This book is written for undergraduate students who follow the subjects related to the Agronomy and Physiology of latex production of the Rubber tree (Hevea brsiliensis). In this book, author compiled valuable information collected through an extensive literature review and findings of her research related to the girth at opening on growth and yield of Hevea. Therefore the book will serve as a valuable source of information not only to undergraduates but also to postgraduate and professional research workers in the field of agriculture.