Agriculture Reference
In-Depth Information
Application of Active EM-Calcium in Green Agricultural Production — Case Study in Tomato and…
http://dx.doi.org/10.5772/58329
3.2.6. Optimal selection of the best management scheme
Table. 7 showed the evaluation indexes of different treatments including the tobacco yield,
IWUE,
Ca content in tobacco leaves and the cost, among these indexes, the cost was calculated
based on the price list of raw materials provided by EMRO Limited Company, Nanjing Branch.
Table. 7 showed that the advantages and disadvantages of each treatment were distinct, taking
P1, P2 and P3 as example, although the cost of them was lower, the yield and
IWUE
were lower
than those of P4,P5 and P6; Ca content of tobacco leaves with P3 treatment was the highest,
reaching 2.546%, but the yield of P3 was not in the highest level. Therefore, a scientific
evaluation method was needed here to select the optimal management scheme.
IWUE
(kg/m
3
)
Ca
(%)
Cost
(USD/plant)
Treatment
Yield (kg/hm
2
)
CK
2164.5
0.54
2.131
0
P1
2221.5
0.56
2.454
0.0033
P2
2097.0
0.52
2.297
0.0033
P3
2197.5
0.55
2.546
0.0067
P4
2473.5
0.62
2.387
0.0167
P5
2272.5
0.57
2.224
0.0167
P6
2380.5
0.60
2.478
0.0200
Table 7.
Evaluation indexes
Modeling approach was shown below (Chen and Li, 2010; Chou et al., 2012):
Supposing that there were
n
evaluation indexes and
m
schemes,
m
schemes corresponding
with
n
indexes obtained the following matrix:
R
=(
r
ij
)
m
×
n
Where;
r
ij
is the
j
th
evaluation index of the
i
th
scheme. To
r
j
, there was information entropy:
m
E
j
=−
i
=1
p
ij
ln
p
ij
,
(
j
=1, 2, 3, …
n
)
And
P
ij
were calculated as the formula:
p
ij
=
r
ij
/
i
−
m
r
ij
The entropy value of
j
th
index was:
e
j
=
1
ln
m
E
j
,
(
j
=1, 2, 3, …,
n
)
