 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Status of B, Cu, Fe, Mo and Zn of Soils of Ethiopia for Maize Production: Greenhouse Assessment) ผู้เขียน: Teklu Baissa,  ดร.อำนาจ สุวรรณฤทธิ์, ศาสตราจารย์เกียรติคุณ , นายยงยุทธ โอสถสภา, รองศาสตราจารย์ , ดร.เอ็จ สโรบล, ศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractA greenhouse experiment using omission technique was conducted to evaluate the status of Fe, Cu, Zn, B and Mo in some Nitisols of Western Ethiopia and Rift Valley Andisols for maize production in order to confirm the results of the laboratory study. For each nutrient under study, a randomized complete block design with five treatments and four replications was employed. The treatments were: (1) control, no nutrient application; (2) application with low rates of all nutrients; (3) application with medium rates of all nutrients; (4) application with high rates of all nutrients; and (5) application with medium rates of all nutrients except the micronutrients under study. Considering the results of the present experiment and those in the previous laboratory assessment the following conclusions were drawn. Fe status of all of the Andisol was in the sufficient range whereas about 1.9% of the Nitisols was in the deficient range for maize production. The results of the present study did not support the critical level of 4.8 mg Fe kg-1 by AB-DTPA method reported by other authors. The results on of this experiment showed that the critical levels were lower than 4.56 mg Fe kg-1 in the case of Andisols and higher than 5.20 mg Fe kg-1 in the case of Nitisols. Cu status of all of the Andisols was in the deficient range whereas that of 5.6% of the Nitisols was in the deficient range for maize production. Zn status of all of the Nitisols was in the deficient range whereas that of all of the Andisols was in the sufficient range. B status of 31.9% of the Nitisols was in the deficient range whereas that of all of the Andisols was in the sufficient range. Mo status of all of the Andisols was in the sufficient range whereas that of 4.4% of the Nitisol was in the deficient range. The present results supported the critical levels for Cu, Zn, B and Mo found in the literature. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Status of Mn, Fe, Cu, Zn, B and Mo in Rift Valley Soils of Ethiopia: Laboratory Assessment) ผู้เขียน:Teklu Baissa, ดร.อำนาจ สุวรรณฤทธิ์, ศาสตราจารย์เกียรติคุณ, นายยงยุทธ โอสถสภา, รองศาสตราจารย์, ดร.เอ็จ สโรบล, ศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractForty soil samples at a depth of 0-15 cm were collected from Andisols of Ethiopian Rift Valley following two moisture regimes and two farming practices. The objectives of the study were to assess the status of manganese (Mn), iron (Fe), copper (Cu), zinc (Zn), boron (B) and molybdenum (Mo) in the soils and to examine effects of moisture and farming practices on the nutrients. The status of Mn, Fe, Cu and Zn were determined using diethylene triamine pentaacetic acid-triethanolamine (DTPA-TEA), ammonium bicarbonate diethylene triamine pentaacetic acid (AB-DTPA) and Mehlich III methods using atomic absorption spectrophotometer. Boron was analyzed by hot water extraction method and Mo by ammonium acetate etheline diamine tretaacitic acid (EDTA) extraction method using spectrophotometer. The status of Mn, Zn and B were in the sufficient range in all of the samples. The status of Fe and Mo were in the sufficient ranges, except for 7.5% and 40% of the samples, respectively. In Vitric Andisols the status of Cu in all the samples were in the deficient ranges in traditional farms using DTPA-TEA
method, while the samples were in sufficient ranges using AB-DTPA and Mehlich III methods in intensive farms. In Mollic Andisols the status of copper of most of the samples in both farming practices were in the deficient range. The status of Mn was mostly higher in traditional farms than in intensive farms in Vitric and Mollic Andisols. In Vitric Andisols the contents of Fe, Cu, Zn, B and Mo were higher in intensive farms than in traditional farms. In Mollic Andisols the contents of Fe, Cu and Zn were higher in traditional farms than in intensive ones, while B and Mo were higher in intensive farms than in traditional farms. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Status of Cu, Zn, B and Mo in Agricultural Soils of Western Ethiopia: Laboratory Assessment) ผู้เขียน:Teklu Baissa, ดร.อำนาจ สุวรรณฤทธิ์, ศาสตราจารย์เกียรติคุณ, นายยงยุทธ โอสถสภา, รองศาสตราจารย์, ดร.เอ็จ สโรบล, ศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractOne hundred and sixty soil samples of Nitisols of Western Ethiopia were collected following three elevational positions and two farming practices. The objectives of the study were to assess the status of copper, zinc, boron and molybdenum in the soils and to examine effects of altitude and farming practices on status of the nutrients. The status of copper and zinc were determined by diethylene triamine pentaacetic acid-triethanolamine (DTPA-TEA), ammonium bicarbonate diethylene triamine pentaacetic acid (AB-DTPA) and Mehlich-III methods using atomic absorption spectrophotometer. Boron was analyzed by hot water extraction method and molybdenum by ammonium acetate EDTA extraction method using spectrophotometer. The contents of extractable copper were in the sufficient ranges by DTPA-TEA and AB-DTPA methods. However, by Mehlich-III method the amounts of extractable copper of 18, 3.6 and 1.8% of the samples were below the critical level in low, mid and high altitudes, respectively. The contents of extractable Zn were all in the deficient ranges in low and mid altitudes by DTPA-TEA and Mehlich-III methods. However, by AB-DTPA method, the contents of 72 and 51% of the samples were below critical level in low and mid altitudes, respectively. The contents of extractable Zn were in the deficient range in high altitude by 73, 9 and 71% of the samples using DTPA-TEA, ABDTPA and Mehlich-III, respectively. The contents of extractable boron in 30, 38 and 27% of the samples and the contents of molybdenum in 6, 2 and 6% of the samples were in the deficient range in low, mid and high altitudes, respectively. The contents of copper were higher in traditional farms than in intensive farms in low altitude, while the contents were mostly higher in intensive farms than in traditional farms in mid and high altitudes. The amounts of extractable zinc were higher in intensive farms than traditional farms. The values of extractable boron and extractable molybdenum mostly were higher in traditional farms than in intensive farms in all altitudes. The amounts of copper and zinc by Mehlich-III and AB-DTPA methods increased with increase in altitudes. Boron and molybdenum did not show consistency in the effects of altitudes. Key words: altitude, copper, zinc, boron, molybdenum |
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หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Status of Mn and Fe in Agricultural Soils of Western Ethiopia: Laboratory Assessment) ผู้เขียน:Teklu Baissa, ดร.อำนาจ สุวรรณฤทธิ์, ศาสตราจารย์เกียรติคุณ, นายยงยุทธ โอสถสภา, รองศาสตราจารย์, ดร.เอ็จ สโรบล, ศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractOne hundred and sixty soil samples at depth of 0-15 cm were collected from Nitisols of Western Ethiopia following three elevational positions (low, mid and high altitudes) at 1300, 1800 and 2300 masl, respectively, and two farming practices (traditional and intensive). The objectives of the study were to assess the status of manganese and iron in Nitisols and examine effects of altitude and farming practices on the status. The status was determined using diethylene triamine pentaacetic acid-triethanolamine (DTPA-TEA), ammonium bicarbonate diethylene triamine pentaacetic acid (AB-DTPA) and Mehlich III methods using atomic absorption spectrophotometer. There were no textural variation among all samples and all the samples were classified in the clay textural class. The pH measured in water varied between 4.24-6.21. Sixty four percent and fourteen percent of the samples were low in available phosphorus and organic carbon, respectively. Comparing the results of extractable manganese and iron in Nitisols of Western Ethiopia with critical levels of manganese and iron from literature, the amounts of extractable manganese and iron were in the sufficient range. The manganese status was higher in traditional farms than in intensive farms in low and high altitudes. In mid altitude, on the other hands, the status of manganese in intensive farms was higher than that in traditional ones. The iron status was mostly higher in traditional farms than in intensive farms in all altitudes. Irrespective of farming practices the status of manganese and iron increased with the increase in altitude. The amounts of manganese were higher than those of iron in all the three altitudes using the three methods. Comparing the extracting power of the methods used for determining manganese and iron, the result of soil analysis showed that DTPA-TEA was superior to the others followed by AB-DTPA and Mehlich II |
 ผลงานตีพิมพ์ในวารสารวิชาการStatus of Mn, Fe, Cu, Zn, B and Mo in Rift Valley Soils of Ethiopia:
Laboratory Assessmentผู้แต่ง:Teklu Baissa, Dr.Amnat Suwanarit, Emeritus Professor, Mr.Yongyuth Osotsapar, Associate Professor, Dr.Ed Sarobol, Professor, วารสาร: |
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