Goat manure application improves phosphate fertilizer effectiveness through enhanced biological cycling of phosphorus(Fertilizer and Soil Amendments)

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概要

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• High phosphate fixation necessitates the application of high rates of phosphorus (P) fertilizers to achieve reasonable crop yields in most tropical soils. The present study investigated the efficacy of goat manure in improving the effectiveness of fertilizer P for increasing maize yields. Treatments consisted of combinations of four rates of goat manure (0, 2.5, 5 and 10gkg^<-1> equivalent to 0, 5, 10 and 20t goat manure ha^<-1>, respectively) and four rates of inorganic P (0, 45, 90 and 180mg P kg^<-1> equivalent to 0, 90, 180 and 360kg P ha^<-1>, respectively) applied to 7kg soil in pots. Maize (Zea maize L.) was sown immediately after application. Maize dry matter yields (maize yield) and the concentrations of resin P, soil microbial biomass P (biomass P), 0.5mol L^<-1> NaHCO_3 extractable inorganic P (NaHCO_3-P_i) and 0.1mol L^<-1> NaOH extractable inorganic P (NaOH-P_i) were determined 6 and 12 weeks after planting. After 12 weeks, maize yield increased with the addition of fertilizer P or goat manure separately and was further increased when they were applied together. These synergistic effects on maize yield were ascribed to enhanced P cycling because goat manure increased the concentration of biomass P, which in turn accounted for most of the observed variations (63%) in maize yield. The combination of biomass P and resin P, however, explained a greater proportion of the variations in maize yield (73%), suggesting that the usefulness of biomass P as an index of P availability would be enhanced if used in conjunction with resin P. These results indicated that goat manure application could be used to increase soil microbial biomass P, which in turn could improve the effectiveness of fertilizer P in the Eastern Cape, 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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