Agriculture Reference
In-Depth Information
tested had suffi cient active ingredients and that the producers maintained a
good quality over the four seasons (or 2.5 years). Theoretically, the effect
of the biofertilizers could also have been caused by non-living ingredients
but the applied amount was so small that even micronutrients could not ex-
plain the observed effects. Also, no micronutrient defi ciencies are known
from either of the two experimental sites.
TABLE 5:
Relative yield increase over the Control treatments with the same inorganic
fertilizer rate for all biofertilizers tested, in all seasons and at both experimental sites.
Season
Biofertil-
izer treat-
ment
***
Inorganic fertilizer treatment **
0% RR
25% RR
50% RR
100% RR
Mean
Relative yield increase (%) *
2008/09 DS
BG
-1
0
-1
7
1
BN
2
7
6
6
5
BS
7
3
-6
8
3
Control
-
-
-
-
-
2009 WS
BG
3
-1
23
10
9
BN
13
21
19
20
18
BS
5
9
12
24
13
Control
-
-
-
-
-
2010 WS
BG
28
1
9
-3
8
BN
24
7
20
2
12
BS
17
2
7
0
6
Control
-
-
-
-
-
2010/11 DS
BG
9
6
5
6
6
BN
5
14
12
5
9
BS
4
10
10
4
7
Control
-
-
-
-
-
* The relative yield increase was calculated for treatment means and in comparison to the
control without biofertilizer use but within the same inorganic fertilizer treatment; ** RR:
Recommended rate: 120-60-60 kg N-P
2
O
5
-K
2
O ha
−1
in the DS; 90-30-30 kg N-P
2
O
5
-K
2
O
ha
−1
in the WS; *** Biofertilizer treatments are described in detail in the text.
