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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Predicting Phosphorus Buffer Coefficients of Representative Maize Soils in Laos) ผู้เขียน: ชัยสถิตย์ สุริยวงศ์ษา,  ดร.ทัศนีย์ อัตตะนันทน์, ศาสตราจารย์ , Russell Yost สื่อสิ่งพิมพ์:pdf AbstractMaize is an important crop in the Lao Peoples Democratic Republic (Laos) with as much as 113,808 ha grown in 2006. Recent research indicates that nearly all soils growing maize are deficient in phosphorus. In order to quantify the phosphorus requirement using the phosphorus decision support system (PDSS), the most important factor in the PDSS algorithm is the phosphorus buffer coefficient (PBC), which reflects the reaction of the soil to P fertilizer. The PBC was studied in 15 upland soils using the Bray 2 (PBCBray 2) and Mehlich 1 (PBCMehlich 1) methods and the iron oxide impregnated filter paper or Pi test (PBC Pi test) procedure. Multiple regression analysis was used to quantify the relationship between the PBC and some soil properties involved in the P-sorption process. The PBCBray 2 and PBCMehlich1 results were significantly correlated at the 0.01 levoerlg wanitihc carbon and iron having an adjusted R2 of 0.79 and 0.86 determined by the citrate bicarbonate dithionite method and the amount of clay, respectively. Unlike the two chemical extractions, the PBCPi test result was significantly correlated at the 0.01 level with aluminum (determined by the method using ammonium oxalate at pH 3 in darkness), the percent clay and organic carbon with an adjusted R2 of 0.80. However, the study suggested that the PBC should be estimated by the Mehlich 1 method, so that the model could more accurately predict the PBC. |
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 Researcherนาย อรรถศิษฐ์ วงศ์มณีโรจน์, ผู้ช่วยศาสตราจารย์ที่ทำงาน:ภาควิชาปฐพีวิทยา คณะเกษตร กำแพงแสน สาขาที่สนใจ:ความอุดมสมบูรณ์ของดิน-ปุ๋ย, การใช้ปุ๋ย, การวิเคราะห์ดินและพืช, ระบบสารสนเทศทางภูมิศาสตร์, การใช้แบบจำลองในการผลิตพืช, การวิเคราะห์ดินพืช ปุ๋ยและความอุดมสมบูรณ์ของดิน Resume |
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หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Predicting Phosphorus Buffer Coefficients of Some Representative Soils for Maize Production in Lao PDR by Three Soil Analysis Methods) ผู้เขียน:ครปานี ดุ่นนาดี, ดร.ทัศนีย์ อัตตะนันทน์, ศาสตราจารย์, Russell Yost สื่อสิ่งพิมพ์:pdf AbstractPhosphorus buffer coefficient (PBC) is one of the important factors in the phosphorus fertilizer recommendation prediction by the use of Phosphorus Decision Support System (PDSS) program. A study on PBC of 7 representative maize soils in Laos and one Thai soil was conducted. The PBC determination was done by mixing the soils with potassium dihydrogen phosphate (KH2PO4) at the rates of 0, 25, 50, 100 and 200 mg P kg-1. All soil samples were kept in the incubator at 30 ?C for two weeks. The extractable P was analyzed by three methods: Bray-2, Mehlich-1 and iron oxide-impregnated filter paper method or Pi-test. The results showed different PBC values of soils with different extractants. Multiple regression analysis was used to determine the relationship between the PBC and soil properties. It revealed that PBCBray-2 was correlated with percentage of clay content with adjR2=0.64 and PBCPi-test was correlated with percentage of clay content and ammonium oxalate extractable aluminum, with adjR2 =0.89. The soil properties were substituted in the two models to predict the PBCBray-2 and PBCPitest, respectively. The predicted PBC was plotted against observed PBC to compare the prediction accuracy using soil properties by 1:1 line relationship. The result showed that the PBC should be estimated by Pitest for more accurate PBC prediction. |
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ผลงานตีพิมพ์ในวารสารวิชาการImproving multi-soil-layer (MSL) system remediation of dairy effluentผู้แต่ง:Pattnaik, R, Yost, RS, Porter, G, Masunaga, T, Dr.Tasnee Attanandana, Professor, วารสาร:   
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ผลงานตีพิมพ์ในวารสารวิชาการPhosphorus-Sorption Characteristics and Phosphorus Buffer Coefficients of Some Important Soils in Lao PDRผู้แต่ง:Souliyavongsa, Xaysathid, Yampracha, Sukunya, Dr.Tasnee Attanandana, Professor, Yost, Russell, Kanghae, Piboon, วารสาร: |
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ผลงานตีพิมพ์ในวารสารวิชาการSite-specific Nutrient Management of Irrigated Rice in the Central Plain of Thailandผู้แต่ง:Dr.Tasnee Attanandana, Professor, Kongton, S, Boonsompopphan, B, Polwatana, A, Verapatananirund, P, Yost, R, วารสาร: |