The results showed that the volatile oil content of rhizome and tuber of Curcuma longa collected in1February was 0.69% and 0.24%, while the volatile oil content of rhizome and tuber of Curcuma longa collected in March of the following year was 0.63% and 0.23%. Therefore, turmeric should be harvested in late February of/kloc-0. At this time, the stems and leaves gradually wither, and the root tuber has grown and enriched, so it can be harvested. When it is dry in sunny days, cut off the seedlings on the ground, dig 45 ~ 67 cm deep with long hoes and other tools, dig out the underground parts line by line, remove the soil and stems, select the seed roots, wash the roots with water, and put them in a pot to cook or steam them to the heart. The content of volatile oil in rhizome and tuberous root of Curcuma longa has not changed obviously after the above treatment, and Curcuma longa is easier to dry and less prone to mildew and deterioration after steaming. After steaming, take it out and dry it slightly. You can dry it on the kang. After drying, the rough skin is knocked off in a collision cage to obtain dried ginger yellow with a dark yellow appearance; Spray some water when shaking, sprinkle some fine turmeric powder at the same time, and then shake, which can make turmeric turn golden yellow and more vivid. You can also cut the rhizome into 0.7 cm thick slices and dry them in the sun.

Curcuma rhizome