In a long-term sand amelioration trial set up on calcareous, slightly
humus sand, the after-effect of soil cultivation and nutrient supply w
as investigated in grain sorghum and peas. The changes in soil propert
ies, the development of nutrient content and nutrient uptake in the yi
eld were studies, the specific N, P, K, Ca and Mg contents were calcul
ated. Based on the results the following conclusions may be drawn: The
phosphorus fertilization applied over many years generally with maint
aining rates made the readily available AL-soluble phosphorus content
of the soil continuously richer, and increased it in 1991 to the well
supplied soil level, and even to the very well supplied one, when the
higher phosphorus rates were applied. The maintaining potassium fertil
ization through many years, generally at a rate of 100 kg/ha K2O, only
approximated the moderately supplied level, and remained at poor leve
l. The effect of different soil cultivations shallow and deep ploughin
gs, and of Egerszegi's deep fertilization cannot be proved in the pers
pective of more than 30 years. The nitrogen fertilization applied in i
tself seemed to be ineffective in both crops The nitrogen and phosphor
us fertilizations jointly applied were the most effective in both crop
s and both years. The potassium effect was minimal due to the poor sup
ply of the soil and was not significant even in the straw yields. The
droughty weather decreased, especially in 1990, the efficiency of fert
ilization, even more so in phosphorus-deficient treatments.