Effect Of Fulvic Acid On Growth, Yield And Photosynthetic Characteristic Of Tomato

This paper studied the effect of different FA concentration on photosynthetic rate, physiological characteristic, growth of tomato treated in seeding stage and the effect on yield and quality of tomato in fruit-setting stage. The results could be concluded as follows:1 Yield of tomato was significantly increased by foliar application of 500mg·L-1, 1000mg·L-1, and increased over the CK by 19.4%, 27.4% respectively. Additionally, fruit weight was significantly increased by all of the application.2 Vit.C of tomato was significantly increased by foliar application of 1 000mg·L-1, 2000mg·L-1 . The highest content of Vit.C was obtained from application of l000mg·L-1. Treatment with fulvic acid improved significantly brix-acid ratio of tomato, but applications of fulvic acid to tomato didn't statistically affect on dry matter and TSS.3 Treatment with fulvic acid in the seeding stage improved significantly fresh weight and dry weight of seedlings, also improved ratio of root to shoot and ratio of dry to fresh, and root length, plant height.415 days after spraying, all treatment improved the leaf chlorophyll content, VLM, and decreased significantly relative permeability of plasma membrane and WSD.5 Foliar application of 250mg·L-1 , 500mg·L-1 , 1000mg·L-1 FA increased net photosynthetic rate of tomato leaf, but application of 4000mg·L-1 decreased net photosynthetic rate 7 days after spraying.6 Treated with fulvic acid, the leaf water use efficiency was increased. The highest water use efficiency was obtained from application of 500mg·L-1 and the value up to 3.86μmolCO2·mmol-1H2O.7 Foliar application of fulvic acid to tomato didn't affect on diurnal changes of internal CO2 concentration, but affect on the diurnal changes of photosynthetic rate of tomato leaf blade and all treatment maintained higher photosynthetic rate at noon.8 Foliar application of fulvic acid didn't change the relationship, which was liner between photosynthetic rate and stomatal conductance, but decreased the value of stomatal conductance when the photosynthetic of leaf was the highest.