인산질비료 장기연용 논토양에서 유효인산 변동
Change in Available Phosphate by Application of Phosphate Fertilizer in Long-term Fertilization Experiment for Paddy Soil
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초록
BACKGROUND: Phosphorus(P) is a vital factor for rice but excess input of phosphorus fertilizer can cause environmental risk and waste of fertilizer resources. We studied to assess the change of available phosphate, P balance, critical concentration of available phosphate under a rice single system. METHODS AND RESULTS: The changes of available phosphate of paddy soil were examined from long-term fertilization experiment which was started in 1954 at the National Academy ofAgricultural Science. The treatments were no phosphate fertilization(No fert., andN), phosphate fertilization(NPK, NPKC, and NPKCLS). The available phosphorus concentrations in treatmentswithout phosphate fertilizer (No fert. andN)were decreased continuously. But, after 47 years, available phosphate content in phosphate fertilizer treatment (NPK,NPKC, andNPKCLS) reached at the highest (245~331 mg kg-1), showing a tendency to decrease afterward. The mean annual P field balance in these treatments (NPK,NPKC, andNPKCLS) had positive values that varied from16.6 to 17.5 kg ha-1 year-1, and ratio of residual P were increased. These showed that phosphate fertilizer in soil were converted into the form of residual phosphorus which was not easily extracted by available phosphate extractant. Also, Itwas estimated that the critical value of available phosphate for rice cultivationwas 120mg kg-1 using Cate-Nelson equation. CONCLUSION: We concluded that no more phosphate fertilizer should be applied in rice single system if soil available phosphate is higher than the critical P value.
Abstract
BACKGROUND: Phosphorus(P) is a vital factor for rice but excess input of phosphorus fertilizer can cause environmental risk and waste of fertilizer resources. We studied to assess the change of available phosphate, P balance, critical concentration of available phosphate under a rice single system. METHODS AND RESULTS: The changes of available phosphate of paddy soil were examined from long-term fertilization experiment which was started in 1954 at the National Academy ofAgricultural Science. The treatments were no phosphate fertilization(No fert., andN), phosphate fertilization(NPK, NPKC, and NPKCLS). The available phosphorus concentrations in treatmentswithout phosphate fertilizer (No fert. andN)were decreased continuously. But, after 47 years, available phosphate content in phosphate fertilizer treatment (NPK,NPKC, andNPKCLS) reached at the highest (245~331 mg kg-1), showing a tendency to decrease afterward. The mean annual P field balance in these treatments (NPK,NPKC, andNPKCLS) had positive values that varied from16.6 to 17.5 kg ha-1 year-1, and ratio of residual P were increased. These showed that phosphate fertilizer in soil were converted into the form of residual phosphorus which was not easily extracted by available phosphate extractant. Also, Itwas estimated that the critical value of available phosphate for rice cultivationwas 120mg kg-1 using Cate-Nelson equation. CONCLUSION: We concluded that no more phosphate fertilizer should be applied in rice single system if soil available phosphate is higher than the critical P value.
참고문헌 (12)
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