Drought is a world wide production constraint of Common bean. The effective approach in breeding for drought tolerance in common bean would be based first on selection for high geometric yield followed by high-yielding individuals for low to moderate levels of the drought susceptibility index. The tolerant genotypes had less affected leaf area and shoot dry weight, greater root weights and higher root/shoot ratios and less degradation chlorophyll contents than the drought susceptible genotypes. The yield reduction was caused by water stress attributed mainly due to reduction in pods plant-1. The high relative water content, minimal midday drop of relative water content, lower water uptake capacity and low rate of transpiration may probably enable plant to maintain a high water content in leaf cells under drought condition. The drought avoidance included the development of better root characteristics, an efficient stomatal closure and paraheliotropic leaf movement that altogether regulated water balances more in the tolerant genotypes. The mechanism of drought tolerance included osmotic adjustment and protection of membrane system.
Water is vital to the existence of all living organisms, but this valued resource is increasingly being threatened as human populations grow and demand more water of high quality for domestic purposes. Water can contain substances that are harmful to life.These include metals such as mercury,lead and cadmium,pesticides,organic toxins and radioactive contaminants. However, some of these, particularly bacteria, protists, parasitic worms, fungi, and viruses, can be harmful to humans if present in water used for drinking.Initiatives to better the quality of drinking water at household level have been effective in reducing the occurrence of waterborne diseases.One such system is water purifier system (water disinfection).This book tests the performance evaluation of common water purifiers for increase in improved drinking water supplies reduced household expenditure on water quality, setting some source protection benefits. This book will definitely serve not only as an excellent reference but also as a practical guide for physico-chemical characteristics of water.Book will be useful to environmentalist,teachers,students and common peoples,interested in household common water purifiers
Material: PVC - Power: 144W - Common anode - Dynamic effects: 19 - Static color: 20 - PWM control Level: 256 - Rated voltage: 12~24V - With power off automatic memory function - Compact convenient to install and hidden - With dynamic cycle demonstration function - Brightness and speed adjustable - With MODE SPEED/BRIGHT COLOR buttons - Suitable for RGB strip control - Includes 2 PCS per pack
Material: PVC - Power: 144W - Common anode - Dynamic effects: 19 - Static color: 20 - PWM control Level: 256 - Rated voltage: 12~24V - Current: Max. 4A per channel - With power off automatic memory function - Compact convenient to install and hidden - With dynamic cycle demonstration function - Brightness and speed adjustable - With MODE SPEED/BRIGHT COLOR buttons - Suitable for RGB strip control - Includes 2 PCS per pack