Table 3.
Effects of water heterogeneity (W), nutrient level (N), plant density (D) and block on ACI
| (A) Three-way ANOVA | ||||
|---|---|---|---|---|
| Source | d.f. | SS | F-value | P |
| W | 1 | 46·48 | 31·98 | <0·001 |
| N | 1 | 0·00 | 0·00 | 0·978 |
| D | 2 | 80·34 | 27·64 | <0·001 |
| W × N | 1 | 2·92 | 2·01 | 0·158 |
| W × D | 2 | 0·26 | 0·09 | 0·915 |
| N × D | 2 | 0·56 | 0·19 | 0·824 |
| W × N × D | 2 | 1·96 | 0·67 | 0·511 |
| Block | 17 | 199·12 | 8·06 | <0·001 |
| Error | 175 | 254·36 | ||
| (B) Two-way ANOVA at each density | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 3-plant density | 6-plant density | 9-plant density | |||||||
| Source | d.f. | F-value | P | d.f. | F-value | P | d.f. | F-value | P |
| W | 1 | 10·48 | 0·002 | 1 | 7·63 | 0·008 | 1 | 7·97 | 0·007 |
| N | 1 | 0·15 | 0·698 | 1 | 0·00 | 0·969 | 1 | 0·18 | 0·673 |
| W × N | 1 | 2·31 | 0·135 | 1 | 0·25 | 0·616 | 1 | 0·00 | 0·979 |
| Block | 17 | 2·08 | 0·024 | 17 | 2·42 | 0·008 | 17 | 2·26 | 0·016 |
| Error | 49 | 49 | 43 | ||||||