Improved post-harvest handling of green tea leaf to reduce deterioration in the field | |
| Author | Machfoedz, Mustofa Kamal |
| Call Number | AIT Thesis no. AE-87-23 |
| Subject(s) | Tea Green tea Farm produce--Handling |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | A study on the post - harvest field handling systems of green tea leaf , using leafs tor age without shade, storage under shade without treatment, and storage under shade combined with dipping or s praying with cool water was investigated. Changes in moisture content, respiration rate, and aroma of tea leaf, considered as three major factors of green tea leaf closely related to leaf quality prior to processing , were also investigated. An analysis on respiration rate of tea leaf resulted in a Respiratory Quotient of 1. 017 and a G10 of 2.13 a nd 1 .96 for a temperature rise from 15 to 25°C and from 20 t o 30°C, respectively. Moisture content loss and aroma were found t o be related to the temperature and time duration of storage. Water used as a medium to dipper spray the leaf on the · field was cooled using night-sky radiation before it was used in handling. This method reduced the initial temperature of the water by 4°C. Results of the study indicated that dipping of tealeaf every hour for two minutes per dip in the cooled water was a suit able handling system to be used on green tealeaf while awaiting transportation to the factory. The system was able t o l ow e r t he lea f temp e r a tur e by 4°C and keep the rate of temperature rise a t 0.52°C per hour. The effect of temperature drop on the tealeaf characters , indicated a retardation of the respiration rate by 8% that kept the value of aroma 1.1 higher than the existing handling method (based on zero to 10 value ) . The freshness of tealeaf was better in comparison to the normal handling system existing in small holder tea plantations . |
| Year | 1987 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Illangantileke, Sarath G.; |
| Examination Committee(s) | Jindal, Vinod Kumar ;Athapo l No omhorm; |
| Scholarship Donor(s) | IBRD/NES Project of the Government of Republic of Indonesia ; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1987 |