共查询到16条相似文献，搜索用时 343 毫秒
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研究不同套袋时期对台农1号芒果果实外观、果皮色素、果皮色泽、果实内在品质的影响。结果表明,随着套袋时间的推迟,果实病虫果率提高,果实表面光洁度降低;不同套袋时期均显著降低果皮的叶绿素、类胡萝卜素含量,花青苷含量以早套袋处理低于晚套袋和未套袋处理;果皮亮度以不同套袋时期显著高于未套袋处理,色彩浓度以晚套袋和未套袋处理略高于早套袋处理,色度角处理间差异不显著;果实内在品质,不同套袋时期均不同程度的降低了果实的可溶性固形物、蔗糖、葡萄糖和果糖含量。综合来看,台农1号芒果以第2次生理落果后尽早套袋为佳。 相似文献
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套袋时期对‘立冬本’龙眼果实生长发育和品质的影响 总被引：3，自引：0，他引：3
以福建省晚熟龙眼品种'立冬本'果实为材料,研究果实采前套袋时期(盛花后80、95、110d)对龙眼果实生长发育、外观品质及果肉内在品质的影响.结果表明:果实采前套袋时期越早,则落果率越高;果实采前3个不同套袋时期都可以增加果实纵径、横径和单果重,提高果皮叶绿素、类胡萝卜素、花色素苷和类黄酮含量,以及果肉的可溶性固形物、总糖、维生素C和可溶性蛋白质等营养物质含量,降低可滴定酸含量.综合研究结果认为.'立冬本'龙眼果实的最佳套袋时期为盛花后110d.即果实采收前1个月左右. 相似文献
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为探讨适用于高温高湿地区的火龙果果袋,以红皮红肉型‘桂红龙2号’火龙果为材料,测定5种不同类型果袋套袋后袋内温湿度日变化及对火龙果果实品质、果实病害以及采后果实失水率等的影响。结果表明,套袋后袋内温度升高速度更快,白天袋内温度均显著高于对照;套袋使果皮变薄,增加可食率,促进了果皮鳞片转红,以牛皮纸袋为最高;套袋显著增加了果皮与果肉的色素含量;显著增加了果实可溶性固形物含量,不同程度的提高了葡萄糖和果糖的含量;但套袋也提高了果实苹果酸及柠檬酸的含量。套袋总体上降低了采后水分散失的程度,白色纸袋和无纺布袋有利于降低采后病害发生率,延长货架期。除黑色尼龙网袋以外,套袋均提高了果实煤烟病的发病率。综上,在广西南宁周边高温高湿地区,可使用黑色尼龙网袋,有利于防止鸟啄和虫害,或使用白色纸袋和无纺布袋,有利于延长货架寿命,但采收后要注意煤烟斑的清洗。 相似文献
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以福建省晚熟龙眼品种‘立冬本’果实为材料,研究果实采前套袋时期（盛花后80 d、95 d、110 d）对龙眼果实品质和采后贮藏特性的影响。结果表明：果实采前3个不同套袋时期都可以可明显改善龙眼果实的外观品质,提高果肉可溶性固形物、总糖、维生素C和可溶性蛋白质等营养物质含量,降低可滴定酸含量。果实采前套袋提高了与龙眼果皮褐变密切相关的总酚含量和过氧化物酶活性,促进龙眼果实贮藏期间果皮褐变的发生;同时,果实采前套袋促进龙眼果实采后果肉自溶和病害发生,降低果实耐贮性,缩短龙眼果实贮藏期。综合研究结果认为,果实采前套袋能有效改善‘立冬本’龙眼果实的外观品质和营养品质,其最佳套袋时期为盛花后110 d（即果实采收前1个月左右）;但果实采前套袋降低‘立冬本’龙眼果实的耐贮性,不利于延长龙眼果实贮藏期。 相似文献
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采前套袋时期对‘立冬本’龙眼果实品质和采后贮藏特性的影响 总被引：3，自引：0，他引：3
以福建省晚熟龙眼品种‘立冬本’果实为材料,研究果实采前套袋时期(盛花后80 d、95 d、110d)对龙眼果实品质和采后贮藏特性的影响.结果表明:果实采前3个不同套袋时期都可以可明显改善龙眼果实的外观品质,提高果肉可溶性固形物、总糖、维生素C和可溶性蛋白质等营养物质含量,降低可滴定酸含量.果实采前套袋提高了与龙眼果皮褐变密切相关的总酚含量和过氧化物酶活性,促进龙眼果实贮藏期间果皮褐变的发生;同时,果实采前套袋促进龙眼果实采后果肉自溶和病害发生,降低果实耐贮性,缩短龙眼果实贮藏期.综合研究结果认为,果实采前套袋能有效改善‘立冬本’龙眼果实的外观品质和营养品质,其最佳套袋时期为盛花后110 d(即果实采收前1个月左右);但果实采前套袋降低‘立冬本’龙眼果实的耐贮性,不利于延长龙眼果实贮藏期. 相似文献
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为减少降雨对火龙果产量造成的损失,探索红肉型火龙果雨季授粉技术,比较了不同降雨类型气候条件下,套袋授粉和自然授粉对火龙果产量和品质的影响.结果表明,与自然授粉相比,红肉型火龙果雨季套袋授粉后,座果率提高18.89％～51.67％,平均单果重提高181.79～201.77 g,增产23006.55～27073.95 kg/hm2,为自然授粉处理的2.63～4.19倍;套袋授粉还促进了火龙果的果实发育,增加了一、二级商品果比率,每公顷比对照净增收18.92～20.62万元,增幅达240.7 ％～433.2％,大幅提升了火龙果种植效益,同时对火龙果的内在品质无影响.雨季套袋授粉在生产上是简便、有效、经济、可操作性强的一项技术措施. 相似文献
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Shade effects on coffee rust are controversial, possibly because shade helps to prevent high fruit loads, which decreases leaf receptivity to the pathogen but, at the same time, might provide a better microclimate for germination and colonization. These two probable antagonistic pathways are combined under natural conditions. In order to clarify their individual effects, we dissociated the two factors by manually homogenising fruit loads under two light exposure situations, under shade and in full sunlight. The trial was set up in Turrialba, Costa Rica at 600 m of elevation, in a coffee plot initially under shade provided by the tree legume Erythrina poeppigiana. The plot was subdivided into two subplots: one was maintained under shade, whereas shade was eliminated in the second subplot. In each subplot, we removed fruiting nodes from 40 coffee plants in order to obtain the following four levels: none, 150, 250, and 500 fruiting nodes per coffee plant. Coffee rust incidence and severity, along with plant growth and defoliation, were assessed on these coffee plants over a period of two years. Air and leaf temperatures, leaf wetness and relative humidity were also monitored. As expected, the intensity of the coffee rust epidemic increased in line with fruit load. We quantified a 28.9% increase in coffee rust incidence and a 129.2% increase in severity on plants with 500 fruiting nodes as compared to plants with no fruits. With the homogenised fruit load, the intensity of the coffee rust epidemic was greater in the shaded subplot, with a 21.5% increase in incidence and a 22.4% increase in severity. Two mechanisms were suggested. Firstly, we highlighted a dilution effect due to host growth which was 25.2% and 37.5% greater in full sunlight when considering new leaves or new leaf area respectively. Secondly, the microclimate was more conducive to coffee rust under shade, with lower intra-day temperature variations, due to lower maxima, and a higher leaf wetness frequency. We concluded that shade has antagonistic effects on coffee rust. Coffee rust is reduced by shade because shade reduces the fruit load. However, with an equivalent number of fruiting nodes, coffee rust incidence and, to a lesser extent, severity were greater under shade. The service provided by shade in controlling coffee rust is necessarily associated with a disservice that consists in reducing yield in the short term. 相似文献