Agriculture Reference
In-Depth Information
Table 17.15 Effect of applied P on grain yield (Mg/ha) of mung bean on the three soils.
Target P
conc. (mg/L)
Sandy clay loam
Clay loam
Sandy loam
kg P/ha
Grain yield
kg P/ha
Grain yield
kg P/ha
Grain yield
Control
0
0.487 i
0
0.492 h
0
0.309 h
0.05
38
0.611 h
39
0.714 g
28
0.394 g
0.10
53
0.731 g
46
0.774 f
35
0.452 f
0.15
58
0.780 f
57
0.833 e
51
0.536 e
0.20
67
0.886 e
68
0.910 d
56
0.575 d
0.25
71
1.034 b
73
1.076 b
63
0.624 c
0.30
82
1.138 a
84
1.191 a
69
0.691 b
0.35
84
1.023 bc
97
1.063 b
76
0.732 a
0.40
91
0.994 cd
113
0.995 c
82
0.650 c
0.50
94
0.981 d
121
0.985 c
87
0.619 c
Means sharing same letters are statistically ≤5% level of probability.
Table 17.16 Effect of applied P on protein content of mung bean on the three soils.
Target P
conc. (mg/L)
Sandy clay loam
Clay loam
Sandy loam
kg P/ha
Protein content (%)
kg P/ha
Protein content (%)
kg P/ha
Protein content (%)
Control
0
21.74 e
0
21.58 e
0
20.94 d
0.05
38
21.92 de
39
21.73 de
28
21.41 d
0.10
53
22.19 cd
46
21.93 de
35
22.07 c
0.15
58
22.37 c
57
22.04 d
51
22.31 bc
0.20
67
22.74 b
68
22.56 c
56
22.46 bc
0.25
71
23.01 b
73
23.01 b
63
22.79 ab
0.30
82
23.56 a
84
23.46 a
69
22.74 ab
0.35
84
23.42 a
97
23.52 a
76
23.15 a
0.40
91
22.90 b
113
23.04 b
82
22.44 bc
0.50
94
22.77 b
121
22.89 bc
87
22.12 c
Means sharing same letters are statistically ≤5% level of probability.
was developed by adding 84 kg P/ha in clay loam soil,
whereas in case of sandy loam soil the maximum pro-
tein yield of 23.15% was obtained at a solution P level
of 0.35 mg/L, which was developed by adding 76 kg
P/ha. Increase in grain protein contents might be due to
enhanced uptake and translocation of nitrates, which
provide nitrogen for amino acid synthesis. Moreover, P
is involved in the synthesis of ATP, which is required in
nitrogen uptake and protein synthesis.
reserved for P depletion studies. No data were reported
in this experiment for depletion studies. For P build-up,
adsorption isotherms were constructed for site-specific
fertilizer application to achieve the same soil solution P
levels as were developed previously for first berseem and
second mung bean crops. Linear forms of the Freundlich
equation were used for computing P fertilizer doses
(Tables 17.17, 17.18 and 17.19). It was observed that the
rates of P doses decreased still further for the second ber-
seem crop due to P build-up in the soil.
It was residual P that caused this decreased adsorption
in the soils. The P doses required to develop the same
soil solution levels were greatest in clay loam soil fol-
lowed by sandy clay loam and sandy loam soils. The rate
17.3.10 response of berseem to applied p
The number of replications was six in this study at the
start of the experiment. Three replications were meant
for P build-up studies and the remaining three were
 
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