Joint International Conference on Long-term Experiments ...

TOC %
1,2
1
0,8
0,6
0,4
0,2
0
bc b c c
bc bc
ab c
bcab
ab
ab ab
ab
ab ab
a aab
a
a
Cont
1FYM
2FYM
3FYM
1 eqv
2 eqv
3 eqv
1FYM+3eqv
4 eqv
Figure 2: TOC content of soil
1FYM+NPK
1eqv+NPK
Figures 3 and 4 show data about the long-term impact of organic or mineral
fertilization on the phosphorus and potassium content. FYM and equivalent NPK
influenced soil P and K content differently. While mineral NPK fertilization resulted in
22 mg kg -1 more P2O5 in the soil than FYM, K2O content of the soil in the FYM treated
plots was 26 mg kg -1 higher than in case of mineral fertilization.
In spite of the differences between the effect of the organic and mineral fertilizers,
it can be stated, that yearly14 t ha -1 FYM (70 t ha -1 5 yr -1 ) or equivalent PK fertilization
can keep soil P and K contents at the range of “medium-well-supplied”, taking into
consideration the absolute soil P and K levels.
P 2O 5
mg kg
250
-1
200
150
100
50
0
Cont
1FYM
2FYM
3FYM
1 eqv
2 eqv
3 eqv
1FYM+3eqv
4 eqv
Figure 3: AL-P2O5 content of soil
71
1FYM+NPK
1eqv+NPK