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Glomus–Azotobacter association affects phenology of mango seedlingsunder reduced soil nutrient supply

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Title Glomus–Azotobacter association affects phenology of mango seedlingsunder reduced soil nutrient supply
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Creator Som Dev Sharma
Pramod Kumar
Shailendra Kumar Yadav
 
Subject Arbuscular mycorrhizaGlomus fasciculatumGrowth promotionNurseryReduced N + P inorganic fertilization
 
Description Not Available
The aim of this research was designed to determine the effectiveness of indigenous arbuscular mycor-rhizal (AM) fungal species Glomus fasciculatum (Thaxter sensu Gerdemann), Glomus magnicaulis (Hall)and Azotobacter strains on growth promotion of mango seedlings under limited nitrogen (N) and phos-phorous (P) soil fertilization for sustainable nursery management in rainfed ecosystem. Three districtsin the state of Himachal Pradesh namely, ‘Kangra’, ‘Hamirpur’ and ‘Bilaspur’ being located in the Shiwa-lik hill range of north-western Himalayas of India were selected purposely to measure the intensity ofoccurrence anddistribution of indigenous AM fungal species and A. chroococcum strains in local ‘Dashe-hari’ mango orchards. AM fungi viz., G. fasciculatum (Thaxter sensu Gerdemann), G. magnicaulis (Hall), G.mosseae (Nicol. and Gerd.) and Gigaspora heterogamma (Nicol. and Gerd.), and two strains of A. chroococ-cum viz., AZ1and AZ2were predominant in the rhizosphere soil of the orchards. The data inferred thatAM fungal spore load, root colonization and A. chroococcum bacterial count in different locations rangedfrom 2150–2975 spores kg−1of the moist soil, 8.5–11.8% and 3.1 × 106–4.7 × 106colony forming units(cfu), respectively. Soil type of the orchards varied between sandy loam and clay loam. To assess the com-parative effectiveness of AM species and Azotobacter strains, the inocula were screened alone and in dualcombination at different levels of N and P inorganic fertilizers. The inocula of potent isolates/strains i.e.,Glomus fasciculatum, G. magnicaulis, AZ1and AZ2were multiplied and inoculated under varied N and P fer-tilization in the ratio of 12:4 g kg−1i.e. 2/3 N + P, 3/4 N + P and full N + P. Vegetative development affectedby the mycorrhizal and bacterial inoculation was more pronounced when seedlings were inoculated withG. fasciculatum followed by G. magnicaulis with AZ1and/or AZ2alone, and in dual combination at 2/3 doseof N + P. The inoculation of either of AM fungal species and/or bacterial strains led to a significant increasein plant height, stem diameter, leaf area and total root length in comparison to non-inoculated control,and was also demonstrated with G. fasciculatum and AZ1stimulated maximum growth of the seedlingsin reduced N and P inorganic fertilizer sources. Considering the overall results, G. fasciculatum and AZ1had a greater effect on vegetativegrowth promotion in reduced soil nutrient supply on mango seedlings.
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Date 2020-05-08T10:48:40Z
2020-05-08T10:48:40Z
2014-04-30
 
Type Research Paper
 
Identifier Not Available
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http://krishi.icar.gov.in/jspui/handle/123456789/35481
 
Language English
 
Relation Not Available;
 
Publisher Not Available