Pinexri is a complete smart farming IoT system that integrates the innovative autonomous fertilising drone with real-time soil and crop monitoring. This novel system will help the agriculturist to reduce the human workforce dependency, while maintaining the soil quality during daytime and night-time through the IoT integrated system. Persistently designed with every detail to meet the industrial needs, Pinexri creates new dimensions of the optimal solution for smart agriculture with high precision and operational efficiency. It is powered by robust motors with large size slow-rotating propellers and reinforced by a lightweight composite structure to support a higher payload without sacrificing flight stability and agility. The autonomous system operation is based on the pre-defined flight path with automatic flight stability control. The spraying system is designed with an intelligent automatic electronic control spraying beam operating system for optimal spraying coverage. A high precision positioning system is embedded to achieve the right altitude, position, and spraying area with a very minimal error. Pinexri is crafted into the utmost balance between cost, precision, and safety. It is capable of overcoming imprecision, low efficiency, labour intensity, and chemical exposure in comparison with the traditional agricultural approach. During the Covid-19 outbreak, Pinexri is a smart alternative solution to assist the labour shortage by reducing the human workforce dependency without sacrificing the quality of the crops.