Molecular Characterization of Size-Fractionated Humic Acids Derived from Lignite and Its Activation of Soil Legacy Phosphorus and Lactuca sativa Growth-Promoting Performances
Abstract:Humic acid (HA) has been widely used in agricultural
production
processes because it improves soil nutrients and has a growth-promoting
effect on plants. Understanding the relationship between the structure
and function of HA is the key to efficient utilization of HA in the
field of activating soil legacy phosphorus (P) and promoting crop
growth. In this work, HA was prepared using lignite as raw materials
by the ball milling method. Moreover, a series of HAs with different
molecular weights (<10, 10–50, and >… Show more
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