The crop yields and potassium use efficiency (KUE) could be enhanced by controlled-release potassium chloride (CRK), yet the effects of blending 50 % CRK and 50 % soluble potassium chloride (BBF), on crop physiological-biochemical characteristics were not reported. We carried out a five-year field experiment during 2014–2019 with five K fertilization treatments in a completely randomized block design using wheat (Triticum aestivum. L.) as a testing crop. The results showed that: compared with K1 (full-dose of soluble potassium chloride (KCl)) treatment, the SPAD value and photosynthetic rate of BBF1 (full-dose of BBF) treatment were increased by 7.3–12.2 % and 36.5–59.0 %, respectively, at jointing and grain-filling stages; the auxin and abscisic acid in leaves and roots of BBF1 treatment proliferated by 14.0 %, 27.2 % and 19.5 %, 25.0 %, respectively, at jointing stage; the root total volume and surface area of BBF1 treatment were sharply risen by 80.2 % and 38.8 %, respectively, at jointing stage. The yield and net profit of BBF1 treatment increased by 5.0–19.7 % and 7.2–28.7 %, respectively. With K fertilization rate reduced by 30 %, BBF2 treatment produced almost the same yield as with the 100 % rate of monotypic soluble KCl treatment. This study demonstrated that combining CRK and soluble KCl improved the root physiological characteristics and endogenous hormones of wheat and consequently increased wheat yield.

控释氯化钾（CRK）可以提高作物的产量和钾利用效率（KUE），但尚未报道50％CRK和50％可溶性氯化钾（BBF）混合对作物生理生化特性的影响。我们在2014–2019年期间进行了为期五年的田间试验，采用小麦（Triticum aestivum）在完全随机区组设计中对五种钾肥进行了完全随机分组设计。。L.）作为试验作物。结果表明：与K1（全剂量可溶性氯化钾）处理相比，BBF1（全剂量BBF）处理的SPAD值和光合速率分别提高了7.3-12.2％和36.5-59.0％分别在拔节和灌浆阶段；在拔节期，BBF1处理的叶和根中的生长素和脱落酸分别增长了14.0％，27.2％和19.5％，25.0％。在拔节阶段，BBF1处理的根总体积和表面积分别急剧增加了80.2％和38.8％。BBF1处理的产量和净利润分别增加了5.0–19.7％和7.2–28.7％。随着钾肥施用量减少30％，BBF2处理产生的产量几乎与单型可溶性KCl处理100％的产率相同。