The chemical properties of the soil outlined above are
consistent with those reported by Paramananthan (2000).
The low amount of humic molecules used (either HA
or FA) could be one of the reasons for the insignificant
results recorded for the dry matter production for
HA and FA treatments. According to Tan and
Nopamornbodi (1979), moderate amount of HA is
needed to promote root and shoot growth and development
in corn plants. It has been observed that addition
of N to P fertilizer enhances P uptake in plants (Miller,1965). Thus, the uptake of P relates to N availability.
The availability of N in the soil solution may have
played an important role in the P uptake. Generally, T4
showed higher P uptake when compared with other
liquid organic-N treatments. Thus, it can be concluded
that, this treatment could probably have more N when
compared with others.