The soil non-exchangeable potassium (K) pool contributes significantly to meeting crop K requirements. The objective of this study was to determine wheat and rice grain yield responses to different concentrations of sodium tetraphenylboron (NaTPB) extractable non-exchangeable K in soils. A field experiment was conducted over a period of 4 years using three K application strategies in soils with high (JY) and low (GD) levels of non-exchangeable K. In both soils, rice yield was unaffected by K application during the 4-year study period. However, in GD soil, wheat was unable to produce grains without K additions (0 K) during the fourth wheat season. In JY soil, wheat grain yield decreased only in the 0 K (by 11%) compared with the recommended K application during the fourth wheat season. Different responses in wheat between the two soils indicated that NaTPB-non-exchangeable K better represented the soil K supplying capacity than it did exchangeable K. Lower amounts of non-exchangeable K extracted by NaTPB in GD soil were mainly due to lower amounts extracted during the 0–5 s and 5–10 min time periods. Straw retention alone resulted in negative K balances, with 100 kg K ha⁻¹ yr⁻¹ in JY soil and 95 kg ha⁻¹ yr⁻¹ in GD soil. In conclusion, recommended K application combined with NaTPB-K monitoring would be useful for sustaining crop yield and soil K fertility among different soils in rice–wheat cropping systems.

中文翻译：

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两种土壤类型对水稻和小麦产量和土壤钾素变化的响应

土壤不可交换的钾（K）库对满足作物钾的需求做出了重要贡献。这项研究的目的是确定小麦和水稻对土壤中不同浓度的四苯基硼酸钠（NaTPB）可提取的不可交换钾的响应。在高（JY）和低（GD）不可交换钾水平的土壤上，使用三种钾肥施用策略，在4年的时间里进行了田间试验。在两种土壤中，水稻的产量在4年中均不受钾肥施用的影响。一年学习期。但是，在GD土壤中，在第四个小麦季节中，如果不添加K（0 K），小麦将无法产生谷物。在JY土壤中，与第四个小麦季节推荐的施钾量相比，仅在0 K下小麦籽粒产量仅降低了11％。两种土壤中小麦的不同响应表明，NaTPB不可交换的钾比可交换的钾更好地代表了土壤钾的供应能力。 0-5秒和5-10分钟的时间段。仅秸秆保留会导致负钾平衡，达到100 kg K ha^-1 年^-1在JY土壤和95公斤公顷^-1 年^-1 在GD土壤。总之，推荐的钾肥施用与NaTPB-K监测相结合将有助于维持稻麦系统中不同土壤间的作物产量和土壤钾肥力。