Field response of groundnut (Arachis hypogea L.) cultivars to mycorrhizal inoculation and phosphorus fertilizer in Abeokuta, South West Nigeria

Atayese, M.O. (2007) Field response of groundnut (Arachis hypogea L.) cultivars to mycorrhizal inoculation and phosphorus fertilizer in Abeokuta, South West Nigeria. American-Eurasian Journal of Agricultural and Environmental Science, 2 (1). pp. 16-23.

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A field experiment was conducted in Abeokuta, south western Nigeria, to evaluate the growth and yield response of three groundnut cultivars to inoculation with mycorrhizal fungus (Glomus mosseae) and phosphorus (P) fertilization in 2003 and 2004 planting seasons. The design was split-split plot in Randomized Complete Block Design (RCBD) in a 3×2×2 factorial combination of groundnut cultivars (RMP91, RRB and RMP12), phosphorus (54 and 0 kg ha-1) and mycorrhizal inoculation (inoculated and uninoculated). Observations were made on canopy spread, leaf area, dry matter yield and grain yield. Mycorrhizal root infections, leaf P uptake and available P in the rhizosphere were also determined. Result shows that inoculation of groundnut cultivars with G. mosseae significantly enhanced grain yield in the 2003 planting season (54% in RMP91 to 66% in RMP12) whereas the enhancement was lower and only significant in RRB (21%) in the 2004 planting season. Phosphorus fertilization enhanced grain yield by a range of 22% (RMP91) and 40% (RMP12) in the 2003 planting season while it was a range of between 20% (RMP91) and 16% (RRP) in the 2004 planting season. Mycorrhizal root infection was as high as 64.1% relative to control (10.6%) in 2003 season. Inoculation with G. mosseae increased leaf P uptake by 30% within the two planting seasons. Phosphorus application increased the level of P in the leaf (average 32%) in the two years and rhizosphere soil P (average 1400%) only in the 2004 planting season. Percentage root colonization ranged between 60 and 67% in all the inoculated plots in the two years. There was a marked increased in the root infection rate in the uninoculated plots (averaged 180%) in the 2004 planting season. In the 2004 planting season, available rhizosphere soil P averaged 2.06 mg kg-1 in the inoculated plots when compared to 2.6 mg kg-1 in P fertilized and 2.69 mg kg-1 in the P+M plots. All the treatments increased canopy spread (average 25%), leaf area (average 14%) and root dry weight (17%) over the control in the 2003 planting season, while in 2004 planting season, increase was recorded in canopy spread (average 22%), leaf area (average 40%) and shoot dry weight (average 35%) over the control. Inoculation of groundnut cultivars with the mycorrhizal fungus improved their performance in the field and compared favorably with the groundnuts fertilized with 54 kg ha-1 of SSP fertilizer

Item Type: Article
Author Affiliation: Department of Plant Physiology and Crop Production, University of Agriculture, Abeokuta, Nigeria.
Subjects: Plant Production
Plant Protection > Pests
Divisions: Groundnut
Depositing User: Mr T L Gautham
Date Deposited: 06 Jan 2011 22:58
Last Modified: 06 Jan 2011 22:58
Official URL:

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