Effects of on Cucumber Seedling Growth and Photosynthetic System under Different Potassium Ion Levels.

Potassium deficiency is one of the important factors restricting cucumber growth and development. This experiment mainly explored the effect of () on cucumber seedling growth and the photosynthetic system under different potassium levels, and the rhizosphere bacteria (PGPR) that promote plant growth were used to solubilize potassium in soil, providing theoretical support for a further investigation of the effect of biological bacteria fertilizer on cucumber growth and potassium absorption. "Xinjin No. 4" was used as the test material for the pot experiment, and a two-factor experiment was designed. The first factor was potassium application treatment, and the second factor was bacterial application treatment. The effects of different treatments on cucumber seedling growth, photosynthetic characteristics, root morphology, and chlorophyll fluorescence parameters were studied. The results showed that potassium and had obvious promotion effects on the cucumber seedling growth and the photosynthesis of leaves. Compared with the blank control, the treatment had obvious effects on the cucumber seedling height, stem diameter, leaf area, total root length, total root surface area, total root volume, branch number, crossing number, g, WUE, Ci, and A; the dry weight of the shoot and root increased significantly ( ≤ 0.05). Potassium application could significantly promote cucumber growth, and the effect of and potassium application was greater than that of potassium application alone, and the best effect was when 0.2 g/pot and were applied. In conclusion, potassium combined with could enhance the photosynthesis of cucumber leaves and promote the growth of cucumber.