PLG Vlek – författare

This book covers an extensive knowledge of the author with regard to the competitive interaction of crop plants and a perennial noxious weed of the world. The author served as crop protection expert for many years in Ethiopia before he gets admitted for post graduate study at Institute of Tropical and Subtropical Agriculture in Goettingen, Germany. The result of his research work as a post graduate student was documented to demonstrate the presence of competition between yellow nutsedge (Cyperus esculentus L.) and maize or corn (Zea mays L.).So far, all loss of yield by yellow nutsedge was conducted using a herbicide and other means of control when the weed is growing naturally with crop plants. However, in this experiment the amount of yield losses to maize plant because of competition with the weed was determined without using herbicide and by maintaining different population of the weed to grow with a constant number of crop plant in a controlled environment. The study covers not only the loss of yield because of the weed but also the factors of competition such as nitrogen use efficiency and water use efficiency. The N-15 isotope was used in this experiment to determine the flow of nitrogen in the shoot and root system of both plants.A well-known scientist, agronomist, researcher, and lecturer professor Paul L.G Vlek and a weed scientist professor Barbael Gerowitt advised me while this experiment was conducted. This experiment was very expensive had it been not financed by University of Goettingen and the German Academic Exchange of Germany (DAAD). Therefore, I want to share my experience in conducting this experiment and its results to those academic institutions, farmers, and research institutes who are interested in the subject.

This book summarizes a long-term research project addressing land and water use in the irrigated areas of the Aral Sea basin. In an interdisciplinary approach, natural and human sciences are combined to elucidate the challenges of economic transition that affect the use of land, water and biological resources, ecological sustainability, economic efficiency and the livelihoods of the local population. The research focuses on Khorezm, a region in Uzbekistan, located on the Amudarya river, in the heart of Central Asia. A series of chapters describes the biophysical environment and the aspects of society and institutions that shape land and water use. The book discusses options and tools to improve land and water management, and to reform the economic system management, based on agronomic, hydrological, economic ans social studies and modeling. The insights are not only important for Uzbekistan, but for all countries in transitions and irrigated dryland areas elsewhere.

This book summarizes a long-term research project addressing land and water use in the irrigated areas of the Aral Sea basin. In an interdisciplinary approach, natural and human sciences are combined to elucidate the challenges of economic transition that affect the use of land, water and biological resources, ecological sustainability, economic efficiency and the livelihoods of the local population. The research focuses on Khorezm, a region in Uzbekistan, located on the Amudarya river, in the heart of Central Asia. A series of chapters describes the biophysical environment and the aspects of society and institutions that shape land and water use. The book discusses options and tools to improve land and water management, and to reform the economic system management, based on agronomic, hydrological, economic ans social studies and modeling. The insights are not only important for Uzbekistan, but for all countries in transitions and irrigated dryland areas elsewhere.