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  • Articles  (14)
  • Nitrogen  (14)
  • 1985-1989  (14)
  • 1950-1954
  • 1945-1949
  • 1985  (14)
  • Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition  (14)
  • Sociology
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  • Articles  (14)
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Keywords
Publisher
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  • 1985-1989  (14)
  • 1950-1954
  • 1945-1949
Year
Topic
  • 1
    Electronic Resource
    Electronic Resource
    Nutritional effects of non-steady state soil salinity on a salt-tolerant wheat cultivar (1985)
    Springer
    Plant and soil 83 (1985), S. 223-231 
    Details
    ISSN: 1573-5036
    Keywords: Absorption ; Accumulation ; Calcareous soil ; Calcium ; Chloride ; Leaching ; Magnesium ; Nitrogen ; Phosphate ; Potassium ; Sea water ; Triticum aestivum L. ; Wheat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary On an initially non-saline calcareous soil, the advanced wheat line RI 3748 (Triticum aestivum L.) was irrigated by sea water dilutions having ECi-2, 12, 18 and 24 mS cm−1 at 20°C in quantities equal to 1.1, 1.3, and 1.5 times evapotranspiration. Leaching of the soil (L) significantly affected concentrations of N, Ca, P, Na, Cl, and Mg in topgrowth at specific ages. These effects were attributed to the non-steady state salinity of the rootzone and were found to be of minor importance with respect to plant performance. Concentrations of Ca and N did not respond to ECi. Nitrogen and P levels were very low under all ECi levels and decreased rapidly until maturity. Sodium and Cl attained fairly high concentrations in plant tops, in response to ECi and plant age. However, it was found that up to ECi=12 increased absorption of Cl controlled its concentration whereas above this level, growth inhibition was the cause of higher Cl concentrations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02184294
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  • 2
    Electronic Resource
    Electronic Resource
    Nitrogen and potassium fertilization and environmental factors affecting the grass tetany hazard of wheat forage (1985)
    Springer
    Plant and soil 86 (1985), S. 173-184 
    Details
    ISSN: 1573-5036
    Keywords: Calcium ; Magnesium ; Nitrogen ; Potassium ; Soil moisture ; Temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The effects of temperature and soil moisture levels on the chemical composition of wheat forage grown in growth chambers were studied. In addition to the environmental variables, K and N fertilization effects were studied. In all the studies, increasing levels of K fertilization depressed the Mg and Ca concentration of the shoots. Nitrogen fertilization increased the Mg concentration but had no effect on the Ca concentration of the plants. N fertilization depressed the K concentration in the soil moisture experiment, but had no effect on K concentration in the temperature experiment. Increasing the temperature from 10 to 20°C did not affect the Mg and Ca concentration of the shoots, but the K concentration declined due to dilution effects caused by the greater yield at the higher temperature. In the soil moisture level experiment the K, Mg and Ca concentration in wheat tended to decline with soil moisture level due to dilution effects. Calculations showed that uptake of K was regulated primarily by diffusion of K from the soil to the plant root and that the uptake of Mg was regulated by the uptake process of the plant root and not by the nutrient transport process through the soil.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02182892
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  • 3
    Electronic Resource
    Electronic Resource
    Nitrogen-induced boron deficiency in lucerne (1985)
    Springer
    Plant and soil 86 (1985), S. 443-446 
    Details
    ISSN: 1573-5036
    Keywords: Alfalfa ; Boron ; Lucerne ; Medicago sativa ; Nitrogen ; Nutrient interaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary In a glasshouse experiment with a boron deficient soil the application of nitrogen was found to decrease the boron concentration and boron uptake by lucerne (Medicago sativa). Without added boron, nitrogen applications killed the lucerne, probably by inducing severe boron deficiency. With added boron, the lowest rate of nitrogen application increased lucerne yield but further additions depressed yields. The effect was due to a physiological interaction rather than an effect of the nitrogen on the availability of the boron in the soil.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02145464
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  • 4
    Electronic Resource
    Electronic Resource
    Influence of nitrogen and phosphorus fertilizers on ammonia-assimilating enzymes of Azolla (1985)
    Springer
    Plant and soil 88 (1985), S. 271-273 
    Details
    ISSN: 1573-5036
    Keywords: Ammonia assimilating enzymes ; Anabaena azollae ; Azolla ; Nitrogen ; Phosphorus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A field experiment was conducted and studied the effect of nitrogen and phosphorus on ammonia assimilating enzymes of Azolla. Nitrogen and phosphorus at 30 and 60 kg/ha respectively were tested andAzolla pinnata was inoculated at 200 g/m2. The Azolla samples were drawn on 24th hr, 7th day and 14th day and the ammonia assimilating enzymes glutamine synthetase (GS), glutamate synthase (GOGAT) and glutamine dehydrogenase (GDH) were estimated. Nitrogen and phosphorus have markedly suppressed the GDH activity but fertilizer nitrogen has no significant influence in inhibiting the enzyme activity of GOGAT and GS. In general phosphorus application also has stimulated the GS activity significantly during the first sampling period of 24th hour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02182453
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  • 5
    Electronic Resource
    Electronic Resource
    Fertilization management of crops irrigated with saline water (1985)
    Springer
    Plant and soil 89 (1985), S. 285-299 
    Details
    ISSN: 1573-5036
    Keywords: Calcium ; Chloride ; Ion antagonism ; Magnesium ; Nitrate ; Nitrogen ; Nutrition disorders ; Phosphorus ; Salinity-fertility relationship ; Sodium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Available data concerning nutrition and fertilization effects on crops irrigated with saline water are presented and discussed. Published data on the salinity-fertility relationship are, at least to some extent, contradictory; both positive and negative effects as well as no effect of fertilization on salinity tolerance have been recorded. However, a great deal of the experimental work supports the view that standard fertilization recommendations for non-saline conditions are also suitable for saline conditions. In addition, available data indicate that the apparent salt tolerance of agricultural crops varies with soil fertility level. Consequently, crops showing exceptionally high apparent salt tolerance at a low fertility level become more sensitive when adequately fertilized, although the absolute yield may be greatly increased. On the other hand, some data seem to show a real increase in salinity tolerance under improved fertility conditions. Important information concerning the responses of plants to salinity under various fertility levels was obtained by tissue analysis. It should be kept in mind that this information may be influenced also by the plant species and by environmental conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02182248
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  • 6
    Electronic Resource
    Electronic Resource
    Assimilation of carbon by the soil biomass (1985)
    Springer
    Plant and soil 86 (1985), S. 101-112 
    Details
    ISSN: 1573-5036
    Keywords: Alfalfa ; Assimilation ; Carbon ; Corn leaf ; Dissimilation ; Glucose ; Nitrogen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The stoichiometry of soil biomass synthesis was studied with glucose, glucose+N, alfalfa and corn leaf amended soil. Equations describing the quantitative relationship found for the dissimilation of substrate C and related oxidative assimilation of C by the biomass were developed. The analytical approach involved measurement of soluble C consumed by persulfate oxidation (POC). Carbon flow patterns showed that the observed decrease in POC correlated well with an increase in cell C (0–44 h). With glucose alone 47% of the initial POC was consumed and with glucose+N 99% of the POC was utilized. Alfalfa and corn leaf residues also showed sharp decreases in initial POC. Marked differences in C uptake were noted depending on the soil treatment and specific incubation period. An equation was developed which predicts C assimilation level and related soil biomass weights from decreases in POC.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02185030
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of presowing seed treatment with molybdenum and cobalt on growth, nitrogen and yield in bean (Phaseolus vulgaris L.) (1985)
    Springer
    Plant and soil 86 (1985), S. 283-285 
    Details
    ISSN: 1573-5036
    Keywords: Bean ; Cobalt ; Molybdenum ; Nitrogen ; Nodulation ; Seed treatment ; Yield
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Bean (Phaseolus vulgaris L. Cv. ‘Burpees Stringless’) seeds were subjected to two cycles of presowing soaking and drying treatments with sodium molybdate and cobalt nitrite at 1 and 5 ppm concentrations used separately and also in combination. Sodium molybdate 2 ppm and cobalt nitrite 1 ppm used singly proved better than the remaining treatments with respect to nodulation, dry matter, nitrogen and yield. Combined treatment with sodium molybdate and cobalt nitrite did not produce additive effect on any parameter studied compared to their usage alone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02182905
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  • 8
    Electronic Resource
    Electronic Resource
    Nitrogen cycling in dense plantings of hybrid poplar and black alder (1985)
    Springer
    Plant and soil 87 (1985), S. 195-208 
    Details
    ISSN: 1573-5036
    Keywords: Alnus glutinosa ; Black alder ; Dinitrogen fixation ; Hybrid poplar ; Nitrogen ; Nitrogen cycling ; Short-rotation plantation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Nitrogen cycling was studied during the third growing season in pure and mixed plantings (33×33 cm spacing) of hybrid poplar and black alder in southeastern Canada. After 3 years, hybrid poplar growth and N content of living tissues in a plot and of individual hybrid poplar plants increased with the proportion of black alder in a planting. No differences were detected among N contents of individual alder plants regardless of plot treatment. Black alder allocated a larger portion of its N to roots than hybrid poplar. Symbiotic nitrogen fixation was estimated to account for 80% of the nitrogen in aboveground alder tissues in the pure treatment using natural15N dilution. N return in leaf litter was estimated to be 70kg ha−1 in the pure alder treatment and decreased to a minimum of 20 kg ha−1 in the pure hybrid poplar plots. No difference was detected among treatments for throughfall N content. Nitrogen concentration in roots and leaf litterfall of black alder was higher than hybrid poplar. Significant soil N accretion occurred in mixed plantings containing two alders to one poplar and pure black alder plantings. Nitrogen availability (NO3−N) increased with the amount of black alder in a plot. Results suggest that the early increase in nitrogen accumulation of hybrid poplar in mixed treatments can be attributed to an increase of total soil N availability resulting from the input of large amounts of N from easily mineralizable alder tissue.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02277660
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  • 9
    Electronic Resource
    Electronic Resource
    Influence of washing on elemental analysis of leaves of fieldgrown crop plants (1985)
    Springer
    Plant and soil 88 (1985), S. 93-100 
    Details
    ISSN: 1573-5036
    Keywords: Aluminum ; Calcium ; Copper ; Glycine max ; Iron ; Magnesium ; Manganese ; Nitrogen ; Phosphorus ; Potassium ; Sorghum bicolor ; Triticum aestivum ; Zea Mays ; Zinc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Information is limited on soil contamination of leaves from field-grown row crops, especially with respect to aluminum (Al) analyses. The objective of this study was to determine the influence of washing leaf samples with either deionized water or detergent solution on elemental analyses for several agronomic crop plants. The crop plants sampled were corn (Zea mays L.), soybean (Glycine max L. Merr.), grain sorghum (Sorghum bicolor L. Moench), and wheat (Triticum aestivum L.). The crops were grown on a range of soil types, soil pH values, and tillage practices. Samples of upper leaves and lower leaves were collected separately. The samples were either not washed, washed with deionized water, or washed with detergent solution. After drying, grinding, and digesting, the samples were analyzed for Al, nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), iron (Fe), manganese (Mn), zinc (Zn), and copper (Cu). For all crop plants and conditions studied, there was no effect on measured N, P, K, Ca, Mg, Mn, Zn, or Cu concentrations, but measured Al and Fe concentrations were influenced by washing. In general, washing had a greater effect on Al analyses than on Fe analyses. Soybean samples were most affected by washing, while wheat samples seemed to be least affected. The results reflected greater contamination of lower leaves than upper leaves. Decontamination procedures appear necessary prior to Al and Fe analyses of field-grown crop plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02140668
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  • 10
    Electronic Resource
    Electronic Resource
    Simulation of nitrogen regime in loess soils in the winter half-year: comparison between field measurements and simulations (1985)
    Springer
    Plant and soil 83 (1985), S. 419-432 
    Details
    ISSN: 1573-5036
    Keywords: Loess soil ; Nitrogen ; Simulation model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Periodic N-min measurements were used to validate a simple model describing N regime of cropped Loess soils over the winter half-year. The model comprises of submodels for N mineralization, nitrate transport and N uptake by plants. The description of mineralization is based on kinetic studies in the lab by means of incubation experiments. The transport model is as described earlier4 avoiding an explicite modeling of water movement through soils. Plant uptake for this period was modelled only roughly. The agreement between measurement and simulation is for about 90% of all cases within the confidence interval of the measured values. Possible reasons for the observed deviations are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02184454
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  • 11
    Electronic Resource
    Electronic Resource
    Distribution of N, P, K, Ca, Mg, S, Zn, Fe, Mn and Cu in groundnut (1985)
    Springer
    Plant and soil 84 (1985), S. 269-273 
    Details
    ISSN: 1573-5036
    Keywords: Calcium ; Copper ; Groundnut ; Iron ; Kernel ; Kharif ; Leaflet ; Magnesium ; Manganese ; Nitrogen ; Petiole ; Phosphorus ; Potassium ; Root ; Shell ; Stem ; Sulphur ; Summer ; Zinc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Concentration of N, P, K, Ca, Mg and S in summer groundnut crop was higher than in kharif while Zn, Fe, Mn and Cu contents were higher in summer crop. Kernel's N, P and Zn; Leaflet's Ca and Mn; Stem's K and Fe; Root's S and Cu and Petiole's Mg contents were highest. Shell's N, P, K, Mg, S, Zn and Cu; Kernel's Ca, Fe and Mn contents were the least. N, P, K, S, Zn and Cu concentrations decreased linearly as the crop grew. Ca, Mg, Fe and Mn concentrations did not display any distinct pattern. Ca concentration was positively correlated with pod yield in both the seasons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02143189
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  • 12
    Electronic Resource
    Electronic Resource
    Effect of mild drying on the mineralization of soil nitrogen (1985)
    Springer
    Plant and soil 84 (1985), S. 175-179 
    Details
    ISSN: 1573-5036
    Keywords: Biomas ; Drying ; Mineralization ; Nitrogen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Drying soil to −100 kPa increased the subsequent mineralization of nitrogen under optimal moisture conditions. The effect was greater when the soils were dried to −1500 Pa. Mineralization was greater after four cycles of wetting and drying than after one. Depending on the drying conditions, the amount of nitrogen mineralized after drying to −1500 Pa was between 6.8 and 18.2% of that mineralized after chloroform fumigation. After drying the soils the average ratio of ΔCO2-C respired to Δmin N was 21.1–22.3 depending on the drying conditions, whereas after chloroform treatment and autoclaving the ratio was 6.0 and 9.9 respectively. The effect of drying on nitrogen mineralization is attributed to two causes: the death and subsequent lysis of a small proportion of the soil organisms, and to the desorption of organic substances with a wide C/N ratio. Because of the stimulation of even mild drying conditions, marked differences in mineralization rates of soil nitrogen between cropping seasons must be expected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02143181
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  • 13
    Electronic Resource
    Electronic Resource
    Nutrient proportions in foliage of semi-mature loblolly pine (1985)
    Springer
    Plant and soil 86 (1985), S. 27-34 
    Details
    ISSN: 1573-5036
    Keywords: Loblolly pine ; Nitrogen ; Nutrient ratios ; Phosphorus ; Pinus taeda
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Nitrogen and phosphorus limitations to growth are common in many loblolly pine (Pinus taeda) stands. Interactions of these nutrients may complicate interpretation of foliar nutrient analysis for predicting response to forest fertilization. Proportions of foliar nutrient concentrations (and the changes in these proportions following fertilization) were examined in 36 semi-mature loblolly pine plantations in the southeastern United States. Mean proportions of nutrient concentrations (N∶P∶K∶Ca∶Mg) for non-fertilized stands were 100∶9.3∶36.5∶17.2∶9.2. Potassium and phosphorus were higher. Nitrogen fertilization generally decreased the P∶N ratio and enhanced growth, indicating a nitrogen deficiency in most stands under study. Additions of nitrogen and phosphorus together yielded a significant increase in the P∶N ratio. Effects of fertilization effects on other nutrient concentration ratios were also examined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02185022
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  • 14
    Electronic Resource
    Electronic Resource
    Phosphorus accumulation by lignotubers of jarrah (Eucalyptus marginata Donn ex Sm.) seedlings grown in a range of soils (1985)
    Springer
    Plant and soil 86 (1985), S. 225-232 
    Details
    ISSN: 1573-5036
    Keywords: Eucalyptus marginata ; Lignotuber ; Nitrogen ; Phosphorus ; Seedlings ; Virgin soils X-ray probe microanalysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Jarrah seedlings were grown in six virgin Western Australian soils for up to 27 months. Lignotubers were produced in all soils and formed 10–16% of plant dry weight. The phosphorus concentration in the lignotuber (250–800 μg g−1) was nearly twice that in the stem and roots. The lignotuber contained 10–30% of total plant phosphorus and like the leaves was a sink for phosphorus. In one lateritic soil the phosphorus concentrations of lignotuber and stem barks were similar. However, in the same plants the concentration of phosphorus in the lignotuber wood was five times the phosphorus concentration in stem wood. Hence both lignotuber bark and sap wood in young jarrah seedlings are storage sites for phosphorus. X-ray probe analysis showed that wood phosphorus was associated with the ray parenchyma. Unlike phosphorus, nitrogen did not accumulate in the lignotuber and the concentrations of nitrogen were similar for roots, lignotubers and stems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02182897
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