1974-03-01
    Print ISSN: 0002-1962
    Electronic ISSN: 1435-0645
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Wiley
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  • 10
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    Release of Nitrogen from Sulfur‐coated Urea in Flooded Soil 1 (1970)
    Wiley
    Details
    Publication Date: 1970-09-01
    Print ISSN: 0002-1962
    Electronic ISSN: 1435-0645
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Wiley
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