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Few yield monitoring systems exist for horticultural crops. Yield maps can play an important role in the advent of big data in agriculture. The majority of horticultural crops are hand harvested and are diverse, which complicates the development of yield monitoring systems for such crops. Commercial systems for real time yield monitoring of horticultural crops involve use of load cells, which require further improvement to provide information on crop quality and noise filtration. Other technologies covered in this short literature review include machine vision, capacitance, RFID, ultra-wide radar systems and LIDAR for the purpose of yield monitoring of horticultural crops.