Irrigation patterns and K fertilization are the key measures used to improve the salt tolerance of crops in saline land. A pot experiment was carried out to assess the effects of partial root-zone irrigation and K fertilization on maize in saline land. For the study parameters, we used a split plot design with three irrigation treatments (conventional irrigation (CI), fixed root-zone irrigation (FRI) and alternate root-zone irrigation (ARI)) and two K application rates (0 (K0) and 120 (K1) kg K2O ha−1). Compared with the CI treatment, the FRI and ARI treatments reduced the transpiration rate (Tr) and MDA content but increased the root length density (RLD), root surface density (RSD), root volume density (RVD), root dry weight density (RDWD), proline content, plant K/Na ratio, photosynthetic rate (Pn), yield, water use efficiency (WUE) and K use efficiency (KUE). Compared with the FRI treatment, the ARI treatment increased RLD, RSD, RVD, RDWD, the Tr, the proline content, the plant K/Na ratio and the Pn but decreased the MDA content; these factors increased yield, WUE and KUE. K application decreased the MDA content; improved root growth; and increased the stomatal conductance, Tr, proline content, Pn, yield and WUE. Of all the treatments, the ARI-K1 treatment maximized RLD, RSD, RVD, RDWD, the Pn and yield while minimizing the MDA content. Therefore, ARI combined with K application can maximize resistance to salt stress and osmotic stress, delay senescence, and improve photosynthesis, yield and WUE.

中文翻译：

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部分根区灌溉和施钾可以提高夏玉米产量和盐渍土壤的抗盐性


灌溉模式和钾肥是用于提高盐碱地作物耐盐性的关键措施。进行了盆栽试验，以评估部分根区灌溉和钾肥对盐碱地玉米的影响。对于研究参数，我们使用了具有三种灌溉处理（常规灌溉 （CI）、固定根区灌溉 （FRI） 和交替根区灌溉 （ARI））和两种钾施用量 （0 （K0） 和 120 （K1） kg K2O ha-1）的裂区设计。与CI处理相比，FRI和ARI处理降低了蒸腾速率（Tr）和MDA含量，但提高了根长密度（RLD）、根表面密度（RSD）、根体积密度（RVD）、根干重密度（RDWD）、脯氨酸含量、植株K/Na比、光合速率（Pn）、产量、水分利用效率（WUE）和钾利用效率（KUE）。与 FRI 处理相比，ARI 处理提高了 RLD、RSD、RVD、RDWD、tr、脯氨酸含量、植株 K/Na 比值和 Pn，降低了 MDA 含量;这些因素提高了产量、WUE 和 KUE。K 应用降低了 MDA 含量;改善根系生长;并增加了气孔导度、 Tr 、 脯氨酸含量 、 Pn 、 产量和 WUE。在所有处理中，ARI-K1 处理使 RLD、RSD、RVD、RDWD、Pn 和产量最大化，同时最小化 MDA 含量。因此，ARI 联合 K 施用可以最大限度地提高对盐胁迫和渗透胁迫的抵抗力，延缓衰老，并提高光合作用、产量和 WUE。