Changes of soil fertility upon ginkgo cultivation

We studied ginkgo-cultivated soils in Taixing,Jiangsu.It was foung that the pH values in the soil horizon of 0 to 40 cm declined,while that in the soils of 40 to 100 cm increased.Besides,soil organic matter accumulation became larger,and the contents and availability of N,P,and K were also increased significantly.The results indicated that the soil fertility was improved due to cultivation of ginkgo.