连作对菊花生长及其根际土壤养分的影响OACSTPCD

In order to explore the effects of continuous cropping on the growth of chrysanthemums and the nu-trient status of rhizosphere soil.The study took chrysanthemums and their rhizosphere soil under no continuous cropping(CK),2 years of continuous cropping(CM2),and 9 years of continuous cropping(CM9)as re-search objects.Agronomic traits of chrysanthemums and the nutrient content of soil were determined,and the changes in growth indicators of chrysanthemums and nutrient content of rhizosphere soil under different years of continuous cropping were analyzed.The results showed that continuous cropping led to nutrient imbalance in the soil,poor growth state and lower quality of chrysanthemums.After long-term(9 years)continuous crop-ping,the organic carbon and total potassium content of the soil decreased by 39%and 5%respectively,com-pared to the control,while the total nitrogen and total phosphorus content increased by 60%and 71%,respec-tively.Compared to the control,the root length,root volume and root surface area of chrysanthemums were de-creased by 31%,22%and 39%respectively.While,the ornamental characteristics of chrysanthemums,such as plant height,stem diameter,and flower diameter,decreased by 20.0 cm,1.60 mm and 10.0 cm,respec-tively.This study analyzed the growth status of chrysanthemums and the changes in soil chemical properties un-der continuous cropping.Providing theoretical support for the rational formulation of measures to alleviate con-tinuous cropping obstacles and fertilization strategies.