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首页> 外文期刊>Turkish Journal of Agriculture & Forestry >Potassium Exchange Isotherms as a Plant Availability Index in Selected Calcareous Soils of Western Azarbaijan Province, Iran
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Potassium Exchange Isotherms as a Plant Availability Index in Selected Calcareous Soils of Western Azarbaijan Province, Iran

机译：钾交换等温线作为伊朗阿塞拜疆西部某些钙质土壤中植物有效性的指标

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Potassium (K) exchange isotherms (quantity-intensity technique, Q/I) and K values derived from the Q-I relationship provide information about soil K availability. This investigation was conducted to study the relationships among K Q/I parameters, available K extracted by 1 N NH4AOc (exchangeable K plus solution K), potassium saturation percentage (K-index, %), and the properties of 6 different calcareous agricultural soils. In addition, the relationship of tomato plant yield response to the K requirement test based on K exchange isotherms was investigated. The Q/I parameters included readily exchangeable K (DK0), specific K sites (KX), linear potential buffering capacity (PBCK), and energy of exchange of K (EK). The results of X-ray diffraction analysis of the oriented clay fractions indicated that some mixed clay mineral, some chlorite/illite clay minerals, along with palygorskite and kaolinite were present in the soils. The soil solution K activity ratio at equilibrium (AR0) ranged from 0.0014 to 0.028 (moles l-1)0.5. The readily exchangeable K (DK0) was between 0.044 and 2.5 (cmolc kg-1 soil), which represented an average of 51% of the exchangeable K (Kex). There was a significantly positive relationship between DK0 and NH4AOc-extractable K (r = 98, P < 0.001). The soils showed high capacities to maintain the potential of K against depletion, as they represented very high linear potential buffering capacities (PBCK) [44-177 cmol kg-1/(mol l-1)0.5. The EK values for the check treatments ranged from -2736 to -4117 calories M-1, and, for the treatments in which 120 mg K l-1 was added, varied between -2193 and -2657 calories M-1. The percentage of K saturation (K-index, %) ranged from 3.8% to 10.2%. Analysis of variance of the dry matter (DM), K concentrations, and K uptake of tomato plants indicated that there were no significant differences (P < 0.05) among the adjusted levels of K as determined by the exchange-isotherm curve.
机译：钾（K）交换等温线（量强度技术，Q / I）和从Q-I关系得出的K值可提供有关土壤钾有效性的信息。进行这项研究以研究K Q / I参数，1 N NH4AOc提取的可用K（可交换K加溶液K），钾饱和度百分比（K指数，％）以及6种不同钙质农业土壤的特性之间的关系。此外，研究了番茄植物产量响应与基于钾交换等温线的钾需求量试验之间的关系。 Q / I参数包括易于交换的K（DK0），特定的K位点（KX），线性电势缓冲容量（PBCK）和K的交换能量（EK）。定向粘土组分的X射线衍射分析结果表明，土壤中存在一些混合粘土矿物，一些绿泥石/伊利石粘土矿物以及坡缕石和高岭石。平衡时的土壤溶液K活度比（AR0）为0.0014至0.028（摩尔-1）0.5。易交换的K（DK0）在0.044和2.5（cmolc kg-1土壤）之间，平均代表可交换K（Kex）的51％。 DK0和NH4AOc可提取的K之间存在显着正相关（r = 98，P <0.001）。土壤表现出很高的保持钾抗枯竭潜力的能力，因为它们表现出非常高的线性势能缓冲能力（PBCK）[44-177 cmol kg-1 /（mol l-1）0.5。检查处理的EK值介于-2736至-4117卡路里M-1之间，对于添加120 mg K l-1的处理，其EK值介于-2193和-2657卡路里M-1之间。钾饱和度的百分比（K指数，％）为3.8％至10.2％。番茄植株干物质（DM），钾浓度和钾吸收的方差分析表明，根据交换等温线曲线确定，调整后的钾水平之间没有显着差异（P <0.05）。

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