| Chinese dwarf cherry [Cerasus humilis (Bge.) Sok.] is a kind of unique health fruit with special taste and rich nutrition in China. In this experiment, taking’Jingou 1’in Changping of Bejing as experimental materials, the effects of preharvest spray calcium concentrations, preharvest spray calcium time and postharvest coating chitosan concentrations on the quality of Chinese dwarf cherry fruit during storage were investigated by single factor test and orthogonal experiment. The results would supply the theoretical and practical basis for the storage and preservation of Chinese dwarf cherry. The main research results were list as follows:(1) The effects on changes of decay, sugar content, organic acid content and sugar-acid ratio in Chinese dwarf cherry sprayed with different concentrations of Ca(NO3)2 solution 7 days before harvest were studied during storage. The result suggest the concentrations of calcium preharvest spray in orthogonal experiment were set as 1.0%,1.5% and 2.0%.(2) The effects on changes of decay rate of Chinese dwarf cherry coated with different concentrations of chitosan postharvest were studied during storage. The result suggest the concentrations of chitosan postharvest in orthogonal experiment were set as 0.05%,0.1% and 0.15%.(3) The decay rate at the end of storage of Chinese dwarf cherry in orthogonal experiment showed that preharvest spray calcium concentrations, preharvest spray calcium time and postharvest coating chitosan concentrations influenced the decay rate significantly. The effects of different treatments on the decay rate, its order from high to low:preharvest spray calcium time >postharvest coating chitosan concentrations >preharvest spray calcium concentrations. The best treatment was spraying 2.0%Ca(NO3)221 days before harvest and coating 0.1% chitosan postharvest which was exactly treatment 9. Decay rate of treatment 9 was 21.0% at the end of storage and it was significantly lower than that of other treatments.(4) The sugar-acid ratio at the end of storage of Chinese dwarf cherry in orthogonal experiment showed that preharvest spray calcium concentrations, preharvest spray calcium time and postharvest coating chitosan concentrations influenced the sugar-acid ratio significantly. The effects of different treatments on sugar-acid ratio, its order from high to low: preharvest spray calcium concentrations> preharvest spray calcium time> postharvest coating chitosan concentrations. The best treatment was spraying 1.0% Ca(NO3)2 21 days before harvest and coating 0.1% chitosan postharvest.(5) The reducing power at the end of storage of Chinese dwarf cherry in orthogonal experiment showed that preharvest spray calcium concentrations, preharvest spray calcium time and postharvest coating chitosan concentrations influenced the reducing power significantly. The effects of different treatments on the reducing power, its order from high to low:preharvest spray calcium time >preharvest spray calcium concentrations>postharvest coating chitosan concentrations. The best treatment was spraying 2.0% Ca(NO3)2 21 days before harvest and coating 0.1% chitosan post harvest which was exactly treatment 9. Reducing power absorbance of treatment 9 was 0.67 at the end of storage and it was significantly higher than that of other treatments except treatment 8.(6) In order to evaluate storage and preservation effects of Chinese dwarf cherry comprehensively, comprehensive scoring method was selected. The comprehensive score at the end of storage of Chinese dwarf cherry in orthogonal experiment showed that preharvest spray calcium concentrations, preharvest spray calcium time and postharvest coating chitosan concentrations influenced significantly on comprehensive score. The effects of different treatments on comprehensive score, its order from high to low:preharvest spray calcium time >preharvest spray calcium concentrations >postharvest coating chitosan concentrations. The best treatment was spraying 1.0% Ca(NO3)2 21 days before harvest and coating 0.1% chitosan post harvest. |
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