Effect of Fertilizer Application on Watermelon Growth, Structure of Dissolved Organic Matter and Microbial Functional Diversity in Organic Substrates

Dissolved organic matter (DOM) is the immediate energy, carbon, and other nutrient substrates for microbial growth and, therefore, plays an essential role in agroecosystem biochemical processes. The aim of this study was to elucidate interrelationships among watermelon growth, DOM chemical characteristics, content, functional diversity soilless growing substrates. We analyzed effect no fertilizer application (CK), PK (PK), NPK (NPK) on fruit yield watermelon, structure, status, cultivated with watermelon. Compared CK, treatment resulted a significantly lower DOC concentration, higher DON NO3−-N concentration. decreased degree humification compared CK treatment. Our results demonstrate that quality important improving tightly related