关键词: 遮阴, 开花率, 坐果率, 落花率, 落果率, 产量

Abstract: In order to study the flowering and fruit setting characteristics and yield changes of tomatoes under different shading days, the infinite-growth-typed tomatoes ‘Power Corolla’ was chosen as experimental material, and five shading treatments of tomatoes were set in solar greenhouse during the flowering and fruiting period, including T1 (3-day shading), T2 (6-day shading), T3 (9-day shading), T4 (12-day shading) and T5 (15-day shading), and the growth of tomatoes under natural light in solar greenhouse was used as the control test (CK). The results indicate that the number of flowering and fruit setting of tomatoes decreased by 22.2% and 26.7% after 15-day shading, respectively, and the first time of flowering and fruit setting delayed by 4.2 and 4.2 days, respectively. Compared with CK, the maximum daily number of flowering and fruit setting of tomatoes decreased during the shading, and their corresponding dates delayed. Moreover, the beginning and ending dates of fast growth point of tomatoes flowering delayed after the shading, but the difference wasn’t significant, while the beginning and ending dates of fast growth point of tomatoes fruit setting delayed significantly under the shading conditions with 3-day and 12-day and above. The rate of flowering and fruit setting of tomatoes decreased gradually with the increase of shading days, but that of tomatoes under the shading with 12-day and below could gradually recover to CK state after the regaining normal light. The shading with 3-day and above could significantly increase the rate of flower falling, abnormal fruit and diseased fruit of tomatoes, while that with 6-day and above could significantly increase the rate of fruit dropping of tomatoes. The yield of tomatoes was negatively correlated with the shading days, and the yield of tomatoes under the shading with 6-day and above was significantly different from CK during the harvest stage.

Key words: shading, flowering rate, fruit setting rate, falling flower rate, fruit shedding rate, yield