Coupling Effects Of Different Light Quality And Nutrient Solutions On Growth、Production、Quality Of Tomatoes

The experiment explored how circumstances proportioned with different light quality and nutrient solutions affect the tomato’s growth both in seedling stage and fruiting stage, aiming at an appropriate match of light quality and nutrient solution for growing high-quality tomatoes under artificial controlled environment.The experiment was carried out from two aspects. One part focused on how circumstances proportioned with different lights and nutrient solutions affect the tomato’s growth in seedling stage. ‘Jinpeng No.1’was selected as test materials, compared with the controlled flourescent light(R/B=2: 3), we set up three light levels, R/B=7:1, R/B=3:1 R/B=1:1, and adopted two nutrient solutions, Yamasaki and Hoagland to carry out the experiment. The growth, physiology and photosynthetic indexes of seedlings in vegetative period were determined. The other part explored the effect on tomatoes in fruiting stage. The test material,light and nutrient solution are the same with that in seedling stage. Sunlight is taken as the control light. The yield and quality indexes were determined. This study means to find out the mechanism that variety light with different nutrient solutions affect tomatoes’ growth and its yield and fruit quality, to shed light on cultivating sound seedlings, improving yields and fruit quality. The findings are as below:1. Results at seedling stage: under environment proportioned with light and nutrient solution, the morphological growth, biomass allocation and photosynthetic indexes of the seedlings vary. As the ratio of red blue light increased, plant height and stem thickness increased; With T4, both fresh weight of the whole plant, fresh weight above the ground reached the peak; With CK, fresh weight underground, dry weight of the whole plant and root shoot ratio were at max, followed by the dry weight with T4; with control treatment, Photosynthetic pigment content reached the peak, while with T4, the Pn was at max. Gs, Tr get to the highest point with treatment T1, T2 and T3. We get the highest intercellular CO2 concentration with T2 and different Photosynthetic indexes at minimum with CK; Fv/Fo and Fv/Fm reached the peak with T4 while they were at the lowest point with CK; As the red blue light ratio increases, Fv/Fo and Fv/Fm increased initially and then decreased; ΦPSⅡ、qP、ETR reflected no significant difference under all the treatments except for T8. Findings above indicate that light with R/B=7:1 together with Hoagland can benefit tomato seedlings’ growth and improve its biomass.2. Results at fruiting stage: fruit diameter and fruit weight reached the peak, and they were at minimum with T5, showing significant differences with CK. With T4, T5, soluble protein content reached max, showing a decreasing trend as the red blue light ratio reduces. Nitrate nitrogen content was the highest under CK. The content of Vitamin C, lycopene reached the peak with T5. sugar-acid ratio were the highest with T2; as red blue light ratio decreased, the content of Vitamin C, lycopene sugar-acid ratio initially increased and then decreased. Findings above indicate that light with R/B=3:1 together with Hoagland can improve the fruit quality but reduce the fruit weight.3. Under artificial controlled environment, treatment proportioned with R/B=7:1 light quality together with Hoagland is suitable for tomatoes’ growth in seedling stage; while in fruiting stage, nutrient solution Hoagland combining R/B=3:1 light quality is a better match for improving the fruit quality.