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This paper focuses on providing an overview of zigbee based wireless sensor network (WSN) as applied in agriculture for intelligent farming. In this research work, a survey on wireless sensor networks and their standards and technologies in the field of agriculture was carried out. Based on the analysis and survey, the need for intelligent farming especially in developing countries like India, has grown to a greater extent. In this paper we try to survey different applications of zigbee based wireless sensor network in agriculture such as monitoring of environmental conditions like weather, soil moisture content, soil temperature, soil fertility, weed-disease detection, monitoring leaf temperature/moisture content and monitoring growth of the crop, precision agriculture, automated irrigation facility, storage of agricultural products etc. This paper also provides the possible research issues existing in Physical layer of ZigBee.