TABLE 5.
Yield, yield components, aboveground biomass, and harvest index for each drip irrigation treatment during 2016–2017 and 2017–2018 growing seasons.
| Treatment | Spike number (104 ha–1) | Grains spike–1 | 1000-grain weight (g) | Yield (kg ha–1) | Aboveground biomass (kg ha–1) | Harvest index |
| 2016–2017 | ||||||
| 0.25 ETc | 650 c | 33.5 b | 35.8 c | 7991 d | 15795 d | 0.440 bc |
| 0.4 ETc | 710 b | 35.6 ab | 37.6 b | 8727 c | 17529 c | 0.433 cd |
| 0.6 ETc | 758 a | 36.9 a | 38.9 ab | 10325 ab | 19412 b | 0.463 a |
| 0.8 ETc | 759 a | 37.2 a | 39.6 a | 10610 a | 20306 a | 0.455 ab |
| 1.0 ETc | 754 a | 37.3 a | 37.7 b | 10088 b | 20985 a | 0.415 d |
| 2017–2018 | ||||||
| 0.25 ETc | 473 c | 27.8 c | 45.6 d | 6481 d | 11958 e | 0.471 a |
| 0.4 ETc | 533 b | 31.1 b | 46.9 c | 7648 c | 13585 d | 0.480 a |
| 0.6 ETc | 562 b | 34.4 a | 47.2 bc | 8536 b | 15187 c | 0.489 a |
| 0.8 ETc | 629 a | 35.7 a | 48.4 a | 9171 a | 16398 a | 0.486 a |
| 1.0 ETc | 608 a | 35.0 a | 47.6 abc | 8930 ab | 16014 ab | 0.485 a |
Values within a column followed by different lowercase letters are significantly different among different treatments at P < 0.05. The 0.25, 0.4, 0.6, 0.8, and 1.0 ETc represents 25, 40, 60, 80, and 100% crop evapotranspiration, respectively.