7 - MSB-1423-2014v5n7页

基本HTML版本

Molecular Soil Biology 2014, Vol. 5, No. 7, 1-9
http://msb.biopublisher.ca
4
(AOAC, 1985) at the Central Laboratory of National
Institute for Oil Palm Research (NIFOR), Nigeria.
2.9 Statistical analysis
Data were subjected to single factor ANOVA and
means were separated with Tukey Honest Significant
Difference (HSD) test using SPSS version 17.0
software (SPSS Inc., Chicago, IL, USA) at 95% level
of significance.
3 Results
The soil had 5.60 pH, 6.19% clay, 4.29% silt, 89.7%
sand, 2.89% C, 0.14% N, 9.02 mg/100 g P, 6.24
mg/100g Ca, 1.84 mg/100 g Mg, 0.34 mg/100 g Na,
0.23 mg/100 K, 0.20 mg/100 g H and 8.86 mg/100g
CEC. No significant differences (P > 0.05) between
soil amendment treatments and control were found on
stem girth, leaf area and root length (Table 1). Plants
subjected to soil amendments had higher values for
other growth parameters than in control. Stem length,
number of leaves and number of branches in plants
amended with soil conditioner (T
3
) were higher than
in control (T
0
), but at a non-significant level (P > 0.05).
Plants under T
1
and T
2
did not differ (P > 0.05) from
each other, but had significantly higher values for
stem length, number of leaves and number of branches
than the control. Both organic and inorganic fertilizers
in combination with soil conditioner showed the
highest growth (Table 1). T
4
and T
5
did not differ (P >
0.05) from each other, but were significantly (P < 0.05)
higher than in other soil amendment treatments. Root
number and root nodules differed significantly (P <
0.05) from control in plants grown in amended soils
(Table 1). Sole application of inorganic and organic
fertilizers increased the relative growth rate and
root/shoot ratio of Arachis hypogaea over the control
but at a non-significant (P > 0.05) level (Figure 1).
Inorganic and organic fertilizers in combination with
soil conditioner however increased both parameters
significantly (P < 0.05) above those planted in soils
that were not amended (T
0
).
Table 1 Growth parameters of
Arachis hypogaea
grown in soil amended with organic and inorganic NPK fertilizers, and organic soil
conditioner
Treatment
Growth parameters
T
0
T
1
T
2
T
3
T
4
T
5
Stem length (cm)
14.40
c
22.50
b
20.40
b
17.80
bc
28.90
a
26.40
a
Number of leaves/plant
94.20
c
128.20
b
122.40
b
100.40
c
148.80
a
143.60
a
Number of branches
7.80
c
13.20
b
11.60
b
8.80
bc
16.80
a
17.20
a
Leaf area (cm
2
)
6.41
a
6.94
a
6.65
a
6.17
a
6.32
a
6.47
a
Stem girth (cm)
1.41
ab
1.51
a
1.53
a
1.52
a
1.53
a
1.48
a
Root length (cm)
52.30
a
53.40
a
51.40
a
47.30
a
54.80
a
52.00
a
Root number
17.20
b
26.20
a
28.80
a
22.60
a
27.60
a
28.80
a
Number of root nodules
92.10
b
110.31
a
124.10
a
103
a
123.23
a
128.71
a
Notes: Each value is a mean of 5 replicates. For each parameter, means with the same letter(s) in superscript on the same row are not
significantly different at P > 0.05 (Tukey HSD test). T
0
= no soil amendment, T
1
= 100% inorganic NPK fertilizer, T
2
= 100% organic
NPK fertilizer, T
3
= 100% organic soil conditioner, T
4
= 50% inorganic NPK + 50% organic soil conditioner, T
5
= 50% organic NPK
+ 50% organic soil conditioner
Leaf total chlorophyll was not affected by soil
amendments (Figure 2). Leaf, stem and root mass
were greater under amended soils than in control, and
the highest values were obtained at inorganic + soil
conditioner (T
4
) and organic + soil conditioner (T
5
)
(Table 2). Among the dry matter variables, only root
mass did not show a significant (P > 0.05) increase
between the soil amendment treatments and control.
Leaf mass was significantly higher (P < 0.05) in T
1
, T
2
,
T
4
and T
5
but did not differ significantly (P > 0.05) in
T
3
, compared to the control. However, stem mass and
total biomass in T
1
and T
2
were significantly higher (P
< 0.05) while T
3
was not significantly different (P >
0.05) in comparison to the control. Addition of soil
conditioner to inorganic fertilizer (T
4
) and organic
fertilizer (T
5
) further produced values of stem mass
and total biomass that were considerably higher than
in other soil amendment treatments (Table 2).