| Summary: | 碩士 === 國立嘉義大學 === 園藝學系研究所 === 105 === In order to solve agricultural wastage and lower the increasing price of cultivation medium, the present study was to investigate the efficiency of mixtures of tea residues and rice bran by composting as alternative medium. In addition, the fermentation broth was used to investigate the germination rate of spinach seeds, as well.
The current study shown that the pH value of the tea and rice bran mixtures was between 3.99-5.15 in 2015, and between 5.24-5.89 in 2016, respectively. On the other hand, the electrical conductivity (EC) was the lowest seen in 100% tea residues; 1.62 μs cm-1 in 2015 and 2.48 μs cm-1 in 2016, respectively. In addition, the percentage of organic matter (OM) was between 13.11-14.47% in 2015 and 16.51-18.26% in 2016, respectively. The averaged temperature of compost was 21℃ in 2015 and 25℃ in 2016. Although there was no significant difference found in nitrogen content among all compost mixtures either in 2015 or in 2016, the highest amount of nitrogen was recorded in 100% tea residues in both years and was between 1.60 g kg-1-2.13 g/kg in 2015 and 1.93 g/kg-2.38 g/kg in 2016, respectively. The highest calcium content was calculated in 100% tea residues in both years which 54.96 mg/kg in 2015 and 55.73 mg/kg in 2016. However, the highest amount of magnesium was found when 25% of tea residues in compost mixtures in both years which were 10528.85 mg/kg in 2015 and 3669.67 mg/kg in 2016. Furthermore, the highest potassium value was observed when compost mixtures with 50% tea residues, 12314.12 mg/kg in 2015 and 14693.90 mg/kg in 2016, respectively. Interestingly, the highest sodium content was also obtained in 100% tea residues in both years, 4.19 mg/kg in 2015 and 3.51 mg/kg in 2016. Besides, there was no significant difference in seeds germination rate among all compost mixtures.
Although the mean days of seeds germination was shown no significant difference when treated with fermentation broth, but the 10 times dilution of fermentation broth from 100% and 75% tea residues had better germination rate than control treatment. The study shown used dilution of fermentation broth can increase seed germination, the higher dilution the more increase germination.
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