Optimized preparation and high-efficient application of seaweed fertilizer on peanut

As a natural plat growth accelerator, seaweed fertilizer can be used as a good agricultural practice for sustainable and organic crop production. To investigate the effects of seaweed liquid fertilizer on the growth of peanut, the following experiments were carried out in 2020. Three types of seaweed liquid fertilizers were prepared by enzymatic hydrolysis with papain enzymatic and cellulase enzymatic. The peanut pot experiment was set up with five treatments (applying water, seaweed solution, papain enzymatic liquid fertilizer, cellulase enzymatic liquid fertilizer, two - mixed enzymatic liquid fertilizer). Relevant data about photosynthesis, agronomic traits and root system were measured. The results show that the overall growth of peanut fertilized with seaweed liquid fertilizer is better than that of the control group. Especially for the two-mixed enzymes enzymatic liquid fertilizer, the values of photosynthesis, leaf chlorophyll content, main stem height, lateral branch length and dry matter accumulation are all increased by 13.8%, 11.4%, 45.7%, 225.0% and 8.7% respectively, compared with the control group. Meanwhile, the promotion of peanut root morphology by spraying cellulase enzymatic liquid fertilizer was more pronounced. It increased by 156.7%, 103.0%, 58.3% and 101.9% in root length, root surface area, root volume and root tip number. This experiment provides a theoretical and experimental basis for the preparation of seaweed fertilizer. It also develops the utilization of seaweed resources.