Table 2: Analysis of variance for seed cotton yield, dry matter, RVR, and water productivity as affected by years, N-fertilizer rates, and irrigation modes (F-test values).
| Source of Variance |
df |
SCY |
DM |
RVR |
WPy |
WPd |
| 2014 |
|
|
|
|
|
|
| N-fertilizer rates (N) |
4 |
7.53**
|
4.69**
|
1.57 ns
|
7.44**
|
4.52**
|
| Irrigation methods (I) |
2 |
81.15**
|
46.08**
|
1.91 ns
|
5.67**
|
17.52**
|
| N × I |
8 |
1.46 ns
|
3.19*
|
1.55 ns
|
1.52 ns
|
2.97*
|
| Error |
28 |
|
|
|
|
|
| CV (%) |
|
8.0 |
21.8 |
27.7 |
8.2 |
22.2 |
| 2015 |
|
|
|
|
|
|
| N-fertilizer rates (N) |
4 |
0.96 ns
|
3.16*
|
7.86**
|
0.83 ns
|
2.81*
|
| Irrigation methods (I) |
2 |
59.51**
|
25.1**
|
8.36**
|
22.8**
|
5.91**
|
| N × I |
8 |
2.93*
|
3.06*
|
5.03**
|
2.74*
|
2.66*
|
| Error |
28 |
|
|
|
|
|
| CV (%) |
|
18.0 |
23.3 |
15.2 |
18.2 |
24.9 |
| Combined analysis 2014-2015 |
|
|
|
|
|
|
| N-fertilizer rates (N) |
4 |
36.04**
|
47.6**
|
27.03**
|
9.17*
|
20.78**
|
| Irrigation methods (I) |
2 |
7.93 ns
|
85.5*
|
0.55 ns
|
2.21 ns
|
13.22 ns
|
| Interactions |
|
|
|
|
|
|
| N × I |
8 |
0.64 ns
|
1.94 ns
|
0.49 ns
|
0.54 ns
|
2.00 ns
|
| Year × N |
4 |
0.11 ns
|
0.16 ns
|
0.23 ns
|
0.43 ns
|
0.33 ns
|
| Year × I |
2 |
14.12**
|
0.80 ns
|
4.62 *
|
11.98 **
|
1.62 ns
|
| Year × N × I |
8 |
3.27 ns
|
2.12 ns
|
3.28 ns
|
3.23 ns
|
1.87 ns
|
| Pooled error |
56 |
|
|
|
|
|
| CV (%) |
|
14.0 |
22.6 |
21.9 |
13.6 |
23.5 |
* = significant at 5% level, ** = significant at 1% level, ns = non-significant at 5% level, df = degree of freedom, SCY = seed cotton yield, DM = dry matter, RVR = reproductive to vegetative ratio, WPy = water productivity for SCY, WPd = water productivity for dry matter.