We design, deploy, and evaluate end-to-end communication systems tailored for environmental sustainability and smart agriculture. Through our sensor-rich testbeds, we support experiments in precision farming, irrigation optimization, crop monitoring, and climate observation. Utilizing IoT nodes, LPWAN technologies (such as LoRaWAN), and cloud-edge integration, our infrastructure enables real-time data collection and analysis across large geographic areas. These efforts help researchers and stakeholders validate scalable, low-power, and cost-effective solutions for agricultural productivity and environmental stewardship in authentic rural and semi-urban conditions.