Agriculture Reference
In-Depth Information
Table 17.12
Model-based P rates for mung bean for sandy clay
loam soil.
Table 17.14
Model-based P rates for mung bean for sandy
loam soil.
Target P
conc. (mg/L)
Regression equation
R
2
Rate
(kg P/ha)
Target P
conc. (mg/L)
Regression equation
R
2
Rate
(kg P/ha)
P
P
2
O
5
P
P
Control
Control
-
0
0
Control
Control
-
0
0
0.05
y
= 0.4139
x
+1.8255
97
**
38
87
0.05
y
= 0.6167
x
+1.9447
0.97
**
28
64
0.10
y
= 0.4106
x
+1.8362
0.97
**
53
121
0.10
y
= 0.6534
x
+1.9005
0.98
**
35
80
0.15
y
= 0.4253
x
+1.8149
0.94
**
58
133
0.15
y
= 0.6204
x
+1.9146
0.98
**
51
117
0.20
y
= 0.4176
x
+1.8188
0.95
**
67
153
0.20
y
= 0.6411
x
+1.8941
0.98
**
56
128
0.25
y
= 0.4294
x
+1.8105
0.96
**
71
163
0.25
y
= 0.646
x
+1.8897
0.98
**
63
144
0.30
y
= 0.4149
x
+1.8274
0.95
**
82
188
0.30
y
= 0.617
x
+1.9447
0.97
**
69
158
0.35
y
= 0.4194
x
+1.8169
0.94
**
84
192
0.35
y
= 0.6565
x
+1.877
0.97
**
76
174
0.40
y
= 0.4184
x
+1.8232
0.94
**
91
208
0.40
y
= 0.657
x
+1.8764
0.98
**
82
188
0.50
y
= 0.4246
x
+1.8002
0.93
**
94
215
0.50
y
= 0.6744
x
+1.8408
0.99
**
87
199
**
Significant at
P
= 0.05.
**
Significant at
P
= 0.05.
Table 17.13
Model-based P rates for mung bean for clay loam
soil.
17.3.8 Grain yield of mung bean (second
crop)
The data regarding grain yield of mung bean as affected
by different P concentrations in soil solution showed
(Table 17.15) that increasing the P level significantly
affected grain yield, and that the maximum grain yield
of 1.138 Mg/ha was obtained at a solution P level of
0.30 mg/L, which was achieved by adding 82 kg P/ha in
sandy clay loam soil. Further increases in the level of
fertilizer P could not improve grain yields of mung bean.
On clay loam soil chock-full grain yield of 1.191 Mg/ha
was obtained at a solution P level of 0.30 mg/L, which
was achieved by adding 84 kg P/ha. Whereas in case of
sandy loam soil a grain yield of 0.732 Mg/ha was
obtained at a solution P level of 0.35 mg/L, which was
achieved by adding 76 kg P/ha, but further increases in
the level of fertilizer P could not improve the grain yield
of mung bean. P regulates photosynthesis and carbohy-
drate metabolism and is considered one of the major
growth-limiting factors particularly during the repro-
ductive stage of the growth. These findings explain the
greater grain yield at higher P levels.
Target P
conc. (mg/L)
Regression equation
R
2
Rate
(kg P/ha)
P
P
Control
Control
-
0
0
0.05
y
= 0.501
x
+1.9393
0.95
**
39
89
0.10
y
= 0.5478
x
+1.9065
0.95
**
46
105
0.15
y
= 0.555
x
+1.9111
0.96
**
57
131
0.20
y
= 0.5784
x
+1.933
0.96
**
68
156
0.25
y
= 0.5894
x
+1.9126
0.95
**
73
167
0.30
y
= 0.5253
x
+1.8974
0.97
**
84
192
0.35
y
= 0.486
x
+1.9088
0.97
**
97
222
0.40
y
= 0.202
x
+1.9199
0.94
**
113
259
0.50
y
= 0.4183
x
+1.9079
0.94
**
121
277
**
Significant at
P
= 0.05.
increase of P application. Ayub
et al
. (2002) observed that
crude fibre contents increased with P application along
with N.
17.3.7 response of mung bean to applied p
Adsorption isotherms were again constructed for calcu-
lation of P rates in all three soils to achieve levels of
solution P as previously set. It was observed that the
rates of P decreased (Tables 17.12, 17.13 and 17.14) for
mung bean crops as compared to those for the first ber-
seem crops in all three soils.
17.3.9 protein content (%) of mung bean
The maximum protein content of 23.56% was obtained
at a soil solution P level of 0.30 mg/L, which was devel-
oped by adding 82 kg P/ha in sandy clay loam soil
(Table 17.16). The maximum protein content of 23.46%
was obtained at a solution P level of 0.30 mg/L, which
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