Phenolic Constituents from the Fruits of Areca catechu and Their Anti-bacterial Activities Studies on the Effect-increasing Components for Molluscicides in Nut of Areca catech L Research on the ratio and contents of N, P, K by arecanut (Areca catechu L.) leaves in different growth conditions Influence of different planting spacing of areca nut intercropping with Vanilla on soil microbes and nutrients Effect of different fertilization and irrigation practices on soil ammonia volatilization of Arecanut (Areca catechu L.)