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Influence of rate and time of Azolla caroliniana inoculation on its growth and nitrogen fixation and yield of rice (Oryza sativa)

Indian Agricultural Research Journals

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Title Influence of rate and time of Azolla caroliniana inoculation on its growth and nitrogen fixation and yield of rice (Oryza sativa)
 
Creator Singh, D P
Singh, P K
 
Subject —
 
Description An experiment was conducted during wet season 1990 and dry season 1991 to study the effect of rate and time of Azolla carolliniana. Wildenow inoculation on its growth. N2-fixation and yield of rice (Oryza sativa L.). In both seasons the delay in Azolla inoculation decreased the fresh weight (l4.0- 47.5%) and nitrogen yield (15.4 - 48.4%) of Azolla as well as the grain (6.1- 20.3%) and straw (6.4 - 22.7%) yields of rice. An increase in the amount of Azoll inoculum significantly increased these attributes, irrespective of the date of inoculation. Azolla inoculated a week after transplanting gave greater biomass and nitrogen yield than that inoculated 3 and 5 weeks after transplanting. The fresh weight and N yield of Azolla were higher (13.7--103.8%) with inoculums of 2.0 tonnes/ha than with that up to 1.0 tonne/ha in the wet season and 15 tones/ha in the dry season. The use of higher inoculum levels was more advantageous under late-inoculation situation. T he grain and straw yields of rice were the highest when Azolla was inoculated 1 week after transplanting and lowest when it was inoculated 5 weeks after transplanting. The former recorded more panicles/m2 than that inoculated 3 and 5 weeks after transplanting. Inoculation at 5 week after transplanting also reduced the grains/panicle.
 
Publisher The Indian Journal of Agricultural Sciences
 
Contributor —
 
Date 2012-05-21
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
 
Format application/pdf
 
Identifier http://epubs.icar.org.in/ejournal/index.php/IJAgS/article/view/17948
 
Source The Indian Journal of Agricultural Sciences; Vol 65, No 1 (1995)
0019-5022
 
Language eng
 
Relation http://epubs.icar.org.in/ejournal/index.php/IJAgS/article/view/17948/8610
 
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