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  • Articles  (17)
  • Acetylene reduction  (11)
  • Potassium
  • 1980-1984  (17)
  • 1981  (17)
  • Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition  (17)
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  • Articles  (17)
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  • 1980-1984  (17)
Year
Topic
  • Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition  (17)
  • Biology  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Effect of phosphorus and potassium deficiency on keto acid and amino acid content of peanut (Arachis hypogaea L.) leaves (1981)
    Springer
    Plant and soil 59 (1981), S. 159-162 
    Details
    ISSN: 1573-5036
    Keywords: Amino acid ; Deficiency ; Keto acid ; Peanut ; Phosphorus ; Potassium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Lack of both phosphorus and potassuium results in accumulation of all the keto acids and amino acids in 30 days and 20 days old peanut leaves respectively. This is due to te sluggish metabolism of the tissue under P and K deficienty. Decrease of all the keto acids in 20 days old plants suggests that their synthesis might be affecte under P and K deficiency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02183603
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  • 2
    Electronic Resource
    Electronic Resource
    Nodulation and N2 fixation byInga jinicuil, a woody legume in coffee plantations (1981)
    Springer
    Plant and soil 59 (1981), S. 207-215 
    Details
    ISSN: 1573-5036
    Keywords: Acetylene reduction ; Coffee plantation ; Inga jinicuil ; Nodulation ; Nutrients ; Woody legume
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The effect of soil nutrients on nodulation byInga jinicuil, a leguminous tree used for shade in Mexican coffee plantations, is discussed. Nodulation and C2H2 reduction ofI. jinicuil seedlings, grown in soil, taken at different distances from coffee trunks, is described. Nodule biomass and activity are compared to the nutrient content of soils within various distances of coffee trunks. Seven coffee plantations, that employI. jinicuil for shade, were examined with respect to nodule biomass, C2H2 reducing activity, and soil characteristics. Highest nodule biomass was observed in soils with high levels of available phosphorus. High nitrogen content of the soil, on the other hand, appeared to be correlated with low nodule biomass. Potassium and magnesium, while apparently having little effect on nodule biomass, seem to be positively correlated with C2H2 reduction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02184194
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  • 3
    Electronic Resource
    Electronic Resource
    Alfalfa,Medicago sativa L., in highly weathered, acid soils (1981)
    Springer
    Plant and soil 59 (1981), S. 455-463 
    Details
    ISSN: 1573-5036
    Keywords: Acetylene reduction ; Acid soil ; Al uptake ; Liming ; N uptake ; Nodulation ; P application ; Plant persistence ; Root dry weight ; Seed germination ; Shoot dry weight
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The effect of lime and P application on yield (top and root weigh), nodulation, intervally collected acetylene reduction (N2-fixation), and N and Al uptake of young alfalfa (46 days growth) were investigated in greenhouse pots containing acid Bladen or Bradson topsoils. The effect on seed germination and seedling persistence under these greenhouse conditions was also recorded. Alfalfa yield and acetylene reduction increased with lime and P additions in both soils, but, predominately, with P. There was no advantage of increasing these two parameters with liming past pH 6.0 provided P was adequate. Positive relationships (R2) existed between yield and acetylene reduction, and with both factors and root weight, nodule weight, and N uptake. Increased uptake of Al by alfalfa seedlings depressed yield, but data indicate P may block Al uptake at high soil pH. There were no treatment effects on seed germination, but P application increased plant persistence in the Bladen soil.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02184549
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  • 4
    Electronic Resource
    Electronic Resource
    Nodulation and N2-fixation byInga jinicuil, a woody legume in coffee plantations (1981)
    Springer
    Plant and soil 59 (1981), S. 201-206 
    Details
    ISSN: 1573-5036
    Keywords: Acetylene reduction ; Coffee plantation ; Inga jinicuil ; Nitrogen fixation ; Nodule biomass ; Woody legume
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Nodule biomass and yearly C2H2 reduction rates are reported forInga jinicuil, a leguminous tree used for shade in Mexican coffee plantations. Annual fixation by this species approximates 35 kg ha−1; which, when compared to nitrogen additions from fertilizers, represents an important nitrogen input to the coffee ecosystem.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02184193
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  • 5
    Electronic Resource
    Electronic Resource
    Growth and nitrogen fixation ofAeschynomene under water stressed conditions (1981)
    Springer
    Plant and soil 60 (1981), S. 309-315 
    Details
    ISSN: 1573-5036
    Keywords: Acetylene reduction ; Aeschynomene americana ; Flooding ; Leaf water potential ; Nitrogen fixation ; Soil moisture deficits
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Studies on the tolerance ofAeschynomene americana L. to periods of flooding or soil moisture deficit were conducted in an attempt to elucidate nitrogen fixation as affected by soil moisture. Nitrogenase activity was not reduced significantly in pot-grown Aeschynomene plants subjected to flooding in greenhouse conditions. After 20 days of withholding water from the soil, nitrogenase activities of the drought-stressed plants were much lower than those of either the well-watered or flooded plants. Leaf water potentials were similar in flooded and control plants; however, the droughted plants had leaf water potentials that were 4 bars lower than those of the control plants. Aeschynomene plants were tolerant to long-term periods of flooding, but exhibited a reduction in nitrogenase activity and leaf water status when subjected to soil moisture deficits.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02374115
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  • 6
    Electronic Resource
    Electronic Resource
    Balance sheet of soil phosphorus and potassium as influenced by intensive cropping and fertilizer use (1981)
    Springer
    Plant and soil 60 (1981), S. 187-193 
    Details
    ISSN: 1573-5036
    Keywords: Fertilizer ; Intensive cropping ; Lime ; Multiple cropping ; Manure ; Nutrient removal ; Nitrogen ; Phosphorus ; Potassium ; Weedicide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The balance sheet of phosphorus and potassium were worked out from a long term manure and fertilizer experiment conducted for eight years and is still continuing at Ranchi Agricultural College, Kanke, Ranchi, India. Increasing levels of fertilizer combination with organic manure and lime give the highest yield as well as removed the highest amount of phosphorus and potassium from the soil and gave the positive gain of soil phosphorus and potassium in intensive cropping. The highest gains of 59.0 and 278.0 kg/ha of phosphorus and potassium respectively were recorded in 150% NPK application.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02374103
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  • 7
    Electronic Resource
    Electronic Resource
    Alfalffa,Medicago sativa L., in highly weathered, acid soils (1981)
    Springer
    Plant and soil 60 (1981), S. 205-211 
    Details
    ISSN: 1573-5036
    Keywords: Acetylene reduction ; Acid soil ; K application ; Liming ; N2-fixation ; Nodulation ; P application ; Rhizobium meliloti ; Root dry weight ; Shoot dry weight
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Alfalfa plants,Medicago sativa L., were selected from the Florida 66 cultivar for vigor in an acid (pH 4.4, Al≥.4 meq/100 g) and a limed, fertilized (pH 6.5, Al=0 meq/100 g, P and K added) Cecil topsoil. The selected plants were intermated by selection condition to achieve two germplasms, acid selected (A-1) and limed, fertile selected (L-1). ARhizobium meliloti strain (79-4s) was isolated from a high acetylene reducing nodule from a plant in a similar acid soil. The germplasms and the Rhizobium strain were then tested in greenhouse pots for agronomic performance under a variety of soil pH and fertility conditions. The 79-4s inoculum, as well as commercially prepared inoculum, gave better plant yield and acetylene reduction (N2-fixation) at all harvests when compared to a sterile peat control, but the commercial inoculum was the best inoculum treatment. The A-1 germplasm produced higher shoot dry weight at the final harvest than did the L-1 germplasm at all soil pH’s when P and K were applied at the highest rates. The A-1 germplasm also had better root weight (mainly fibrous roots) and acetylene reduction in these soil conditions. The two germplasms appear to be genetically distinct and respond differently depending on soil pH and fertility conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02374105
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  • 8
    Electronic Resource
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    Pigment distribution and nitrogen fixation inAnabaena azollae (1981)
    Springer
    Plant and soil 61 (1981), S. 203-226 
    Details
    ISSN: 1573-5036
    Keywords: Acetylene reduction ; Azolla spp. ; Chemography ; Heterocyst frequency ; Leaf age ; N2-fixation gradients ; Pigment composition ; Symbiont age ; Symbiont chlorophyll phycocyanin ; Symbiont cyanobacteriumAnabaena azollae ; Tetrazolium salts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The symbiotic heterocystous cyanobacteriumAnabaena azollae present in the leaf cavities of the water fernAzolla spp. was studied. The cyanobacteria extracted from the leaf cavities showed differences in pigment composition in three species ofAzolla, i.e A.pinnata var.pinnata, A.caroliniana and A.filiculoides, as observed by pigment absorption and epifluorescence tests. These differences suggest that of these species the cyanobiont ofA. pinnata is the most actively nitrogenfixing form. This has been confirmed by nitrogen fixation (acetylene reduction) tests. Heterocysts of the symbiont ofA. pinnata were characterized by high chlorophylla and low phycocyanin content, a low fluorescence yield of chlorophyll in the heterocysts compared to vegetative cells and a gradient of phycocyanin concentration in the vegetative cells adjacent to heterocysts. This indicates that only photosystem I is present in the heterocyst. In the two otherAzolla species quantitative shifts in the pigment composition occurred suggesting a lower nitrogen fixation activity. In the cyanobiontAnabaena azollae the heterocyst frequency could reach a value of 44–45%. It is argued that there are two generations of heterocysts in a matureAzolla plant, which are concomitant with two peaks of nitrogen fixation activity correlated with leaf age,i.e. leaf number along the main axis of the plant. At both peaks of maximal N2-ase activity, only 20–25% of the heterocysts present are metabolically active as demonstrated by the reduction of Neotetrazolium chloride (NTC) in the heterocysts and darkening of nuclear emulsions by silver salt reduction. Vegetative cells of the cyanobiont reduce Neotetrazolium chloride (NTC) to formazan more rapidly than has been observed in the free-living heterocystous cyanobacteriumAnabaena cylindrica tested in parallel experiments. This feature may be due to a more permeable cell wall of the vegetative cells of the cyanobiont compared to the free-living form, since the vegetative cells of the symbiont play a role in cross-feeding of the host (Azolla). Evidence is obtained that only the heterocysts of the cyanobiont ofAzolla are involved in the nitrogen fixation process as in free-living heterocystous cyanobacterium species. This situation is different from other cyanobacterial symbioses such as inGunnera, Blasia andAnthoceros, where physiological modifications are reported in the symbiosis with another photosynthetic partner such as the absence of O2 evolution and the absence of photo-fixation of CO2 in the cyanobionts. Pigment composition and N2-ase activity in the symbiotic cyanobacteria of three Azolla species have indicated the superiority of theA. pinnata symbiont.A. pinnata var.pinnata is a semidomesticated form used in S.E. Asia for agricultural purposes (irrigated rice culture) to increase soil fertility. It is suggested that by selection (domestication) more efficient strains (clones) can be obtained, and further that with more advanced techniques such as gene mutation and genetic manipulation even more efficient and for agriculture more beneficial clones can be obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02277375
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  • 9
    Electronic Resource
    Electronic Resource
    The uptake of sodium by perennial ryegrass and its relationship to potassium supply in flowing solution culture (1981)
    Springer
    Plant and soil 60 (1981), S. 73-83 
    Details
    ISSN: 1573-5036
    Keywords: Distribution (shoots roots) ; Flowing solution culture ; H-ions ; Lolium perenne ; Potassium ; Sodium ; Uptake
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The uptake of Na and K by perennial ryegrass from flowing solution culture with monitored concentrations of Na and K was followed in two experiments. In the first, when only 50 and 10 per cent of the K uptake by one set of plants, grown with K held constant at 2.5 μeq 1−1, was supplied to two other linked sets of plants and the balance supplied as Na, there was a rapid decrease in K, and an increase in Na, concentration in the shoots over a 20-day period. However, when compared with the plants grown in K in solution held constant, there was not a complete replacement of Na for K. In the second experiment the concentration of K in the culture solution was held constant at 2 μeq 1−1 and Na at 0, 5, 25, 50 and 100 μeq 1−1. Although uptake of Na increased with increasing concentration in solution the contents in the plants were low,i.e. less than 0.19 per cent and decreased with time. There was an increase in the yield of both shoots and roots with increasing Na in the solution; it was suggested that, during the early stages of growth there may have been an inadequate supply of K and that Na may have substituted for K in some of the non-specific roles of K in the plants. There was evidence in both experiments that a flux of H-ions was involved in the uptake of Na.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02377113
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  • 10
    Electronic Resource
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    The use of soils lightly enriched in15N to screen for N2-fixing activity (1981)
    Springer
    Plant and soil 60 (1981), S. 487-489 
    Details
    ISSN: 1573-5036
    Keywords: Acetylene reduction ; AN ; δ15N ; N2-fixation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary This short communication proposes the use of soils whose organic N has been lightly enriched in15N to screen plants for N2-fixing activity. The major advantage of this approach is that it provides a reliable, integrated estimate of N2-fixation up to any point in the life cycle of the plant, while using very few plants. The feasibility of the method, from the points of view of cost and availability of suitable soils, is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02149646
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  • 11
    Electronic Resource
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    15N2 incorporation and acetylene reduction by Azospirillum isolated from rice roots and soils (1981)
    Springer
    Plant and soil 61 (1981), S. 429-436 
    Details
    ISSN: 1573-5036
    Keywords: Acetylene reduction ; Azospirillum ; 15N2 incorporation ; Rice cultivar
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Nitrogen fixation by strains of Azospirillum isolated from several rice soils and rice cultivars was investigated by15N2 incorporation and C2H2 reduction. C2H2 reducing ability markedly varied among the strains obtained from soils differing widely in their physico-chemical properties. Large variations in15N2 incorporation by Azospirillum isolated from the roots of several rice cultivars were also noticed. The present study reveals that rice cultivars harbour Azospirillum with differential N2-fixing ability and that plant genotype is of importance for optimal associations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02182023
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  • 12
    Electronic Resource
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    Characteristics of nitrogen-fixingKlebsiella oxytoca isolated from wheat roots (1981)
    Springer
    Plant and soil 61 (1981), S. 53-63 
    Details
    ISSN: 1573-5036
    Keywords: Acetylene reduction ; Inoculation ; Klebsiella oxytoca ; Nitrogen fixation ; Wheat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Of 45 fermentative gram negative bacterial isolates examined from wheat roots, three were capable of fixing atmospheric nitrogen as determined by the acetylene reduction technique and by protein contents of cells. A gram negative non-motile facultatively anaerobic bacterial strain capable of N2 fixation was identified asKlebsiella oxytoca ZMK-2. Optimal growth and N2 fixation occurred at pH 6.5. The optimum temperatures for growth under anaerobic conditions ranged between 30°–37°C. Acetylene reduction by intact cells was strikingly inhibited by 0.1 atm. or greater partial pressure of O2. Furthermore, the accumulation of H2 in the gas phase over cultures ofKlebsiella oxytoca ZMK-2 at partial pressures greater than 0.02 atm. resulted in a striking inhibition in the rate of C2H2 reduction. The addition of suspensions of eitherKlebsiella oxytoca ZMK-2 orAzotobacter vinelandii or a mixed culture of these two organisms to axenic cultures of wheat plants produced no significant increase in plant growth as measured by plant dry weight or nitrogen content of plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02277362
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  • 13
    Electronic Resource
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    Soil beidellite and its relation to problems of potassium fertility and poor response to potassium fertilizers (1981)
    Springer
    Plant and soil 62 (1981), S. 299-303 
    Details
    ISSN: 1573-5036
    Keywords: Beidellite ; Fixation ; Potassium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary X-ray diffraction studies were made on soils with and without potassium fertility problems. All soils with clay fractions containing dominant beidellite or vermiculite showed potassium deficiency and lack of response to potassium fertilizer applications. All of the soils containing dominant montmorillonite or other clay minerals contained adequate potassium; on none of these, poor potassium response was reported. Special management practices are needed on the beidellitic and vermiculitic soils to increase potassium and ammonium fertilizer efficiency. Dominance of beidellite in the clay fraction should be reflected in soil classification. Establishment of a ‘beidellite’ family differentiating criterion in the Soil Taxonomy is proposed for this purpose.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02374093
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  • 14
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    Utilisation du15N2 pour estimer la fixation d'azote et sa repartition chez les legumineuses (1981)
    Springer
    Plant and soil 63 (1981), S. 131-139 
    Details
    ISSN: 1573-5036
    Keywords: Acetylene reduction ; Fixed-N distribution in plants ; 15N2 reduction ; Phaseolus vulgaris ; Trifolium arvense ; Trifolium badium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Summary A method for use of15N2 in the study of dinitrogen fixation by complex legumes-Rhizobium associations grown on soil is proposed. The procedure consists in labelling the soil atmosphere with15N2 during short periods of time, measuring15N enrichment in the plants and calculating the total nitrogen fixed during this period. The first results obtained with bean and clover plants demonstrate that after only 7 h of incubation, significative amounts of15N are measured in the plants to allow precise determination of C2H4/N2 ratio which ranged between 2.6 and 3.1 in this experiment. Over longer periods of time, such amounts are meaningfull to follow the pattern of N dynamic from the nodules to the reproductive organs of bean plants.
    Notes: Resumé Les auteurs proposent une méthode d'utilisation du15N2 pour l'étude de la fixation d'azote dans les associations complexes légumineuses-Rhizobium cultivées sur sol. La procédure consiste, à marquer l'atmosphère du sol à l'aide de15N2 et à calculer la quantité d'azote total fixé pendant cette période. Les premiers résultats obtenus sur des haricots et des trèfles démontrent qu'après seulement 7 h d'incubation, des quantités significatives de15N sont mesurées dans les plantes permettant ainsi de déterminer précisément la valeur du rapport C2H4/N2 qui a été établi entre 2,6 et 3,1 dans les conditions de l'expérience. Sur de longues périodes, ces mêmes quantités se sont avérées suffisantes pour suivre la dynamique de l'azote des nodules vers les organes reproducteurs de plants de haricots.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02374592
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  • 15
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    Distributional gradients and variability of macroelement concentrations in the crowns of plantation grownPinus resinosa (AIT.) (1981)
    Springer
    Plant and soil 63 (1981), S. 345-353 
    Details
    ISSN: 1573-5036
    Keywords: Foliage age ; Nitrogen ; Phosphorus ; Potassium ; Red pine ; Tissue sampling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The vertical distribution of inorganic nutrient concentrations in red pine were dependent on the foliage age. Older foliage did not show an average vertical gradient while younger foliage did show a significant gradient. Horizontal gradients across foliage age classes in a branch whorl were consistent for all branch whorls, but the relative difference between the concentration of the current foliage and foliage three years-old or older was dependent on crown position. Coefficients of variation (CV) did not show a variability gradient in the crown for nitrogen and phosphorus. Variability of potassium tended to decrease as foliage age increased.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02370035
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  • 16
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    The influence of temperature and nitrate on vegetative growth and nitrogen accumulation by nodulated soybeans (1981)
    Springer
    Plant and soil 63 (1981), S. 333-344 
    Details
    ISSN: 1573-5036
    Keywords: Acetylene reduction ; Glycine max (L.) Merrill ; Leaf number ; N2 fixation ; Relative growth rate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Inoculated soybeans [Glycine max (L.) Merrill] were grown in controlled environments to evaluate the relationship between temperature and applied NO3−N on growth rates, N accumulation, and acetylene reduction activity during the vegetative growth stage. Soybeans were grown at day/night temperatures of 22/18 and 26/22°C in sand culture with daily applications of 21.4 mM (high) and 2.1 mM (low) NO3−N in a complete nutrient solution for durations of 14, 21, and 42 days after emergence and with an N-free solution. Dry matter and N accumulation were greater at 26/22 than 22/18°C. In general, both increased as the level and duration of applied NO3−N was increased. These increases were attributable to an abbreviation in the interval between emergence and onset of rapid growth. The presence and assimilation of NO3−N, even at the high level, did not inhibit development of functional nodules. Neither mass nor acetylene reduction activity of nodules was reduced by high NO3−N; however, the root mass was increased by NO3−N more than the nodule mass. There was an interaction between temperature and NO3−N on specific nodule activity as measured by acetylene reduction. The specific nodule activity was unaffected by NO3−N at 22/18°C, but at 26/22°C the specific activity was lower in the absence of NO3−N than when NO3−N was present. Apparently, rapid early growth at 26/22°C depleted cotyledonary reserves of N before nodules became active and, thereafter, the plants were unable to develop adequate leaf area to support nodule development and functioning. This result has implications in N fertilization of late-planted soybeans.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02370034
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  • 17
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    Effects of a soil fulvic acid on the growth and nutrient content of cucumber (Cucumis sativus) plants (1981)
    Springer
    Plant and soil 63 (1981), S. 491-495 
    Details
    ISSN: 1573-5036
    Keywords: Calcium ; Copper ; Flowers ; Iron ; Leaves ; Magnesium ; Nitrogen ; Nutrient uptake ; Phosphorus ; Potassium ; Koots ; Shoots ; Zinc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Cucumber (Cucumis sativus) plants were grown in Hoagland solution to which 20 to 2000 ppm of a soil fulvic acid (FA) were added. The addition of 100 to 300 ppm of FA produced highly significant increases in the growth and development of above and below ground plant parts, in the uptake of nutrient elements (N, P, K, Ca, Mg, Cu, Fe and Zn), and in the formation of numbers of flowers per plant. Effects of adding 500 and more ppm of FA were less beneficial.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02370049
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