Agriculture Reference
In-Depth Information
Table 17.6
Green fodder yield in ive cuttings of berseem (1st crop) on clay loam soil.
Target P
conc. (mg/L)
P (kg/ha)
Yield (Mg/ha)
1st cut
2nd cut
3rd cut
4th cut
5th cut
Total
0.00
0
13.22 g
18.29 g
19.42 g
20.21 g
16.20 g
87.45 g
0.05
58
14.71 f
21.36 f
22.67 f
23.36 f
19.45 f
101.54 f
0.10
78
15.18 f
23.88 e
25.33 e
26.49 e
21.52 e
112.40 e
0.15
83
17.44 e
25.36 d
27.52 d
28.23 d
22.92 d
121.47 d
0.20
105
19.03 cd
27.20 c
29.20 c
29.42 c
24.31 c
129.16 c
0.25
116
20.72 a
28.48 b
30.23 bc
30.56 b
25.26 c
135.24 b
0.30
125
19.91 b
30.28 a
31.22 ab
31.09 b
27.35 b
139.84 a
0.35
133
19.43 bc
30.15 a
31.97 a
31.97 a
28.31 ab
141.83 a
0.40
141
19.03 cd
29.13 b
30.24 bc
32.12 a
29.15 a
139.68 a
0.50
155
18.33 d
28.60 b
30.06 c
30.71 b
27.96 b
135.65 b
CV (%)
3.47
3.27
3.51
2.15
4.21
1.68
LSD
0.715
0.998
1.134
0.709
1.187
2.438
Means sharing same letters are statistically ≤5% level of probability.
CV, coefficient of variation; LSD, least significant difference between treatment means.
in the remaining cuts (third, fourth and fifth) the
maximum yield was observed at the solution level of
0.35 mg P/L, which was achieved by adding 100 kg
P/ha. The statistical analyses indicate that the maxi-
mum total green fodder yield, i.e. 116.51 Mg/ha, was
obtained at a soil solution level of 0.30 mg P/L, which
was achieved by adding 92 kg P/ha in sandy clay loam
soil. Higher rates could not further increase the yield
significantly.
17.3.3.3 Sandy loam soil
In the case of sandy loam soil, the maximum yield from
the first and second cuts was observed at a solution level
of 0.30 mg P/L, which was achieved by adding 89 kg
P/ha, whereas the maximum yield from the third cut
was obtained at a solution level of 0.35 mg P/L, which
was achieved by adding 94 kg P/ha, while in the remain-
ing cuts (fourth and fifth) maximum yield was observed
at the solution level of 0.40 mg P/L, which was achieved
by adding 99 kg P/ha (Table 17.7). The maximum total
green fodder yield of 110.34 Mg/ha was obtained at a
soil solution P level of 0.30 mg/L, which was developed
with the application of 89 kg P/ha; higher rates could
not improve the yield significantly. Yield increased in
fertilized plots up to a solution level of 0.30 mg P/L, indi-
cating a positive response of berseem to P application.
This indicates low fertilizer P recovery in alkaline and
calcareous soils, and there is also general consensus that
applied P is fixed in soil because of the soil's calcareous-
ness and clay content. It was observed that the P
required to adjust the same solution P levels was much
higher for clay loam as compared to sandy loam soil.
The rate of fertilizer P applied was comparatively low
in sandy loam soil because adsorption was less due to
less clay and CaCO
3
contents and thus more P remained
in solution form. It can be noted that green fodder yield
17.3.3.2 Clay loam soil
In the case of clay loam soil (Table 17.6), the maximum
yield from the first cut was obtained at the solution
level of 0.25 mg P/L, which was achieved by adding
116 kg P/ha; the maximum yield from the second cut
was obtained at the solution level of 0.30 mg P/L,
which was achieved by adding 125 kg P/ha; with the
third and fourth cuts the maximum yield was obtained
at the solution level of 0.35 mg P/L, which was achieved
by adding 133 kg P/ha, while in the fifth cut the
maximum yield was observed at the solution level of
0.40 mg P/L, which was achieved by adding 141 kg
P/ha. The maximum total green fodder yield of
139.84 Mg/ha was obtained at a soil solution P level of
0.30 mg/L, which was achieved with the application of
125 kg P/ha.
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