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Recently many Wireless Sensor Network (WSN)-based agriculture monitoring systems have been implemented mostly for developed countries. WSN in these monitoring systems uses tree topology and multi-hop dynamic flooding routing protocol that are not energy efficient and has a single point of failure. Though some protocols use zone-based routing they consider that a large number of sensors are deployed to achieve more precision, which is expensive and not feasible in developing countries. In this paper, we propose Energy Efficient Zone-based Routing Protocol (EEZRP) that work by deploying a minimum number of sensor nodes for agricultural monitoring in developing countries. Experimental results show that EEZRP protocol outperforms the existing LEACH and DSC protocols in terms of network lifetime.