Sugarcane Yield Response to Furrow-Applied Organic Amendments on Sand Soils
Table 8
Predicted least squares means, , and significant contrasts for leaf nutrient concentrations for the first ratoon crop at Site 2. 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
23.5
2.75
10.7
6.4
2.3
6.2
60
50
20
5.6
(2) MM (28 m3 ha−1)
24.7
2.92
10.8
6.7
2.5
6.5
63
51
20
5.5
(3) MM (56 m3 ha−1)
24.2
2.98
11.0
6.8
2.6
6.7
63
52
21
7.2
(4) CP (28 m3 ha−1)
24.2
2.77
11.4
6.1
2.3
5.9
60
48
20
5.8
(5) CP (56 m3 ha−1)
24.2
2.76
10.5
6.4
2.4
5.8
59
46
19
5.5
0.154
0.015
0.288
0.147
0.055
0.122
0.113
0.444
0.168
0.561
Contrasts
T1 versus T2 and T3
*
**
NS
NS
*
NS
†
NS
NS
NS
T2 versus T3
NS
NS
NS
NS
NS
NS
NS
NS
†
NS
T1 versus T4 and T5
†
NS
NS
NS
NS
NS
NS
NS
NS
NS
T4 versus T5
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, or 0.01, respectively. NS: no significant difference at for the specified contrast.
aMM: mill mud; CP: yard waste compost. All mill mud and compost treatments were applied in the furrow prior to planting.
