Effects of Bulb Size and Fertilizers on Growth, Yield and Color of Polianthes tuberosa “Pink Sapphire”

Nguyen Duyen, Tran Phong and Bui Tam

Background and Objective: The Polianthes tuberosa “Pink Sapphire” is an economical and beautiful flower variety introduced in Vietnam. This research investigated the bulb size characteristics and the fertilizers influenced growth rate, yield and color of fluorescence when cultivated in the An Giang Province, Vietnam. Materials and Methods: In this study, two different sizes of tuberose bulbs (2 and 3 cm diameter), five treatments of root fertilizers and six treatments of foliar fertilizers were used. After that, monitoring indicators related to plant growth, flower yield and flower color were recorded. Data were collected and processed using Microsoft Excel. The One-way ANOVA and Duncan’s were statistically analyzed using SPSS 20. The data in the study were statistically significant at the 95% level. Results: The findings revealed that 3 cm-sized bulbs exhibited better growth, higher yield, earlier flowering and superior flower quality compared to 2 cm-sized bulbs. Moreover, Dau Trau HCMK organic mineral fertilizer (6 g/plant/2 weeks) in combination with NPK 16-16-16+TE chemical fertilizer (1.8 g/plant/2 weeks) expresses the optimal fertilizer mixture. The foliar fertilizers AminoQuelan Mg and Vitazyme consistently showed the best performance in terms of growth and flower productivity indicators. The Đâu Trâu MK 901 foliar fertilizer treatment achieved the highest flower yield. The AminoQuelan Mg foliar fertilizer treatment (B3) produced the most stunning flower color, with color indices of L* = 82.3, a* = 4.0, b* = 4.3 and the highest anthocyanin content of 0.57%. Conclusion: These results helped to optimize the cultivation of the Polianthes tuberosa “Pink Sapphire” and served as a reference database for further research.

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