This monograph deals with the use of wireless sensor network (WSN) and its application in precision farming (PF). The subject is introduced by reviewing the global and Indian agricultural systems in general and identifies a niche for deployment of ICT (Information and Communication Technologies) through WSN. A case study built through a 2 year research project on deployment of WSN in green house at pilot scale and at grapevine in NASHIK district (India) has enabled testing its robustness and permitting to evaluate the input requirement i.e. water requirement and need of pesticides. The monograph delineates the WSN components (hardware and software) and demonstrates the infection index prediction through tabulated and graphical results. Also the technical and social challenges of precision farming systems in India using WSN have been discussed. This Monograph will be useful for both practitioners of precision farming as well as academicians engaged in conducting applied research in the area of WSN and ICT in agriculture.