Effect of doses and location of NPK fertilization on the mineral composition of Jonathan apples
Department of Pomology
Leszczyńskiego 58, 20-068 Lublin, Poland
In 1980-1994 Jonathan apple trees on M 4 rootstock were fertilized with
varied NPK doses: a low dose of 50 kg N + 25 kg P2O5
+ 100 kg K2O) ha-1,
a medium one of 100 kg N + 50 kg P2O5
+ 200 kg K2O ha-1,
and a high dose of 150 kg N + 75 kg P2O5
+ 300 kg K2O ha-1.
Each dose was applied annually one the entire area of the experimental
plots (tree rows and interrows) or only in strips of herbicide fallow in
tree rows 1.5 m in width. The sward in the interrows was mown and mulched
on the ground. Non-fertilized trees constituted the control. In 1982-1994
the effect of NPK doses and their location on the content of mineral
constituents in the apples was investigated. The greatest differences in
N, K, and P content occurred between the fertilized treatments and the
control, i.e. an increase in N and K content and decrease in that of P
were affected by the fertilization, especially by the highest NPK dose.
Within the fertilized treatments differences in the content of these
constituents in the apples were smaller. The level of Ca and Mg did not
depend upon NPK fertilization. The level of N, K, Ca, and Mg in the apples
was similarly affected by overall fertilization and by that applied to the
strips of herbicide fallow in the tree rows. The content of P was greater
in the case of fertilization applied to the tree rows.
Szwedo J., 1996. Effect of doses and location of NPK fertilization on the mineral
composition of Jonathan apples. Folia Horticulturae 8/2: 3-11.