Effects Of Fertilization On The Relationship Between Functional Traits And Photosynthetic Rate, Fruit Yields Of Tomato

In recent years, as the tomato industry growing rapidly the higher yields were pursuit constantly at home and abroad. Therefore, the research to improve the production of tomato fruit became more and more important. By using outdoor pot experiments, the effects of fertilization on the relationship between functional traits, including relative growth rate, specific leaf area, leaf dry mass content, plant height and root mass per unit leaf area, and photosynthetic rate, fruit yields of tomato were investigated. The results indicated that three kinds of tomatoes not only had significant differences in relative growth rate, specific leaf area, leaf dry mass content, plant height and root mass per unit leaf area, but also in photosynthetic rate, therefore the fruit yields also varied grealty. Fertilization have effectively influence on each functional traits, photosynthetic rate and fruit yields, also affect the relationship between them. As a result of promoting the nutrients absorption and dry matter accumulation, applying N could significantly improve the relative growth rate, specific leaf area, leaf dry mass content and plant height, but decrease the root mass per unit leaf area. P fertilization, however, had no such effects. In despite of applying N and P both had no significant effects on photosynthetic rate, they had obviously effects on the fruit yields. Simple correlation analysis indicated that photosynthetic rate was closely related to relative growth rate (y=72.338x+5.5245, R2=0.8678), specific leaf area (y=0.1175x-6.0404, R2=0.7561) and leaf dry mass content (y=0.1488x-13.947, R2=0.7115). While fruits yield related positively to relative growth rate (y=3853.2x+1257, R2=0.5047) and specific leaf area (y=11.209x-177, R2=0.7489). But the results of multiple stepwise regression analysis was different. There were significant linear relationship only between fruit yield and relative growth rate, and specific leaf area. There were no significant relationship between fruit yields and other function traits. It prove that when discusse the relationship between function trait and productivity of tomato, it is important to consider not only the single trait, but also the multiple traits.