  Our research conducted in an area characterized by alkaline, lime-abundant
soils investigated the potential of utilizing phosphorus fertilizer and humic
acid to enhance phosphorus absorption in sugarcane crops. The results indicated
that the application of phosphorus fertilizer significantly increased the total
and bioavailable phosphorus in the rhizospheric soil, despite observing a
decrease in phosphatase enzyme activity. An important observation was the
considerable growth of active carbon, a crucial soil health indicator, under
the influence of humic acid treatments. The findings also demonstrated an
enhancement in phosphorus absorption by sugarcane due to the synergistic
application of humic acid and phosphorus fertilizer at both harvest periods.
Interestingly, humic acid treatments, when applied through immersion, were
found to be more effective than soil applications, implying a greater impact on
root absorption processes. The findings underline the potential of integrating
humic acid into sugarcane cultivation for better phosphorus absorption. Our
study offers valuable insights for improved soil management strategies, and
could potentially pave the way towards more sustainable agricultural practices.
However, we also recommend further investigation into alternative methods of
humic acid application and its usage at different stages of plant growth. Such
exploration could provide a comprehensive understanding of the potential
benefits and most effective utilization of humic acid in agriculture,
especially in regions with similar soil characteristics as West Azarbaijan,
Iran
