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首页> 外文期刊>Communications in Soil Science and Plant Analysis >Evaluation of Modified Mehlich and Sikora Buffer Methods as an Alternative to Modified Woodruff Buffer in Determining Lime Requirement for Missouri Soils
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Evaluation of Modified Mehlich and Sikora Buffer Methods as an Alternative to Modified Woodruff Buffer in Determining Lime Requirement for Missouri Soils

机译：评估改良的Mehlich和Sikora缓冲液方法作为改良的伍德拉夫缓冲液的替代方法，以确定密苏里州土壤的石灰需求

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The modified Woodruff buffer (MWB) test is used to determine lime requirement (LR) for Missouri soils. Though this method is proven to work for Missouri soils, it uses p-nitrophenol, which is a hazardous substance. Soil-testing laboratories are under increasing pressure to reduce hazardous wastes, which must be collected and disposed of following U.S. Environmental Protection Agency protocols. The goal of this study was to evaluate the modified Mehlich buffer (MMB) and the Sikora buffer (SB) as alternatives to the MWB in determining the LR for Missouri soils. Thirty soils were collected from major agricultural areas in Missouri, treated with calcium carbonate (CaCO3), and incubated for 90 days. Soil pHs [0.01 M calcium chloride (CaCl2) 1:1] was regressed against CaCO3 rate, and the actual LR was estimated for each soil to raise the soil pHs to target levels of 5.8, 6.3, and 6.8. The MWB, MMB, and SB pHs were regressed against the actual LR for all 30 soils to evaluate the effectiveness of each test for estimating the LR. The MMB and SBs were found to be as good as or better than MWB in predicting LR in Missouri soils. Both buffers (MMB and SB) were found to be equally effective in generating accurate estimates of the LR to raise soils to pHS 5.8, 6.3, and 6.8 (for pH values 5.8: R2 = 0.76, 0.82, 0.81; for pH values 6.3: R2 = 0.80, 0.88, 0.86; and pH values 6.8: R2 = 0.77, 0.89, 0.87 for MWB, MMB, and SB, respectively). A test to evaluate the stability of the buffers over time indicated that MMB had the shortest bench life (about 21 days) when compared to the MWB and SB, thus making it less feasible for use by soil test laboratories. Based on performance and stability, SB is a better alternative than MWB for Missouri soils.View full textDownload full textKeywordsLime requirement, Mehlich buffer, Sikora buffer, Woodruff bufferRelated var addthis_config = { ui_cobrand: "Taylor & Francis Online", services_compact: "citeulike,netvibes,twitter,technorati,delicious,linkedin,facebook,stumbleupon,digg,google,more", pubid: "ra-4dff56cd6bb1830b" }; Add to shortlist Link Permalink http://dx.doi.org/10.1080/00103624.2012.641843
机译：改良的伍德拉夫缓冲液（MWB）测试用于确定密苏里州土壤的石灰需求（LR）。尽管已证明该方法适用于密苏里州的土壤，但它使用对硝基苯酚，这是一种有害物质。减少土壤测试实验室的压力越来越大，以减少危险废物，必须按照美国环境保护署的规程收集和处置这些废物。这项研究的目的是评估改良的Mehlich缓冲液（MMB）和Sikora缓冲液（SB）作为MWB的替代方法，以确定密苏里州土壤的LR。从密苏里州的主要农业地区收集了三十种土壤，用碳酸钙（CaCO 3 ）处理，并孵育了90天。将土壤pH s [0.01 M氯化钙（CaCl 2 ）1：1]相对于CaCO 3 的速率进行回归，并估算实际LR将每种土壤的pH s 提高到5.8、6.3和6.8的目标水平。针对所有30种土壤，将MWB，MMB和SB pH值相对于实际LR进行回归，以评估每次评估LR的有效性。发现MMB和SB在预测密苏里州土壤的LR方面与MWB相同或更好。发现两种缓冲液（MMB和SB）在生成LR的准确估计值以将土壤升高至pH S 5.8、6.3和6.8（对于pH值5.8：R 2）方面均有效。 = 0.76，0.82，0.81;对于pH值6.3：R 2 = 0.80，0.88，0.86;对于pH值6.8：R 2 = 0.77，0.89 ，分别为MWB，MMB和SB的0.87）。评估缓冲液随时间变化的稳定性的测试表明，与MWB和SB相比，MMB的工作台寿命最短（约21天），因此使土壤测试实验室更不可行。基于性能和稳定性，对于密苏里州的土壤来说，SB比MWB更好。 netvibes，推特，technorati，可口，linkedin，facebook，stumbleupon，digg，google，更多”，发布：“ ra-4dff56cd6bb1830b”};添加到候选列表链接永久链接http://dx.doi.org/10.1080/00103624.2012.641843

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