Effects Of Bagging On Growth And Quality Tomato And Cucumber In Greenhouse

According to the problem of pesticide residued in greenhouse vegetable, because ofconflicting each other between the production of cucumber and tomato and the safetyperiod of pesticide used cultivation of continuous picking and pesticide use safety interval,taking the way of isolating the pollution mode, taking over small tomato “Jia Xina” andgreenhouse cucumber “Jin You39” as test materials, this paper studied themicroenvironment inside2kinds of material fruit bags of the polypropylene transparentplastic film bag (TPF) and the polyethylene white paper film bag (WPF) on its growth,quality, chlorophyll and photosystem Ⅱ(PS Ⅱ) influence in four seasons.taking over small tomato “Jia Xina” as test material, the results showed that, thetemperature which inside the bags with TPF and WPF was obviously decreased, thetransmission rate of the TPF is higher than the WPF, the weight of fruit and the volume offruit inside the WPF with8holes were remarkably increased compared with CK, increasedby20.86%and20.94%on average, which improved the index of fruit surface color andfruit clean, enhance the appearance of tomato commodity quality. Except the soluble sugarof tomato with the TPF was lower than others in summer, the soluble sugar, vitamin C andfree amino acids of tomato with the fruit bagging were not changed remarkably comparedwith CK in other three seasons, which improved the negative effect of bagging on tomatofruit quality, comprehensive comparison of its growth quality, the evaluation of fruitcomprehensive with the WPF were higher than those of TPF. The original photochemicalpotential of PSII promoted in the prophase of the fruit growth when the light in fruit bag ofWPF was down, however the original photochemical potential of PSII and the chlorophyllwere reduced in the later period of the fruit growth. In summer, the quantum yield ofnon-regulatory energy dissipation (Y(NO)) was improved with the WPF, the maximumquantum yield of primary photochemistry of PSII (Fv/Fm) and the quantum yield ofregulated energy dissipation (Y(NPQ)) were remarkably decreased with the bags of TPF,the quantum yield of non-regulatory energy dissipation(Y(NO)) was up, increased by21.17%. In short, the actual photochemical efficiency of PSII of the fruit inside the WPFwith lower transmission rate was come down, meanwhile, distributed energy flow wasmore dependent upon the quantum yield of non-regulatory energy dissipation(Y(NO)).Taking over greenhouse cucumber “Jin You39” as test material, the results showed that,compared with sealing bags of Tf and Wf, the temperature which inside the bags of Tt and Wt were obviously decreased and close to CK, which slightly high0.1~0.3℃. the solublesugar, vitamin C and free amino acids of cucumber with the fruit bagging were notchanged remarkably compared with CK, the bending degree and the chlorophyll ofcucumber was remarkably decreased compared with CK, more straighter and more greenerthan CK, which improved the index of fruit surface color and fruit clean, enhance theappearance of cucumber commodity quality. In any case, enough ligh（tCK and TPF）madefor forming chlorophyll of cucumber surface, the maximum quantum yield of primaryphotochemistry of PSII (Fv/Fm) were high level; weak light（WPF and winter）made themremarkably decreased. The effective quantum yield of PSII (Y(Ⅱ)) of summer wasremarkably higher than those of spring, autumn and winter. In addition, the quantum yieldof regulated energy dissipation (Y(NPQ)) was remarkably decreased with the bags of TPFwith high transmission rate in hot summer and WPF with low transmission rate in coldwinter, the quantum yield of non-regulatory energy dissipation(Y(NO)) was up, increasedby30.86%, which presented photosynthetic mechanism damaged in high or lowtemperature conditions.