In a long-term field fertilization experiment on calcareous sandy soil
, studies were made on the dynamics of nutrient accumulation in the ab
oveground parts of the grain sorghum variety Alfoldi F 1. Specific nut
rient contents were calculated. Plant samples were taken from an area
of 0.36 m(2) in the major phenophases on a total of six occasions duri
ng the vegetation period. The following conclusions can be drawn from
the results. Among the macroelements, the accumulation of N, P, K, Ca,
Na, S and Mg was continuous, though at differing rates, throughout th
e vegetation period. Of the micronutrients, the accumulation of Mn, Zn
and B proved to be continuous up to harvesting, while Fe and Cu were
accumulated up to flowering, after which element loss, or reflux, was
observed. The intensive phase of accumulation, when the sorghum plant
accumulated the larger part of the total quantities absorbed, occurred
after flowering for N, P, K, Mg, S and Mn and during the flowering ph
enophase for Ca Fe, Zn, Cu, B and Na. The effect of N, P and K fertili
zers in increasing the accumulation of all the elements was significan
t over the average of the green plant samples in the NP and NPK treatm
ents. At harvesting, fertilization caused significant differences in t
he quantities of N and P in the grain yield, and of K, Fe, Mn and Cu i
n the straw yield compared to the unfertilised control. At full maturi
ty the majority of the N, P, S and Zn was found in the grain, and that
of K, Ca Mg, Fe, Mn, B and Na in the vegetative parts, while Cu was f
ound in roughly equal proportions in both parts. The specific nutrient
content of 1 t grain yield + the relevant by-products averaged 26 kg
N, 2.9 kg P, 10.8 kg K, 10 kg Ca, 5.2 kg Mg, 1.4 kg S, 142 g Fe, 73 g
Mn, 28 g Zn, 6.8 g Cu and 4.8 g B in the grain sorghum variety Alfoldi
F 1.