PJB-2020-312
EFFECTS OF IRRIGATION TERMINATION DATES ON GRAIN YIELD HARVEST MOISTURE AND SOME AGRONOMIC TRAITS ON MAIZE
Erdal Gonulal
Abstract
This study was conducted to investigate the effects of different irrigation termination dates on maize grain yield, harvest moisture and some other agronomic traits. The relationships between irrigation termination dates and investigated traits were visually assessed through biplot analysis. Experiments were conducted for two years (2016 and 2017) in randomized blocks design with three replications. Irrigations were terminated at eight different dates (S1: 20 days after the emergence of the initial top tassels; S2: 5 days after S1; S3: 10 days after S1; S4: 15 days after S1; S5: 20 days after S1; S6: 25 days after S1; S7: 30 days after S1; S8: 35 days after S1). Despite low kernel harvest moisture levels, early irrigation termination dates had low yield levels (S1:10460 kg ha-1 grain yield 11.7% harvest moisture). However, despite high yield levels, late irrigation termination dates had high kernel harvest moisture levels (S7: 16100 kg ha-1 grain yield and 18.8% harvest moisture; S8: 16240 kg ha-1 grain yield and 19.6% harvest moisture). In terms of grain yield and harvest moisture, S4 (14050 kg ha-1 grain yield and 14.2% harvest moisture), S5 (14170 kg ha-1 grain yield and 15.0% harvest moisture) and S6 (14880 kg ha-1 grain yield and 16.1% harvest moisture) treatments had similar values and were considered to be as the most appropriate irrigation termination dates. In biplot graph, grain yield, harvest moisture, days to physiological maturity and number of kernels per ear were placed into the same sector with diagonal S7 and S8 treatments, thus had significant relationships with each other, these traits had the greatest values in S7 and S8 treatment. Together with yields, some other agronomic traits were also investigated in this study. Kernel weigh per ear varied between 150.6 g (S1) and 238.7 g (S7); number of kernels per ear varied between 677 kernels (S1) and 741 kernels (S5), ear lengths varied between 16.7 cm (S1) - 24.1 cm (S4), thousand-kernel weights varied between 271 g (S1) and 381 g (S8), hectoliter weights varied between 74.3 kg (S1) and 78.1 kg (S4) and number of days to physiological maturity varied between 112.5 days (S1) and 124.5 days (S8).
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