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首页> 外文期刊>Turkish Journal of Agriculture & Forestry >Effects of low-molecular-weight organic acids on phosph sorption characteristics in some calcareous soils
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Effects of low-molecular-weight organic acids on phosph sorption characteristics in some calcareous soils

机译：低分子量有机酸对某些石灰性土壤磷吸附特性的影响

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摘要

Understanding the role of organic acids in phosphorus sorption in soils is very important for economic and environmentally friendly management of soil P. Thus, calcareous surface soils (0-30 cm) from West Azerbaijan Province, Iran, were sampled to study the effect of different organic acids on P sorption. Soil samples (2.5 g) were equilibrated with 25 mL of 0.01 M CaCl2 solution containing 0-20 mg P L"1 and 5 mmol L"1 of different organic acids (citric, oxalic, and malic acid). The sorption data werewell fitted to Freundlich and linear equations but not to the Langmuir equation. The standard P requirements (SPRs) were lower in soils treated with organic acids than in untreated soils. The minimum and maximum values of calculated parameters (extent of sorption, energy of sorption, equilibrium buffering capacity, equilibrium P concentration, and SPR) by Freundlich and linear sorption isotherms were observed in soil 5 (sandy) and soil 4 (clayey-calcareous), respectively. Generally, organic acids decreased the amount of sorbed P and other sorption parameters in the studied soils. Oxalic acid was the most effective reagent for reducing the P sorption.
机译：理解有机酸在土壤中磷吸收中的作用对于土壤P的经济和环境友好管理非常重要。因此，对伊朗西部阿塞拜疆省的钙质表层土壤（0-30厘米）进行了取样研究，研究了不同土壤对磷的影响。有机酸对磷的吸附。土壤样品（2.5 g）用25 mL的0.01 M CaCl2溶液平衡，该溶液包含0-20 mg P L“ 1和5 mmol L” 1的不同有机酸（柠檬酸，草酸和苹果酸）。吸附数据与Freundlich和线性方程式拟合得很好，但与Langmuir方程拟合得很好。用有机酸处理过的土壤中的标准P要求（SPR）低于未处理过的土壤。在土壤5（沙质）和土壤4（粘土-钙质）中观察到通过Freundlich和线性吸附等温线计算的参数（吸附程度，吸附能量，平衡缓冲能力，平衡P浓度和SPR）的最小值和最大值。 ， 分别。通常，有机酸会降低土壤中磷的吸附量和其他吸附参数。草酸是减少P吸附最有效的试剂。

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