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International Journal of Soil Science
  Year: 2017 | Volume: 12 | Issue: 3 | Page No.: 97-103
DOI: 10.3923/ijss.2017.97.103
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Changes in Phosphorus Turnover and Microbial Communities of Two Kenyan Soils

Lydie-Stella Koutika , George Ayaga and Philip Brookes

Background and Objective: Phosphorus (P) deficiency is mainly due to P occlusion in the iron and aluminum oxides in the highly weathered soils of many African countries. The objective of the study was to evaluate the impact of combined manure and inorganic fertilizer on soil P availability for plant uptake, enhanced soil microorganism activity and improved crop yields. Materials and Methods: To test whether increasing microbial biomass protects immobilized phosphorus from fixation and ultimately increases P availability to plants, 33P turnover 63 days and DNA concentrations were measured using the Multi terminal restriction fragment length polymorphism procedure in the two Kenyan soils (high and low P fixing soil) with 4 treatments: (1) control, (2) + Farmyard manure (FYM) (10g kg–1), (3)+ Superphosphate (g kg–1) and 33Phosphorus and (4) FYM+superphosphate (g kg–1) and 33Phosphorus. The one-way analysis of variance (ANOVA) was conducted on different treatments of both studied soils to evaluate 33P turnover and difference in DNA concentrations. Results: The 33P specific activity of Soil Microbial Biomass P (SMB-P) was much higher in the high P fixing soil (KH2PO4 and FYM+KH2PO4) than in the low P fixing soil at Day 21 and 63, showing an enhanced 33P turnover. DNA concentrations were higher in the low P fixing soil (>14 ng μL–1) relative to the high P fixing soil (<10 ng μL–1) at 63 days suggesting the difference in the microbial groups of the two studied soils. Combination of KH2PO4 and FYM benefited to P turnover and DNA concentrations of the high fixing Kenyan soil. Conclusions: This study highlighted the useful effects of combining manure with inorganic fertilizer to both reduce P adsorption and increase P availability i.e., improve soil fertility, to increase crop growth and yields in weathered soils.
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How to cite this article:

Lydie-Stella Koutika, George Ayaga and Philip Brookes, 2017. Changes in Phosphorus Turnover and Microbial Communities of Two Kenyan Soils. International Journal of Soil Science, 12: 97-103.

DOI: 10.3923/ijss.2017.97.103






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