This book explains the effect of different tolerant stress agents such as antioxidants, natural extracts,biofertilizers, etc..... on physiological, viral and nutrition responses in plants and soils. Also, introduces some of the different methods used to tolerant stress resulting from the increase of free radical of some other elements. This in addition to the recognize of the internal changes resulting from virus infection. The main goal of this book was to get the highest productivity with the highest quality of crops that have been planted under the egyptian soil conditions.