Abstract:

Abstract：The effects of different potassium application on senescence and yield in peanut (Arachis hypogea) were studied to provide a basis for reasonable potassium application, delaying the senescence and increasing the yield of peanut. Field plot experiment was carried out to study the effects of different potassium application on senescence and yield in peanut (Arachis hypogea). The results showed that photosynthetic rate, chlorophyll content, superoxide dismutase (SOD)、peroxidase (POD)、catalase (CAT) activity and soluble protein content increased at the early growth stage of peanut, but decreased continuously at the late growth stage. In addition, malondiadehyde (MDA) content continually increased during the whole growth period. As potassium application increased from 0 to 150 kg/hm2, MDA content reduced significantly, the activities of SOD, POD, CAT enhanced， soluble protein content, chlorophyll content and photosynthetic rate promoted, which delayed the senescence and increased the yield of peanut. It can bring a negative effect when applying more than 150 kg/ hm2 potassium. All of these indicated that reasonable potassium application would be benefit to delay the senescence and increase the yield of peanut. It was suggested that about 150 kg/m2 was the more suitable rate of potassium application for the growth of peanut.