Since the beginning of the 20th century, the ever growing demand for more agricultural products forced farmers to adopt resource-intensive and unsustainable practices which increased economic and environmental costs. Precision agriculture (PA), one of the most significant advancement in agriculture since the advent of mechanization, allows taking into account the spatial and temporal needs of soil and crop to maximize production and profitability while minimizing risk. Wireless sensors networks have recently emerged as one of the key technologies to implement precision agriculture and have already been applied to precision irrigation, the application of water to a given site in a volume and at a time needed for optimum crop production. However, up to now, the lack of adequate sensors for soil fertilizers sensing prevented the implementation of WSNs for site specific fertilization, the application of the right amount of fertilizers at the right time in the right place. The AgriSensAct project will result in the development of an integrated PA system which will allow precise management of the crops taking by integrating several of the main practices of PA. The proposed system is based on the AgriProbe concept, a modular device including specific modules for sensors, energy supply and communications, that can be tailored for each specific agricultural application. The AgriProbe project will result in the development of new processes both for soil nitrogen sensing and energy harvesting and new product concepts including modular sensor probes and contact-connection systems that will allow the SMEs of the consortium to gain o competitive edge in their respective markets and to expand/consolidate their core businesses.