Agriculture Reference
In-Depth Information
3.2.2. Chlorophyll content of tobacco leaves
Fig. 5 showed the dynamic changes of chlorophyll content in tobacco leaves under different
treatments more visually, chlorophyll content in tobacco leaves was decreased with a higher
rate at the later growth stage. The chlorophyll content of tobacco leaves with water-retaining
agent was slightly lower than that with no water-retaining agent, at 63 d after transplanted,
the chlorophyll content of tobacco leaves under different treatments was recorded as 1.69 mg/
g-1.85 mg/g; at 87 days after transplanted, the chlorophyll content of tobacco leaves was in the
lowest level of 0.97 mg/g-1.12 mg/g.
2
1.6
m
g
/
g
CK
P1
P2
P3
P4
P5
P6
C
h
l
o
r
o
p
h
y
l
l
c
o
n
t
e
n
t
1.2
0.8
0.4
0
63d 69d 75d 81d 87d
Days after transplanted
Figure 5.
The changes of chlorophyll content in tobacco leaves varying with days after transplanted
3.2.3. Dry matter accumulation
Table 6 showed the dry matter accumulation of different tobacco organs and the total yield
under different treatments. From the table it was found that the dry matter amount of leaf and
stem and root in P4 was the highest, recording as 73.6 g, 88.1 g and 164.9 g respectively. The
dry matter amount of leaves with water-retaining agent treatments were 4.99%-14.28% higher
than that with no water-retaining agent application. Under the same amount of water--
retaining agent application, EM-calcium spray in root-extending stage was much better than
that in other stages. Dry matter amount of leaf in P1 and P4 was higher than that of other
treatment, and the tobacco yield of P4 was highest, recording as 2473.5 kg/hm
2
, followed closely
by P6, which of P2 was the lowest.
