Sugarcane Yield Response to Furrow-Applied Organic Amendments on Sand Soils
Table 7
Predicted least squares means, , and significant contrasts for leaf nutrient concentrations for the first ratoon crop at Site 1. Critical leaf nutrient concentrations [19] are included for comparison.
Treatmenta
N
P
K
Ca
Mg
Si
Fe
Mn
Zn
Cu
g kg−1
mg kg−1
(1) Control
19.2
2.12
9.2
3.6
2.0
5.9
46
20
16
4.2
(2) MM (226 m3 ha−1)
21.3
2.45
10.1
3.8
2.2
6.6
51
24
17
4.3
(3) CP (226 m3 ha−1)
20.4
2.09
9.9
4.1
2.1
5.5
51
18
18
4.9
(4) MM (14 m3 ha−1)
18.8
2.12
9.3
3.6
2.1
5.3
48
19
16
4.4
(5) MM (28 m3 ha−1)
19.4
2.18
8.9
3.8
2.1
5.8
48
20
16
4.2
(6) MM (56 m3 ha−1)
20.5
2.30
9.7
4.1
2.3
5.6
51
20
17
4.7
(7) CP (14 m3 ha−1)
19.4
2.07
9.0
3.8
2.1
5.7
46
18
16
5.6
(8) CP (28 m3 ha−1)
19.0
2.06
8.9
3.9
2.1
5.5
49
19
16
4.2
(9) CP (56 m3 ha−1)
19.6
2.12
9.3
3.7
2.1
4.4
48
17
17
4.9
0.004
<0.001
0.023
0.027
0.631
0.108
0.036
0.004
0.518
0.804
Contrastsb
T1 versus T2
**
***
*
NS
NS
NS
**
*
NS
NS
T1 versus T3
†
NS
†
**
NS
NS
*
NS
†
NS
T1 versus T4, T5, and T6
NS
NS
NS
NS
NS
NS
†
NS
NS
NS
T5 versus T6
†
NS
NS
†
NS
NS
†
NS
NS
NS
T7 versus T8
NS
NS
NS
NS
NS
NS
†
NS
NS
NS
T8 versus T9
NS
NS
NS
NS
NS
†
NS
NS
NS
NS
Critical leaf values
18.0
1.90
9.0
2.0
1.3
5.0
50
16
15
3.0
Significant differences between specified treatments at , 0.05, 0.01, or 0.001, respectively. NS: no significant difference at for the specified contrast.
aMM: mill mud; CP: yard waste compost. Treatments 2 and 3 were broadcast prior to planting and treatments 4–9 were applied in the furrow prior to planting.
bOther contrasts tested in analysis of variance were treatments 1 versus 7, 8, and 9 and 4 versus 5. Only contrasts with significant differences were listed in the table.
