B. Lasztity, EFFECT OF FERTILIZER ON THE CONCENTRATION OF MICRONUTRIENTS IN MILLETDURING THE VEGETATION PERIOD, Novenytermeles, 46(3), 1997, pp. 275-280
In a long-term fertilisation experiment set up on calcareous sandy soi
l, studies were made on changes in the concentrations of the elements
Fe, Mn, Zn, Cu, B, Mo and Na in the whole aboveground parts of miller
(Panicum miliaceum L.) during the vegetation period. Plant samples wer
e taken from 0.98 square metres par plot in the six major developmenta
l phases. The analyses were carried out using the ICP technique. The f
ollowing conclusions can be drawn from the results: A decreasing trend
could be observed during the vegetative phase up to flowering in the
case of Fe, Mn, Cu and Na. The opposite was tone of Mo, where an incre
ase was recorded, while very little change was found for Zn and B. In
the generative phase the concentration of Fe, Mn, Zn and B increased,
while that of Ma declined. At maturity there was an accumulation of Zn
and Cu in the grain and high concentrations of Fe, Mn, B, Mo and Na i
n the straw. The effect of NPK fertilisation was significant at differ
ent times for different combinations. There was a significant increase
in Fe in the grain from flowering to full maturity, in the N, NP and
NPK treatments, and in Mn and Cu from heading onwards in the N and NP
treatments and at harvest in all the fertiliser treatments. in the cas
e of Zn there was a significant increase in the N treatment, but a sig
nificant decrease in the NP and NPK treatments compared to the untreat
ed control, due to P/Zn antagonism. NPK treatment led to a reduction i
n the B concentration in the straw and to that of Mo in the green plan
t and at harvesting. In the case of Na the increasing effect of potass
ium could only be proved in the green plant after heading. Element con
centrations in young plants can be used to determine limiting values f
or supply levels in Hungary.