Effects of potassium fertilizer on dry matter accumulation and potassium absorption characteristics of maize (Zea mays L.) inbred lines with different yield types

In this experiment, 20 different maize inbred lines were used as basic materials, which were divided into high-yield type, middle-yield type and low-yield type by yield cluster analysis. A 3-year long-term positioning field experiment (2016-2018) was carried out to assess the effects of potassium fertilizer on dry matter, potassium absorption and potassium absorption efficiency of maize inbred lines with different yield types. The results showed that the dry matter, potassium absorption and potassium absorption efficiency of leaf, stem, bract, rachis and grain of maize inbred lines have been significantly increased with potassium application in comparison with no potassium application. Potassium fertilizer could improve the dry matter accumulation capacity and potassium absorption characteristics of maize, promote the potassium absorption by maize plants, influence the growth and development of maize, and then improve the maize yield. The decrease of dry matter, potassium absorption and potassium absorption efficiency of high-yield maize inbred lines was smaller under low potassium stress. The high-yield maize inbred lines had stronger ability to maintain higher dry matter accumulation and potassium absorption characteristics under low potassium stress. The study provided a theoretical basis for the breeding of potassium-efficient maize materials.