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
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