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  • 15N  (1)
  • 15N-Oryza sativa  (1)
  • Atriplex  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Availability of soil and fertilizer nitrogen to wheat (Triticum aestivum L.) following rice-straw amendment (1990)
    Springer
    Biology and fertility of soils 10 (1990), S. 134-138 
    Details
    ISSN: 1432-0789
    Keywords: 15N ; N immobilization ; N loss ; N uptake ; Rice straw ; Soil N ; Wheat ; Triticum aestivum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A pot experiment was conducted to study the N availability to wheat and the loss of 15N-labelled fertilizer N as affected by the rate of rice-straw applied. The availability of soil N was also studied. The straw was incorporated in the soil 2 or 4 weeks before a sowing of wheat and allowed to decompose at a moisture content of 60% or 200% of the water-holding capacity. The wheat plants were harvested at maturity and the roots, straw, and grains were analysed for total N and 15N. The soil was analysed for total N and 15N after the harvest to determine the recovery of fertilizer N in the soil-plant system and assess its loss. The dry matter and N yields of wheat were significantly retarded in the soil amended with rice straw. The availability of soil N to wheat was significantly reduced due to the straw application, particularly at high moisture levels during pre-incubation, and was assumed to cause a reduction in the dry matter and N yields of wheat. A significant correlation (r=0.89) was observed between the uptake of soil N and the dry matter yield of wheat with different treatments. In unamended soil 31.44% of the fertilizer N was taken up by the wheat plants while 41.08% of fertilizer N was lost. The plant recovery of fertilizer N from the amended soil averaged 30.78% and the losses averaged 45.55%
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00336249
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Fate and interaction with native soil N of ammonium N applied to wetland rice (Oryza sativa L.) grown under saline and non-saline conditions (1992)
    Springer
    Biology and fertility of soils 13 (1992), S. 102-107 
    Details
    ISSN: 1432-0789
    Keywords: Added N interaction ; Fertilizer N ; 15N-Oryza sativa ; Priming effect ; Saline soil conditions ; Wetland rice
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The effect of salts on the balance of fertilizer N applied as 15N-labelled ammonium sulphate and its interaction with native soil N was studied in a pot experiment using rice (Oryza sativa L.) as a test crop. The rice crop used 26%–40% of the applied N, the level of applied N and salts showing no significant bearing on the uptake of fertilizer N. Losses of fertilizer N ranged between 54% and 68% and only 5%–8% of the N was immobilized in soil organic matter. Neither the salts nor the rate of N application had any significant effect on fertilizer N immobilization. The effective use of fertilizer N (fertilizer N in grain/fertilizer N in whole plant) was, however, better in the non-saline soil. The uptake of unlabelled N (N mineralized from soil organic matter and that originating from biological N2 fixation in thes rhizosphere) was inhibited in the presence of the salts. However, in fertilized soil, the uptake of unlabelled N was significantly enhanced, leading to increased A values [(1-% Ndff/% Ndff)x N fertilizer applied, where Ndff is N derived from fertilizer], an index of interaction with the added N. This added N interaction increased with increasing levels of added N. Since the extra unlabelled N taken up by fertilized plants was greater than the fertilizer N immobilized, and the root biomass increased with increasing levels of added N, a greater part of the added N interaction was considered to be real, any contribution by an apparent N interaction (pool substitution or isotopic displacement) to the total calculated N interaction being fairly small. Under saline conditions, for the same level of fertilizer N addition, the added N interaction was lower, and this was attributed to a lower level of microbial activity, including mineralization of native soil N, rootdriven immobilization of applied N, and N2 fixation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00337343
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Associative N2-fixation in plants growing in saline sodic soils and its relative quantification based on15N natural abundance (1991)
    Springer
    Plant and soil 137 (1991), S. 67-74 
    Details
    ISSN: 1573-5036
    Keywords: Atriplex ; Azospirillum ; biological nitrogen fixation ; 13C ; Cynodon ; Desmostachya ; Enterobacter ; Kallar grass ; Kochia ; Klebsiella ; 15N natural abundance ; Polypogon ; saline soil
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Saline-sodie soils are characterized by a very low nitrogen and organic matter content and thus are practically non fertile. However under these conditions, certain plants have been found to grow luxuriantly. One of such plants,Leptochloa fusca (Kallar grass) has exhibited nitrogenase activity associated with its roots as determined by acetylene reduction assay (ARA). Quantification of such nitrogen fixation was also carried out using15N isotope dilution technique. In addition to Kallar grass, other plant species growing in saline sodic soils namelyAtriplex amnicola, A. lentiformis, Sporobolus sp.,Kochia indica, Desmostachya bipinnata, Cynodon dactylon, Suaeda fruiticosa andPolypogon monspilensis have been screened for the presence of root associated nitrogenase activity. Some of the plant species tested showed high excised root acetylene reduction activity (ERARA). Isolation of diazotrophs from various fractions of the rhizosphere has also been carried out.Azospirillum was the dominant organism in niches closer to the roots, whereas there was a preponderance of the members of the family Enterobacteriaceae in general. In order to have a relative estimate of the nitrogen fixing ability of different plant species screened, the delta15N values of plant tops were estimated and were correlated with their ARA values. The delta13C values of these plants were also determined which indicated that all the plants tested exceptP. monspilensis had the C-4 photosynthetic pathway.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02187434
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    Paper (German National Licenses)
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