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  • Azadirachta indica  (3)
  • Denitrification  (3)
  • Farmyard manure  (2)
  • 15N-balance  (1)
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Keywords
Publisher
Years
  • 1
    Electronic Resource
    Electronic Resource
    Isolation of a tetranortriterpenoid from Azadirachta indica
    Amsterdam : Elsevier
    Phytochemistry 23 (1984), S. 2899-2901 
    Details
    ISSN: 0031-9422
    Keywords: 6α-hydroxyazadirone ; Azadirachta indica ; Meliaceae ; ^1^3C NMR. ; neem leaves ; nimocinol ; tetranortriterpenoid
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0031-9422(84)83037-X
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Phenolic tricyclic diterpenoids from the bark of Azadirachta indica
    Amsterdam : Elsevier
    Phytochemistry 27 (1988), S. 3903-3907 
    Details
    ISSN: 0031-9422
    Keywords: 2D-NMR ; Azadirachta indica ; Meliaceae ; antibacterial activity. ; diterpenoids ; neem stem bark ; nimbionol ; nimbionone
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0031-9422(88)83041-3
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  • 3
    Electronic Resource
    Electronic Resource
    Isolation of a triterpenoid from Azadirachta indica
    Amsterdam : Elsevier
    Phytochemistry 25 (1986), S. 2183-2185 
    Details
    ISSN: 0031-9422
    Keywords: Azadirachta indica ; Meliaceae ; neem leaves ; nimbocinone. ; triterpenoid
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0031-9422(86)80087-5
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  • 4
    Electronic Resource
    Electronic Resource
    Denitrification and total fertilizer-N losses from an irrigated cotton field (2000)
    Springer
    Biology and fertility of soils 31 (2000), S. 270-278 
    Details
    ISSN: 1432-0789
    Keywords: Key words Acetylene inhibition ; Denitrification ; Cotton ; Nitrous oxide entrapment ; 15N-balance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  In a 2-year field study, denitrification loss was measured from an irrigated sandy-clay loam under cotton receiving urea-N at 158–173 kg ha–1. An acetylene inhibition-soil core method was employed for the direct measurement of denitrification, considering also the N2O entrapped in the soil. Taking into account the N2O evolved from soil cores and that entrapped in the soil, a total of 65.7 kg N ha–1 and 64.4 kg N ha–1 was lost due to denitrification during the 1995 and 1996 cotton-growing seasons, respectively. Most (〉70%) of the denitrification loss occurred during June–August, a period characterized by high soil temperatures and heavy monsoon rains. On average, 35% of the denitrification-N2O was found entrapped in the soil and the amount of entrapped N2O was significantly correlated with head space N2O concentration and with water-filled pore space. 15N-balance during the 1996 growing season revealed a loss of 71.8 kg N ha–1. It was concluded that a substantial proportion of the fertilizer-N applied to irrigated cotton is lost under the semiarid subtropical climatic conditions prevailing in the Central Punjab region of Pakistan and that denitrification is the major N loss process under irrigated cotton in this region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003740050656
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  • 5
    Electronic Resource
    Electronic Resource
    Carbon availability and microbial biomass in soil under an irrigated wheat-maize cropping system receiving different fertilizer treatments (1997)
    Springer
    Biology and fertility of soils 25 (1997), S. 63-68 
    Details
    ISSN: 1432-0789
    Keywords: Key words Microbial biomass ; Carbon availability ; Microbial biomass turnover ; Wheat-maize rotation ; Urea ; Farmyard manure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Seasonal changes in carbon availability and microbial biomass were studied in soil under an irrigated wheat-maize cropping system receiving different fertilizter treatments over the past 10 years. Treatments included N-100 and N-200 (urea at 100 and 200kgNha–1 year–1, respectively), FYM-16 and FYM-32 (farmyard manure at 16 and 32tha–1 year–1, respectively) and a control (unfertilized). Aerobically mineralizable carbon (AMC; C mineralized after 10 days aerobic incubation at 30°C) increased (13–16%) under wheat at both rates of urea whereas under maize it increased (22%) only with the lower rate of urea. Farmyard manure also increased the content of soil AMC under both crops, the effect being two- to threefold higher under wheat than under maize. Urea application caused an 32–78% increase in the specific respiratory activity (SRA) under wheat but caused an 11–50% decrease during the maize season. Farmyard manure also resulted in a higher SRA under both crops but only at the higher application rate. Under wheat, microbial biomass C (MBC) decreased in urea-treated plots but showed a slight increase at the higher rate of FYM. During the maize season, MBC was higher under both urea (42–46%) and FYM (36–47%) treatments as compared to the control. Microbial biomass turnover rate was highest for FYM-32 (2.08), followed by FYM-16 and urea treatments (1.35–1.49); control plots showed a turnover rate of 0.82. The higher AMC and SRA during the active growth period of wheat than that of maize indicated that root-derived C from wheat was higher in amount and more easily degradable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003740050281
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  • 6
    Electronic Resource
    Electronic Resource
    Denitrification losses from an irrigated sandy-clay loam under a wheat-maize cropping system receiving different fertilizer treatments (1997)
    Springer
    Biology and fertility of soils 26 (1997), S. 35-42 
    Details
    ISSN: 1432-0789
    Keywords: Key words Acetylene inhibition ; Denitrification ; Farmyard manure ; Irrigated wheat-maize ; Urea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Studies were conducted on denitrification in the plough layer of an irrigated sandy-clay loam under a wheat-maize cropping system receiving different fertilizer treatments. The treatments were: N-100 (urea-N at 100kgha–1year–1), N-200 (urea-N at 200kgha–1year–1), FYM-16 (farmyard manure at 16 tonnes ha–1year–1), FYM-32 (farmyard manure at 32 tonnesha–1year–1) and the control (unfertilized). Averaged across sampling dates during the wheat season, the denitrification rate as measured by the C2H2-inhibition/soil-core incubation method was highest in N-200 (83gNha–1day–1), followed by FYM-32 (60gNha–1day–1, N-100 (51gNha–1day–1), FYM-16 (47gNha–1day–1) and the control (33gNha–1 day–1). During the maize growing season, average denitrification rate was highest in FYM-32 (525gNha–1day–1), followed by FYM-16 (408gNha–1day–1), N-200 (372gNha–1day–1, N-100 (262gNha–1day–1) and the control (203gNha–1day–1). Denitrification loss integrated over the whole vegetation period was at a maximum under FYM-32 (13.9kgNha–1), followed by N-200 (11.8kgNha–1), FYM-16 (10.6kgNha–1) and N-100 (8.0kgNha–1), whereas the minimum was observed for the control (5.8kgNha–1). Under both crops, denitrification was significantly correlated with water-filled pore space and soil NO3 –-N. The best multiple regression models accounted for 52% and 70% of the variability in denitrification under wheat and maize, respectively. Results indicated that denitrification is not an important N loss mechanism in this well-drained, irrigated sandy-clay loam under a wheat-maize cropping system receiving fertilizer inputs in the range of 100–200kgNha–1year–1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003740050340
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  • 7
    Electronic Resource
    Electronic Resource
    Comparison of two versions of the acetylene inhibition/soil core method for measuring denitrification loss from an irrigated wheat field (1999)
    Springer
    Biology and fertility of soils 29 (1999), S. 328-331 
    Details
    ISSN: 1432-0789
    Keywords: Key words Acetylene inhibition ; Soil core technique ; Denitrification ; Irrigation ; Nitrous oxide entrapment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  Two versions of the acetylene inhibition (AI)/soil core method were compared for the measurement of denitrification loss from an irrigated wheat field receiving urea-N at a rate of 100 kg ha–1. With AI/soil core method A, the denitrification rate was measured by analysing the headspace N2O, followed by estimation of N2O dissolved in the solution phase using Bunsen absorption coefficients. With AI/soil core method B, N2O entrapped in the soil was measured in addition to that released from soil cores into the headspace of incubation vessels. In addition, the two methods were also compared for measurement of the soil respiration rate. Of the total N2O produced, 6–77% (average 40%) remained entrapped in the soil, whereas for CO2, the corresponding figures ranged from 12–65% (average 44%). The amount of the entrapped N2O was significantly correlated with the water-filled pore space (WFPS) and with the N2O concentration in the headspace, whereas CO2 entrapment was dependent on the headspace CO2 concentration but not on the WFPS. Due to the entrapment of N2O and CO2 in soil, the denitrification rate on several (18 of the 41) sampling dates, and soil respiration rate on almost all (27 of the 30) sampling dates were significantly higher with method B compared to method A. Averaged across sampling dates, the denitrification rate measured with method B (0.30 kg N ha–1 day–1) was twice the rate measured with method A, whereas the soil respiration rate measured with method B (34.9 kg C ha–1 day–1) was 1.6 times the rate measured with method A. Results of this study suggest that the N2O and CO2 entrapped in soil should also be measured to ensure the recovery of the gaseous products of denitrification by the soil core method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003740050560
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