Humic Acid Enhances Soil Fertility and Microbial Diversity Under Optimized Nitrogen Fertilization in Quinoa Rhizosphere.

ABSTRACT: Excessive nitrogen fertilization can degrade soil quality by inducing nutrient leaching, disrupting the microbial balance, and impairing plant reproductive growth, ultimately reducing crop yields. Optimizing nitrogen application rates and integrating humic acid fertilizers are promising strategies for enhancing soil fertility and improving agricultural productivity. The experimental design included four nitrogen application rates (N0:0 kg ha^-1, N1:120 kg ha^-1, N2:150 kg ha^-1, and N3:180 kg ha^-1) with and without humic acid (H: 1500 kg ha^-1). Key findings revealed that: (1) The combined application of humic acid (1500 kg ha^-1) and medium nitrogen (150 kg ha^-1) significantly increased the contents of soil organic ca

SUBMITTER: Guo Z 

PROVIDER: S-EPMC12736530 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature