EFFECT OF PHOSPHORUS ON N_2-FIXATION AS MEASURED BY THE FIELD ACETYLENE REDUCTION TECHNIQUE IN THAILAND LONG-TERM FERTILITY PLOTS
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概要
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An in situ acetylene reduction technique was applied to wetland fields in Thailand to assess the relative contributions of N_2-fixation associated with rice, and algal N_2-fixation.Non-fertilized and PK-fertilized plots were used in long-term fertility trials at three sites with high(Chainat), medium(Supanburi), and low(Klong-luang, acid sulfate soil)soil fertilities.Assays were made at the maximum tillering, heading, and maturing stages during four continuous cropping seasons spanning 2 years. Since the regression coefficients for the logarithm of variance to the logarithm of the mean were close to 2.0,the log normal distribution of the acetylene reduction activity variables could be predicted, and the variables were subjected to logarithmic transformation for statistical calculation. Additions of PK fertilizer affected the rice yields and N_2-fixation associated with rice at Supanburi and Klong-luang, but not those at Chainat.The PK fertilizer affected the algal N_2-fixation at Chainat and Klong-luang, but not that at Supanburi.The algal fixation was lowest in non-fertilized plots at Supanburi(0.36 mmol C_2H_4・m^<-2> per day)and highest in PK-fertilized plots at Chainat and Supanburi(1.7-1.5 mmol C_2H_4・m^<-2> per day).The N_2-fixation associated with rice was lowest in non-fertilized plots at Klong-luang(0.07 mmol C_2H_4・m^<-2> per day)and highest in PK-fertilized plots at Supanburi(0.4 mmol C_2H_4・m^<-2> par day). The reported experiments provide field evidence for enhancement of N_2-fixation by phosphorus fertilizer in plots where rice yields have increased without additions of nitrogen fertilizer.
- 社団法人日本土壌肥料学会の論文
著者
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Watanabe Iwao
The International Rice Research Institute
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Cholitkul Wisit
Department Of Agriculture
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TANGCHAM Bunharn
Department of Agriculture
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SANGTONG Prapit
Department of Agriculture
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