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Kamarudin, K. N., Jaafar, H. Z., & Sung, C. T. B. (2012). Growth and yield of choy sum (Brassica chinensis var. parachinensis) in response to water stress and nitrogen fertilization levels. Conference: International Agriculture Congress 2012: Transforming Agriculture for Future Harvest, Putrajaya. DOI: 10.13140/RG.2.1.2126.2969