Reasonable fertigation methods are essential for plant growth, as excessive or inadequate water and fertilizer supply can lead to plant diseases, resource consumption, or even crop production reduction. These problems are common to local farmers in Malaysia, especially for large-scale chilli cultivation using traditional irrigation approaches in rural areas. These problems need to be addressed, as chilli are one of Malaysia's high-cash crops with massive local demands. Realizing an efficient irrigation control approach using an innovative fertigation method is a potential solution to tackle such problems. This paper proposes a smart fertigation system for chilli cultivation in greenhouses in urban areas to increase chilli production and improve irrigation management. The proposed system utilized the fuzzy logic method for intelligent irrigation decisions, where the decision is based on the input data provided by soil moisture, temperature, and humidity sensors. In addition, the proposed system can monitor and control irrigation in the greenhouse remotely through a website that was developed using the Hostinger platform. The results showed that the fuzzy-based fertigation approach produced approximately 50% irrigation application efficiency and a higher growth gradient and chilli yield than the traditional approach in both cycles.

The proposed smart fertigation system has the potential to significantly transform chilli cultivation in Malaysia by improving agricultural productivity, resource efficiency, and sustainability. By integrating fuzzy logic with IoT-based soil moisture, temperature, and humidity sensors, the system enables precise irrigation and fertilizer application, resulting in approximately 50% higher irrigation efficiency and increased chilli yield compared to traditional methods. This precision reduces plant diseases, optimises water and nutrient usage, and ensures more consistent crop quality, directly benefiting farmers through higher profit margins and lower input costs. The system’s remote monitoring and control capabilities via a Hostinger-based platform further reduce labour demands and enable better management, making it highly suitable for urban greenhouse farming. Beyond economic gains, the approach promotes sustainable agriculture by conserving water, minimising environmental pollution from excess fertilizers, and supporting climate-resilient farming practices. Overall, this innovation offers a scalable and practical solution to address inefficiencies in traditional irrigation, meeting Malaysia’s high domestic demand for chilli while advancing the adoption of modern precision agriculture technologies.