Salinity is a major limiting factor which disrupts the plant physiology as well as reduces the plant growth. Salinity stress can be minimized by potassium application as it regulates the plant growth. Protective effect of potassium application on NaCl induced stress in two tomato genotypes (Nasir and Skyland-II) at two levels of NaCl (0 and 7.5 dS m⁻¹) combined with two levels of soil -applied K (0 and 4.50 mM) as well as with two levels of foliar-applied K (0 and 2% solution) was studied. Results showed that Skyland-II had significantly more dry biomass production, shoot K⁺ concentration under saline condition (7.5 dS m⁻¹) and Nasir tomato genotype. Potassium contents were significantly higher when potassium was applied which reduced the adverse effect of salinity and thus enhanced the plant biomass. The increasing concentration of potassium in the Skyland-II genotype positively affected chlorophyll contents, stomatal conductance and K⁺/Na⁺ ratio. Salinity stress adversely reduced plant growth in both of the genotypes. It was concluded that potassium application improved plant growth especially in the Skyland-II genotype. Comparing the application methods, the soil applied potassium improved plant growth and decreased the adverse effect of salinity and could be used as an effective method for better production.

盐度是破坏植物生理以及减少植物生长的主要限制因素。钾肥可调节植物的生长，因此可将盐分胁迫降至最低。钾对两种基因型（Nasir和Skyland-II）的NaCl诱导的胁迫的保护作用分别在两个NaCl水平（0和7.5 dS m ^-1）以及两个水平的土壤施用K（0和4.50 mM）下还研究了两个水平的叶面施钾量（0和2％溶液）。结果表明，斯凯兰-II具有显著更多干生物质的生产，枝条ķ ⁺浓度盐水的条件下（7.5德尚中号^-1）和Nasir番茄的基因型。施钾时钾含量明显更高，这降低了盐度的不利影响，从而增强了植物的生物量。Skyland-II基因型中钾浓度的增加对叶绿素含量，气孔导度和K ⁺ / Na ⁺比值产生正向影响。盐分胁迫不利地降低了两种基因型的植物生长。结论是钾的施用改善了植物的生长，特别是在Skyland-II基因型中。与施用方法相比，土壤施用钾肥可促进植物生长，减少盐碱化的不利影响，可作为提高产量的有效方法。