Effects of goat manure and inorganic phosphate addition on soil inorganic and microbial biomass phosphorus fractions under laboratory incubation conditions(Fertilizers and Soil Amendments)

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概要

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• Changes in inorganic phosphorus (P) and soil microbial biomass P following the addition of goat manure and different amounts of inorganic P to an Umbric Ferralsol were assessed over 12 weeks under laboratory incubation conditions using a sequential fractionation procedure. Triple superphosphate was added at rates equivalent to 0, 45, 90, 135 and 180mg P kg^<-1>, with or without goat manure at a rate of 10g kg^<-1> soil on a dry-weight basis and incubated moist. Resin P, 0.5mol L^<-1> NaHCO_3 extractable inorganic P (NaHCO_3-P_i), 0.1mol L^<-1> NaOH extractable inorganic P (NaOH P_i) and soil microbial biomass P concentrations were determined on days 7, 14, 28, 56 and 84. The magnitudes of the inorganic P fractions extracted were: NaOH P_i>Resin P>NaHCO_3 P_i. Thus, NaOH P_i was the major sink for the applied P. The dynamics of the three labile P fractions (resin P, NaHCO_3 P_i and microbial biomass P) varied considerably during the incubation period. The resin P fraction consistently declined with time in all treatments, whereas the NaHCO_3 P_i fraction changed little with time in the control and goat manure amended soil, but increased rapidly with time when inorganic P was applied alone or in combination with goat manure. Microbial biomass P increased with time in all treatments, peaking on day 28 and declining thereafter. The co-application of inorganic P with goat manure produced up to twofold more microbial biomass P than either inorganic P or goat manure applied alone. Therefore, the combined application of manure with low rates of P fertilizers may be a cost effective strategy for increasing the efficiency of fertilizer P use through enhanced biological cycling of P in small-holder farms in South Africa.

著者

• GICHANGI Elias

  Department of Agronomy, University of Fort Hare

• MNKENI Pearson

  Department of Agronomy, University of Fort Hare

• BROOKES Philip

  Department of Soil Science, Rothamsted Research

• Mnkeni Pearson

  Department Of Agronomy University Of Fort Hare

• Gichangi Elias

  Department Of Agronomy University Of Fort Hare:(present Office)kenya Agricultural Research Institute

• Brookes Philip

  Department Of Soil Science Rothamsted Research

• Gichangi Elias

  Department Of Agronomy University Of Fort Hare

• Mnkeni Pearson

  Univ. Fort Hare Alice Zaf

関連論文

• Effects of goat manure and inorganic phosphate addition on soil inorganic and microbial biomass phosphorus fractions under laboratory incubation conditions
• Effects of goat manure and inorganic phosphate addition on soil inorganic and microbial biomass phosphorus fractions under laboratory incubation conditions(Fertilizers and Soil Amendments)
• Effects of cyanobacteria strains selected for their bioconditioning and biofertilization potential on maize dry matter and soil nitrogen status in a South African soil(Soil Biology)
• Goat manure application improves phosphate fertilizer effectiveness through enhanced biological cycling of phosphorus(Fertilizer and Soil Amendments)

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