Carbon balance in maize fields under cattle manure application and no-tillage cultivation in Northeast Thailand(Environment)

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概要

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• This study was carried out to analyze the effects of cattle manure application and no-tillage cultivation on changes in soil carbon stock and carbon balance in maize (Zea mays L.) fields in infertile tropical sandy soil in Khon Kaen, Northeast Thailand. The experimental field was treated for 3 years from August 1999 to June 2002 with conventional cultivation, cattle manure application and no-tillage cultivation. Cattle manure was applied at a rate of 20Mgha^<-2> (fresh weight) 5 days before sowing maize. Weeds in the no-tillage cultivation field were sprayed with herbicide and dead weeds were left in the field. Soil was sampled at 0-50cm depth before plowing in the first-third years and 1 year after the third year of the experiment. The CO_2 flux from the soil surface was measured using the alkaline absorption method every 1-4 weeks throughout the period. The biomass of maize and weeds was stable under conventional cultivation, increased with cattle manure application, and decreased with no-tillage cultivation. Soil carbon stock in the 0-30cm soil depth increased from 16.0, 11.0 and 13.3MgCha^<-1> at the start of the experiment to 17.1, 18.2 and 15.9MgCha^<-1> 3 years later in the conventional cultivation, cattle manure application and no-tillage cultivation treatments, respectively. The CO_2 flux from the soil surface of the maize field was 10.1-11.5MgCha^<-1> year^<-1> under conventional cultivation and 8.5-9.4MgCha^<-1> year^<-1> under no-tillage cultivation over the 3 years of the experiment. With cattle manure application, the CO_2 flux was 10.5MgCha^<-1> year^<-1> in the first year, which was not different from the other treatments; this increased to 13.3-15.3MgCha^<-1> year^<-1> in the second and third years. Analysis of the carbon balance showed that the applied cattle manure increased the soil carbon stock and plant biomass, which consequently further increased carbon input to the soil. In the no-tillage cultivation treatment, carbon loss by CO_2 flux from the soil was low, although carbon input to the soil by returning maize residues and weeds was also low; hence, only a small amount of carbon input accumulated in the soil.

• 社団法人日本土壌肥料学会の論文

著者

• Paisancharoen Kobkiet

  Khon Kaen Field Crops Research Center Department Of Agriculture

• Hakamata Tomoyuki

  National Institute for Agro-Environmental Sciences

• Hakamata Tomoyuki

  National Institute Of Agro-environmental Sciences:(present Office)tsukuba Research Laboratory Hamama

• MATSUMOTO Naruo

  Japan International Research Center for Agricultural Sciences

関連論文

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• Carbon balance in maize fields under cattle manure application and no-tillage cultivation in Northeast Thailand(Environment)
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