Potassium fixation capacity has been estimated in chernozem samples taken from the variants of a field experiment with a single application of potassium fertilizers (0, 70, 140 and 280 kg/ha) after a six-year break in fertilizer use. The potassium fixation capacity of chernozems inferred from the change of exchangeable potassium content after the incubation of the samples with a fixed dose of a potassium fertilizer (50 mg/100 g) ranged from 45 to 47 mg/100 g, or 91–95% of the potassium introduced in the different experimental variants. The actual potassium fixation capacity may be considerably higher than the values measured. Potassium fixation capacity inferred from the change of non-exchangeable potassium content after incubation of the samples with a fixed dose of a potassium fertilizer ranged from 32 to 38 mg/100 g, or 64–75% of the potassium introduced, in the experiment variants. Elevated mobility of fixed potassium in the case of a stronger treatment (2 M HCl, the Pchelkin procedure) and the associated decrease in the difference between the mobile potassium levels before and after incubation with a specific dose of the element may be used to explain this discrepancy. No reliable differences with regard to the average values of potassium fixation capacity were detected between the experiment variants, but the maximal values were observed in the control variant and decreased gradually as the fertilizer doses increased.

中文翻译：

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在不同剂量下单施钾肥后黑钙土的钾固定能力

在六年的肥料使用中断后，已经从单次施用钾肥（0、70、140和280 kg / ha）的田间试验的变种中获得的黑钙土样品中，估计了钾的固定能力。由固定剂量的钾肥（50 mg / 100 g）孵育样品后可交换钾含量的变化推断黑钙土的钾固定能力为45至47 mg / 100 g，即91–95％在不同的实验变体中引入的钾 实际的钾固定能力可能大大高于测得的值。由固定剂量32至38 mg / 100 g钾肥孵育样品后，不可交换钾含量的变化推断出钾固定能力，在实验变体中，占所引入钾的64–75％。在进行更强的处理（2 M HCl，Pchelkin程序）的情况下，固定钾的迁移率升高，以及与特定剂量的元素一起孵育前后流动钾水平之间的差值相应降低，可以用来解释这一点。差异。在试验变体之间未发现钾固定能力平均值的可靠差异，但在对照变体中观察到最大值，并随着肥料剂量的增加而逐渐降低。（Pchelkin程序）以及与特定剂量的元素一起孵育前后流动钾水平之间差异的相关减少可用于解释这种差异。在试验变体之间未发现钾固定能力平均值的可靠差异，但在对照变体中观察到最大值，并随着肥料剂量的增加而逐渐降低。（Pchelkin程序）以及与特定剂量的元素一起孵育前后流动钾水平之间差异的相关减少可用于解释这种差异。在试验变体之间未发现钾固定能力平均值的可靠差异，但在对照变体中观察到最大值，并随着肥料剂量的增加而逐渐降低。