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  • 1985-1989  (2)
  • 1988  (2)
  • Azolla pinnata  (1)
  • 23.20.Js
  • Rice
  • 1
    Electronic Resource
    Electronic Resource
    Effect of split application of phosphorus on the growth ofAzolla and low land rice (1988)
    Springer
    Nutrient cycling in agroecosystems 16 (1988), S. 109-117 
    Details
    ISSN: 1573-0867
    Keywords: Azolla pinnata (Vietnam) ; intercropping ; N accumulation ; phosphorus fertilizer ; Rice ; Soil fertility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract TheAzolla pinnata (Vietnam) inoculated in rice field 10 days after transplanting (DAT) at a rate of 500 kg ha−1 fresh biomass along with phosphorus fertilizer application produced a mat on the water surface at 30 DAT. The three split application of phosphorus as 4.4, 2.2 and 2.2 kg P ha−1 applied at 10, 15 and 20 DAT, respectively produced 67% more biomass and 57% more Nitrogen inAzolla than those obtained by applying 8.8 kg P ha−1 at 10 DAT. Whereas, the two splits of phosphorus as 6.6 and 2.2 kg and 4.4 and 4.4 kg P ha−1 applied 10 and 15 DAT, respectively produced 20 and 33% more biomass and 14 and 27% more Nitrogen only. The three split application of phosphorus also increased the grain and straw yields, panicle number and weight, nitrogen concentration and its uptake in rice significantly over application of the entire amount once only. An increase of 10% grain yield and 13% straw yields was observed when 8.8 kg P ha−1 was applied in three splits rather than applied at one time. On the average an increase of 24% grain and 23% straw yields in rice were observed due toAzolla intercropping and 22% and 16%, respectively due to phosphorus application. The intercropping ofAzolla with rice along with phosphorus application also increased the fertility level of soil by increasing the total nitrogen, organic carbon and available phosphorus of soil.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01049768
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of different nitrogen sources on growth, acetylene reduction activity ofAzolla pinnata and yield of rice (1988)
    Springer
    Plant and soil 107 (1988), S. 165-171 
    Details
    ISSN: 1573-5036
    Keywords: acetylene reduction activity ; Azolla pinnata ; fresh biomass ; N-sources ; N-uptake ; total crop
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The effect of nitrogenous sources like ammonium sulphate (AS), prilled urea (U), urea super granule (USG) and farm yard manure (FYM) was studied on the fresh biomass (FB) and acetylene reduction activity (ARA) ofAzolla pinnata, R. Brown (Bangkok isolate), grown as a dual crop with rice, and rice yield in three successive seasons. Irrespective of the N-sources and seasons, the FB and ARA of Azolla were observed to be maximum on 14th day after Azolla inoculation (DAI). The different N-sources had significant effect on the ARA and to a lesser extent on the FB of Azolla. The treatment without fertilizer-N (control) exhibited highest ARA, FB and total N-content of Azolla. These were inhibited to a lesser extent by USG and FYM, though used at higher rates of 75 kg N ha−1 and 90 kgN ha−1 respectively, compared to that by AS and U, used at lower rates of 45kg N ha−1 each.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02370543
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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