Potassium Application Alleviated Negative Effects of Soil Waterlogging Stress on Photosynthesis and Dry Biomass in Cotton

Soil waterlogging is one of the most serious abiotic stresses on plant growth and crop productivity. In this study, two potassium application levels (0 150 kg K2O hm−2) with three types soil treatments d, 3 d 6 d) were established during cotton flowering boll-forming stages. The results showed that markedly reduced RWC (relative water content), gas exchange parameters biomass. However, considerably improved aforementioned parameters. Specifically, increased Pn (net photosynthetic rate), Gs (stomatal conductance), Ci (intercellular CO2 concentration) Tr (transpiration rate) by 4.55%, 27.27%, 5.74% 3.82%, respectively, compared under no potassium, while abscission rate 2.96%. Additionally, number bolls fruit nodes 16.17% 4.38%, potassium. Therefore, it was concluded regardless or waterlogging, alleviated negative effects regulating status, capacity in cotton. These are expected to provide theoretical references practical applications for production mitigate damage waterlogging.