Review on Effect of Shade Tree on Microclimate, Growth and Physiology of Coffee Arabica: In case of Ethiopia

The word "coffee" comes from the name of a region in Ethiopia where coffee was first discovered – ‘Kaffa’. The name ‘Kaffa’ is inherited from the hieroglyphic nouns ‘KA’ and ‘AfA’. ‘KA’ is the name of God; ‘AFA’ is then ame of earth and all plants that grow on earth. So the meaning of Koffee (Coffee) from its birth-place bells on as the land or plant of God. In addition to this, as a result of the genetic diversity of Ethiopian coffee, botanists and scientists agree that Ethiopia is the centre for the origin, diversification and dissemination of coffee plant (Bayetta, 2001). According to (Tadse , 2015), there are four types of coffee production systems in Ethiopia: forest coffee (10%), semi forest coffee (35%), garden coffee (50%) and plantation coffee (5%). Climatic factors, type of soil, mulching, farm management method, crop production methods, etc. are among the prominent factors that affect the growth and development of plants including coffee. Amongst the various factors for having a good yield of coffee is growing of shade trees with the coffee plant which has a great contribution on both the life span of the coffee trees and its yield (Senbeta 2006)