Agriculture Reference
In-Depth Information
Table 5.9
Productivity and physical properties of corn stover harvested as chopped material using
precision-cut forage harvester
a
Harvester mass flow Density in
truck
Density in silo bag
Final
particle
size (mm)
Moisture
(%, w.b.)
Wet
(Mg h
−1
)
Dry
(Mg h
−1
)
Wet
(kg m
−3
)
Dry
(kg m
−3
)
Wet
(kg m
−3
)
Dry
(kg m
−3
)
Length of cut
2002
6.4mm
48.4
49.1
25.9
158
b
82
b
288
150
17.8
12.7 mm
47.9
53.7
28.0
134
c
69
c
301
157
25.4
19.1 mm
45.8
55.5
30.1
126
c
67
c
286
150
27.9
LSD
d
(
P
=0.05) 4.1
14.3
9.1
18
5
91
43
NA
2003
6.4mm
49.6
40.8
20.2
c
136
67
261
130
20.3
c
12.7 mm
48.0
51.3
26.0
b
131
69
251
128
22.9
b
19.1 mm
45.8
51.3
26.8
b
128
69
240
122
27.9
b
LSD
d
(
P
=0.05) 6.5
11.1
4.2
24
13
75
37
2.5
a
Adapted from [
32
]
b
In2003,particlesizeofstoverbeforeshreddingandchoppingwas610 mmandaftershreddingbut
beforechoppingwas172mm.Stoveryieldwas10.5MgDMha
−1
just preceding grain harvest. Average
harvested stover yield after shredding, windrowing, and chopping was 5.8 Mg DM ha
−1
c
In2002,particlesizeofstoverbeforeshreddingandchoppingwas690 mmandaftershreddingbut
beforechoppingwas290 mm.Stoveryieldwas9.2 MgDMha
−1
just preceding grain harvest. Average
harvestedyieldaftershredding,windrowing,andchoppingwas4.9MgDMha
−1
d
Averages with different subscripts in the same column are significantly different at 95 % confidence
Table 5.10
Productivity and physical properties of wet corn stover harvested as baled material
using large round or large square balers
a
Baler mass flow
Bale density
Harvested yield
b
Moisture
(% w.b.)
Wet
(Mg h
−1
)
Dry
(Mg h
−1
)
Wet
(kg m
−3
)
Dry
(kg m
−3
)
Wet
(Mg ha
−1
)
Dry
(Mg ha
−1
)
2002
LRB
c
—Twine
37.9
18.0
b
11.2
b
176
b
109
b
6.7
b
4.3
b
LSB
c
39.9
34.7
c
20.9
c
248
c
149
c
9.0
c
5.4
c
LSD
d
(
P
=0.05) 2.9
2.5
1.6
13
6
0.9
0.5
2003
LRB
c
—Net
36.8
21.9
c
13.6
c
186
117
9.0
5.7
LRB
c
—Twine
36.8
16.1
b
10.2
b
190
118
8.5
5.4
LSD
d
(
P
=0.05) 6.3
2.4
1.2
16
10
1.8
0.7
a
Adapted from [
32
]
b
Stover yield of standing plant material was 8.6 Mg DM ha
−1
justprecedinggrainharvestin2002
and 11.3 Mg DM ha
−1
in2003
c
LRB
large round bales,
LSB
large square bales
d
Averages with different subscripts in the same column are significantly different at 95 % confi-
dence. LSD (least significant difference)
throughputratefrom20to30Mgha
−1
asthetheoreticalcutlengthvariedfrom6.4
to 19.6 mm [
32
].
In the same study [
32
], the round bale density was found to be lower than the
square bale density for both wet and dry harvest (Tables
5.10
and
5.11
). The
throughput rate was higher for the square baler than the round baler. Low ambient
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