Table 1. Mean squares from the analysis of variance of turfgrass quality (TQ), normalized difference vegetation index (NDVI),photochemical efficiency (Fv/Fm), shoot electrolyte leakage (ShEL), and root viability (RV) in creeping bentgrass treated with different levels of nitrogen under heat stress.
Day | Source | df | TQ | NDVI | Fv/Fm | ShEL | RV |
1 | Block | 3 | 0.0040 | 0.0004 | 0.0012* | ||
Nitrogen | 3 | 0.9740** | 0.0069* | 0.0002 | |||
Error | 9 | 0.0323 | 0.0012 | 0.0002 | |||
R2 | 0.9099 | 0.6679 | 0.6952 | ||||
15 | Block | 3 | 0.0990 | 0.0003 | 0.0057 | ||
Nitrogen | 3 | 0.1823 | 0.0006 | 0.0019 | |||
Error | 9 | 0.0867 | 0.0007 | 0.0096 | |||
R2 | 0.5194 | 0.6301 | 0.7256 | ||||
36 | Block | 3 | 0.0523 | 0.0032 | 0.0180 | ||
Nitrogen | 3 | 0.0612 | 0.0059 | 0.0069 | |||
Error | 9 | 0.0162 | 0.0043 | 0.0091 | |||
R2 | 0.7223 | 0.4157 | 0.4787 | ||||
50 | Block | 3 | 0.4769 | 0.0022 | 0.0067 | 33.1975 | 0.0058 |
Nitrogen | 3 | 2.2256** | 0.0596** | 0.0511** | 841.0742** | 0.0275** | |
Error | 9 | 0.2241 | 0.0022 | 0.0029 | 59.1975 | 0.0025 | |
R2 | 0.8502 | 0.9342 | 0.9067 | 0.8794 | 0.8626 |
**, * mean significant level at p<0.01 and 0.05, respectively.