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  • NH 4 + fixation  (1)
  • Yield  (1)
Document type
Keywords
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Years
  • 1
    Electronic Resource
    Electronic Resource
    Effect of Leucaena leucocephala (Lam) de Wit. as a green manure on nitrogen uptake and yield of rice (1990)
    Springer
    Biology and fertility of soils 9 (1990), S. 68-70 
    Details
    ISSN: 1432-0789
    Keywords: Leucaena leucocephala ; Green manure ; N Uptake ; Yield ; Wetland rice ; Oryza sativa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Field studies were conducted over two seasons to examine the effect of Leucaena leucocephala as a green manure on the N uptake and yield of rice grown under lowland conditions. The treatments were 0, 4, 8, and 12t Leucaena ha-1 with 0,44, and 88 kg N ha-1 as urea in a factorial combination. N uptake was evaluated at maximum tillering, panicle initiation, and harvest. The incorporation of Leucaena increased N uptake throughout the vegetative period in both seasons, irrespective of the mineral-N level. At all levels of N, the grain yield increased significantly following the incorporation of Leucaena, and in both seasons the Leucaena treatment of 8 t ha-1 was almost as effective as the highest mineral-N application.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00335864
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    6. Ammonium dynamics of puddled soils in relation to growth and yield of lowland rice (1986)
    Springer
    Nutrient cycling in agroecosystems 9 (1986), S. 117-130 
    Details
    ISSN: 1573-0867
    Keywords: exchangeable NH 4 + ; nonexchangeable NH 4 + ; 15N tracer technique ; NH 4 + fixation ; vermiculite
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The release of non-exchangeable (fixed) NH 4 + and the importance of exchangeable NH 4 + at transplanting (initial exchangeable NH 4 + ) for rice (Oryza sativa L.) growth was studied in representative lowland rice soils of the Philippines. The experiments showed that initial exchangeable ammonium behaved like fertilizer N and thus may serve as a valuable guideline for nitrogen fertilizer application rates when calculated on a hectare basis. By using the15N tracer technique it was found that nonexchangeable ammonium in soil may contribute to the nitrogen supplying capacity of lowland rice soils. Fixation and release of NH 4 + seem to be more dependent on the form of clay minerals than on clay content. In soils rich in vermiculite non-exchangeable ammonium should be considered together with other available N sources such as exchangeable ammonium for N fertilizer recommendations for lowland rice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01048698
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    Paper (German National Licenses)
    Fulltext
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