Fog is a natural phenomenon and is formed when water vapours in the air near the surface begin to condense into liquid water. Fog occurs over Punjab (Pakistan), during winter months of November, December and January. The aim of this study was to investigate the dense fog events and also to find the reasons of this prolonged fog. This prolonged/unusual fog affects the air and road traffic badly. Many accidents take place because of poor visibility and many people lose their lives. Using 30-year (1976-2005) real meteorological data of 10-weather stations, four dense fog years were investigated....

Stresses create barriers in normal growth and developmental processes of plants. Plant life cycle is distorted variably depending upon severity of stress, type of stress and growth stage of plant. Among stresses drought is most severe regarding adverse effects to the agricultural crop productivity at Global level. Among cereals, maize is very important cereal due to multiple utilization for versatile purposes. Drought also affects the maize as it does with other crops so, there is dire need to recognize the effects of drought on maize in detail. This book is typically focusing on interference...