White turmeric (Curcuma aromatica Salisb.) contains notable secondary metabolites with significant health benefits. However, the efficiency of traditional cultivation of white turmeric is limited by many environmental factors. Therefore, it is of great significance to study the large-scale production of superior-quality microrhizomes for cultivation and secondary metabolite extraction, without relying on natural rhizomes. In this study, the effects of sucrose, plant growth regulators (6-benzyl amino purine – BAP, kinetin – KIN,

This paper describes an asymmetric electro-pneumatic servo valve and hardware compensation approaches for high speed control of rise time and step-down time. The flow capacity of the downstream control orifice of asymmetric valve is about twice of that of the symmetric valve at the same spool displacement. Experimental results show that the bandwidth is 200Hz and rise time is less than 1 ms. The flow capacity of the downstream control orifice of asymmetric valve (337NL/min) is about twice of that of the symmetric valve (171NL/min).