| Effects of drip irrigation under mulch on seed development and seedling growth of maize in Hexi oasis |
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| DOI：10.7606/j.issn.1000-7601.2022.04.17 |
| Key Words: water deficit regulation seeds\|production maize seed development production seedling growth water use efficiency antioxidant enzyme activity |
| Author Name | Affiliation | | LIANG Chao | College of Water Resources and Hydropower Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | ZHANG Hengjia | College of Water Resources and Hydropower Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | XIAO Rang | School of Civil Engineering, Hexi University/Hexi Corridor Water Resources Protection and Utilization Research Institute, Hexi University, Zhangye, Gansu 734000, China | | DENG Haoliang | School of Civil Engineering, Hexi University/Hexi Corridor Water Resources Protection and Utilization Research Institute, Hexi University, Zhangye, Gansu 734000, China | | WANG Zeyi | College of Water Resources and Hydropower Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | LI Zhen | Lanzhou New District Agricultural Technology Development Co., Ltd. Lanzhou, Gansu 730314, China | | CHEN Tao | College of Water Resources and Hydropower Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | ZHOU Sanli | College of Water Resources and Hydropower Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| To explore the effect of drip irrigation under mulch on the growth of seedling maize grains and seedling growth in Hexi Oasis Irrigation District, we set up 9 treatments including 8 water regulated deficit irrigation treatments based on two\|factor random combination of different growth periods and water regulated deficit gradients and a full irrigation treatment (CK) as a control. The yield, water use efficiency, seed germination, physiological activity and nutrients of each treatment were measured. The results showed that: compared with CK, except for T1 and T3, the regulated deficit irrigation at different growth periods reduced the yield of seed\|producing maize by 3.07%~26.84%. Among the regulated deficit treatments, T1 treatment had the highest water use efficiency (1.61 kg·m-3), followed by T3 (1.59 kg·m-3), which were increased respectively by 6.62% and 1.32% compared with CK. The germination index and vigor index of grains of T8 treatment were decreased by 30.39%, 30.07% compared with CK, and the vigor index of the other moderately water\|deficient maize grains was not significantly different from that of CK. The content of malondialdehyde was not significantly different except T1 and CK, which were at a lower level. For other treatments, the content of MDA all increased, which was 13.04%~134.78% higher than that of CK. The soluble protein content of T3 (40.64 mg·g-1) and T5 (40.35 mg·g-1) treatments was not significantly different than that of CK, and the remaining water deficit treatments were significantly reduced, with a decrease of 6.90%~16.60%. The antioxidant enzyme activity and nutrient content of T1 treatment were relatively optimal, and SOD, CAT, soluble sugar, vitamin C, and root vitality increased individually by 3.77%, 0.10% and 19.67%, 3.89%, 8.56% compared with CK. The results of irrigation system evaluation using principal component analysis and membership function demonstrated that the optimal water deficit adjustment treatment for seed production was mild. Keeping the relative soil moisture content at 70%~75% in the seedling stage and 85%~90% in the rest of the growth period is recommended as the best irrigation mode for seed production in the Hexi Oasis Irrigation District. |
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