Joint International Conference on Long-term Experiments ...

K 2O mg kg -1
300
250
200
150
100
50
0
Cont
1FYM
2FYM
3FYM
1 eqv
2 eqv
3 eqv
1FYM+3eqv
4 eqv
1FYM+NPK
Figure 4: AL-K2O content of soil
1eqv+NPK
Figure 5 shows the crop yields expressed in cereal units and in the average of 1998-
2006.
t ha
8
7
6
5
4
3
2
1
0
-1
control
a
1FYM
b
2FYM
b
3FYM
c
Crop yields 1998-2006
1eqv
c
2eqv
d
3eqv
de
1FYM+3eqv
de
4eqv
de
1FYM+NPK
Figure 5: Crop yields (CU) t ha -1 1998-2006
e
1eqv+NPK
Despite the relative high soil P and K levels, neither 14 t ha -1 yr -1 nor 21 t ha -1 yr -1
FYM resulted in maximum yields. The organic fertilizer doses, (35; 70 and 105 t
FYM ha -1 5 year -1 ) increased grain yields to a lesser extent (by 0.66, 1.44 and 0.85 t ha -
1 , respectively), as compared to equivalent NPK doses. The average crop yield
amounted to 5.103 t ha -1 with FYM, while to 6.154 t ha -1 with equivalent NPK. The
increase was 28% as compared to the control, which was mainly due to the better
utilization of fertilizer.
72
e