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NIGERIAN JOURNAL OF SOIL AND ENVIRONMENTAL RESEARCH

Year: 2018|   Volume No: 17|   ISSN: 1595-61-21|   Page No: 


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Title:  Influence of Phosphorus Fertilization and Arbuscular Mycorrhizal Inoculation on Microbial Biomass in the Rhizosphere Soil of Cassava in Two Savannas of Nigeria
Aliyu, * I. A. and Yusuf, A. A.

DEPARTMENT OF SOIL SCIENCE /INSTITUTE FOR AGRICULTURAL RESEARCH, AHMADU BELLO UNIVERSITY, ZARIA

ABSTRACT

Soil microbial biomass influences the decomposition of organic materials,and therefore,is a repository of nutrientsin agroecosystems. An experiment was carried out to investigate the effect of P fertilization and arbuscular mycorrhizal fungal (AMF) inoculation on the soil microbial biomass C (SMBC), N (SMBN) and P (SMBP) in the rhizosphere of cassava grown in two savannas of Nigeria: Northern Guinea (Samaru) and Sudan (Minjibir). Rhizosphere soils were sampled from experiment involving cassava laid in a split plot arrangements with three (3) phosphorus levels as main plots (0, 17.5, and 1 35 kg P O ha ) and three (3) arbuscular mycorrhizal fungi inoculants levels as subplots (Control, Glomygeland 2 5 Mycodrip).The results showed that there was significant difference (p<0.05) between the two sites in SMBCand SMBN with magnitude of 38% and 60% respectively; Samaru site being higher. Application of P fertilizer in Samaru site 1 increased microbial biomass significantly higher than kg P O ha . Likewise, inoculation with arbuscular mycorrhizal 2 5 fungal inoculants in Samaru revealed significant increase in soil microbial biomass C and N. Percentage increases in SMBC as a result of inoculation with Glomygel and Mycodrip over Control were 61% and 63% respectively. Contrarily, no difference in soil microbial biomass C, N and P were recorded at Minjibir. This was attributed to the differences on the soil properties that exist between the sites. It was concluded that application of Pand AMF could increase the soil microbial biomass. However, climatic and edaphic factors play important role on soil microbial biomass.

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