Effects of Different Quantities of Fulvic Acid Combined Application with Microbial Fertilizer on Corn Growth, Nutrient Accumulation and Photosynthetic Characteristics at Seedling Stage

【Objective】 This project aims to perform pot experiments in greenhouses with the view of exploring the effects of different quantity of fulvic acid combined application with microbial fertilizer on the growth of corn and selecting the best quantity, thus providing theoretical basis for replacing part of chemical fertilizer with microbial fertilizer of fulvic acid microbial fertilizer. 【Methods】 A single-factor randomized block test was adopted, and a total of 6 fertilization treatments were set up. By measuring the plant height, stem thickness, chlorophyll value (SPAD), dry matter quality, nutrient accumulation, and photosynthetic characteristics of seedlings, the effects of different quantity of fulvic acid microbial fertilizer on the corn growth was analyzed. 【Results】 The application quantity of fulvic acid was 150-225 kg/hm ² combined with the application of 15 kg/hm ² microbial fertilizer, the agronomic performance of corn was the best. When the application quantity of fulvic acid was 225 kg/hm ², the plant dry matter quantity and the accumulation of N, P, K reached the maximum value, the dry matter quantity increased by 28.81 g/plant compared with CK, an increase of 138.9%, and the accumulation of N,P,K in the aboveground increased by 138.9%, 276.2%, and 117.8% compared with CK. PN, TR, GS of FA150 treatment and FA225 seedling stage treatment were higher than those of other treatments. 【Conclusion】 The comprehensive analyses demonstrate that FA150 and FA225 treatment can promote the growth, nutrient accumulation and photosynthesis of corn seedlings. The best application quantity of fulvic acid is 150-225 kg / hm ² combined application with 15 kg / hm ² microbial fertilizer.