Abstract: In this paper, the effects of silicon application on the photosynthetic characteristics and fruit quality of Siraitia grosvenorii were studied by setting 5 kinds of gradient silicon fertilizer as base fertilizer to provid basis for high quality and high yield of Siraitia grosvenorii in eastern Guizhou areas. The results showed that photosynthetic pigments(chlorophyll a, chlorophyll b and carotenoids), net photosynthetic rate, fruit size(longitudinal diameter and transverse diameter), dry weight of fruit and content of  Siraitia grosvenorii mogroside V all presented a tendency of  first increase then decline along with the increase in amount of silicon fertilizer. The net photosynthetic rate of Siraitia grosvenorii was improved significantly at 11∶00 am and 13∶00 pm, and the utilization coefficient of light energy was significantly improved by applying silicon fertilizer. Meanwhile, the application of silicon fertilizer could remarkably increase the single fruit dry weight and content of mogroside V. Silicon fertilizer had the best effect when the applying quantity was 150 g/plant, then the single fruit dry weight of Siraitia grosvenorii and its mogroside V content were increased by 10.6% and 16.1%, respectively than that of the contrast.

Key words: Siraitia grosvenorii, silicon fertilizer, photosynthetic characteristic, fruit quality

摘要： 设置5个梯度硅肥量作基肥，探讨硅肥对罗汉果叶片光合特性和果实品质的影响，为黔东地区罗汉果优质高产提供依据。结果表明：随着硅肥量的增加，罗汉果的光合色素（叶绿素a、叶绿素b和类胡萝卜素）、净光合速率、果实大小（纵径和横径）、果实干重、罗汉果皂苷V含量均呈先增加后减少的趋势；施硅肥能极显著提高罗汉果在上午11时和下午13时的净光合速率，提高罗汉果光能利用率；施用硅肥能显著提高罗汉果单果干重和罗汉果皂苷V的含量。硅肥量在150 g/株时效果最佳，罗汉果单果干重和罗汉果皂苷V的含量分别比对照增加10.6%和16.1%。

关键词: 罗汉果, 硅肥, 光合特性, 果实品质