## 3 Results
### Effect of the Irrigation System and Variety on the Yield, Yield Components, and WUE of Winter Wheat
From 2020 to 2021, the yield and WUE of Hengmai4399 under the W3 treatment were remarkably higher than those under the other two irrigation treatments. The yield and WUE of the W3 treatment of Hengguan35 were notably higher compared to the W1 treatment while the difference between the W2 treatment and the other two irrigation treatments was not found to be significant. The yields of Hengmai4399 and Hengguan35 under the W2 and W3 treatments increased by 8.37-49.80% and 17.54-35.63%, respectively, compared with those under the W1 treatment. The WUE under the W3 treatment increased by 46.39-47.27% and 22.91-32.53%, respectively, compared with the W1 and W2 treatments (Table 5). From 2021 to 2022, except for Hengguan35, the yield of other varieties in the W1 treatment was significantly decreased compared to the W2 and W3 treatments. There was no notable difference in the yield among varieties under the same irrigation amount. The yields of Hengmai4399, Hengguan35, and Hengmai28 in the W2 and W3 treatments increased by 13.23-18.93%, 5.94-6.46%, and 13.99-17.51%, respectively, compared with those in the W1 treatment. Different from the previous year, the WUE of Hengmai4399, Hengguan35, and Hengmai28 showed W2 \(>\) W3 \(>\) W1. The WUE of the W2 treatment was 5.00-18.64%, 9.33-10.47%, and 6.44-18.78% higher than that of the W3 and W1 treatments, respectively (Table 5). From 2020 to 2021, winter wheat varieties had no significant influence on the thousand-grain weight, yield, or WUE. The effect of irrigation treatment on the yield and WUE reached an extremely significant level, but had no remarkable effect on the thousand-grain weight. The interaction between irrigation and variety had no significant impact on the thousand-kernel weight, yield, and WUE. From 2021 to 2022, the thousand-grain weight, effective spikes, and grains per spike was significantly influenced by variety. Different from the previous year, the effect of irrigation treatment on the yield, thousand-grain weight,  
\begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline \multirow{2}{*}{**Year**} & \multirow{2}{*}{**Treatments**} & \multirow{2}{*}{**Variety**} & \multicolumn{2}{c}{**Thousand-**} & \multirow{2}{*}{**Effective Spikes (10\({}^{6}\)-hm-2)**} & \multirow{2}{*}{**Grains per Spike**} & \multicolumn{2}{c}{**Grain Yield**} & \multicolumn{2}{c}{**Water Use**} \\  & & & & & & Spike & & **Qg-hm-2)** & **Effective Flory** (kg-m-2)** & **Rate (\%)** \\ \hline \multirow{8}{*}{2020-2021} & \multirow{2}{*}{W1} & Hemgmai4399 & \(39.98\pm 3.21\) A & - & - & 6178.09 \(\pm\) 674.41 A & 1.66 \(\pm\) 0.18 B & - \\  & & Hengguan35 & \(41.05\pm 1.94\) A & - & - & 6178.09 \(\pm\) 1097.13 B & 1.66 \(\pm\) 0.30 B & - \\ \cline{2-8}  & & Hemgmai4399 & \(41.21\pm 1.59\) A & - & - & 6695.01 \(\pm\) 326.44 A & 1.65 \(\pm\) 0.8 B & 8.37 \\  & & [PERSON] & \(43.65\pm 3.50\) A & - & - & 7261.96 \(\pm\) 1512.28 A & 1.79 \(\pm\) 0.26 A & 17.54 \\ \cline{2-8}  & & \multirow{2}{*}{W3} & [PERSON] & \(42.20\pm 2.87\) A & - & - & 9254.63 \(\pm\) 319.34 B & 2.43 \(\pm\) 0.08 A & 49.80 \\  & & [PERSON] & \(44.46\pm 2.07\) A & - & - & 8579.19 \(\pm\) 452.30 A & 2.20 \(\pm\) 0.12 A & 35.63 \\ \hline \multirow{8}{*}{2021-2022} & \multirow{2}{*}{W1} & [PERSON] & \(42.75\pm 2.10\) A & 559.72 \(\pm\) 65.72 A & 36.83 \(\pm\) 2.10 A & 789.44 \(\pm\) 200.23 A & 1.77 \(\pm\) 0.04 A & - \\  & & Hemgmai4399 & \(43.29\pm 2.97\) A & 535.98 \(\pm\) 65.73 A & 35.71 \(\pm\) 1.34 A & 8511.11 \(\pm\) 81 A & 1.91 \(\pm\) 0.13 A & - \\  & & Hemgmai284 & \(44.95\pm 3.64\) A & 629.69 \(\pm\) 19.83 A & 33.09 \(\pm\) 2.04 A & 806.11 \(\pm\) 192.45 A &and WUE reached a highly remarkable level. The synergistic effect among irrigation and variety had an obvious influence on the grains per spike but had no significant effect on other traits (Table 6).