Quality and growth development of roselle grown on BRIS soil in relation to regulated deficit irrigation
2014
Naimah R. | Nur Amirah Y. | Adzemi M. A. | Wan Zaliha W. S.
A greenhouse experiment was conducted to evaluate the effects of different irrigation schedules on postharvest quality and growth of roselle and also to determine a significant amount of water to be applied. Thirty-two roselle plants were grown on Beach Ridges Interspersed with Swales (BRIS) soil and treated with four different regimes namely control (100% full irrigation, I), 20% regulated deficit irrigation (RDI) (80% irrigation), 40% RDI (60% irrigation) and 60% RDI (40% irrigation). All the irrigation treatments were replicate quadrice and each replicate comprised two experimental units. RDI imposed for 91 days on roselle plants did not significantly influence plant growth (plant height, stem diameter and number of branches), postharvest quality (titratable acidity, firmness and total anthocyaninsconcentration) and cumulative number of roselle calyx. However, in general, water deficit treatments applied showed a significant effect only in fresh weight and soluble solid concentration (SSC) of roselle calyx. The treatment of 20% RDI increased yield (calyx fresh weight) compared to the control. In conclusion, 20% RDI (80% irrigation) tends to increase roselle yield and maintain plant growth development without adversely affecting calyx quality. Besides, 20% RDI saved water by 20% and increased irrigation use efficiency of roselle planted on BRIS soil.
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