The present book, first of its kind and has been written primarily to cover the interests of scholars working in the field of Allelopathy at various Universities and institutions. The book deals with various aspects of Allelopathic impact of Croton bonplandianum related to crop and weed plants. Physico-chemical properties of soil are also covered with this book. The outline, contents and subject matter has been presented according to the nitches and need of scholars. Efforts have also been made to cope the latest information available.