加厚地膜及其免耕两年使用对玉米产量、WUE及地膜回收率的影响

Effects of thickened plastic film and its two-year reuse with no tillage on maize yield, WUE, and plastic film recycling rate

  • 摘要: 如何提高玉米产量和降低残膜污染是黄土高原半干旱区玉米生产的急需解决的重要问题。本研究于2023—2024年开展了田间试验, 研究了地膜厚度及其免耕两年使用对陇中旱地玉米产量、水分利用效率(WUE)及地膜回收率的影响。本研究设置地膜利用方式(T1: 新膜; T2: 免耕地膜两年使用)和地膜厚度(H1: 0.01 mm; H2: 0.015 mm; H3: 0.02 mm)二因素试验, 共6个处理(T1H1、T1H2、T1H3、T2H1、T2H2、T2H3)。研究结果表明: 相比免耕地膜两年使用, 新膜在H1、H2和H3厚度下分别显著增加苗期-拔节期0~25 cm土层的平均土壤温度6.71%、5.60%、5.77%; 而在拔节期-成熟期, 新膜和免耕地膜两年使用的土壤平均温度差异不显著。在新膜和免耕地膜两年使用下, H2和H3处理的成熟期生物量和产量差异均不显著; 而在H1厚度下, 免耕地膜两年使用的成熟期生物量和产量较新膜分别降低了27.18%和24.10%。加厚地膜(H2和H3)较普通地膜(H1)显著提高WUE 27.07%和30.08%。在新膜处理下, 3种厚度地膜的玉米净收益和产投比差异不显著; 而在免耕地膜两年使用下, H2和H3较H1分别显著增加玉米净收益45.74%和46.10%, 分别提高产投比11.10%和9.63%。免耕地膜两年使用处理较新膜处理显著降低了地膜回收率, 但加厚地膜较传统地膜在免耕地膜两年使用下能显著提高地膜回收率。这些结果说明新膜使用下加厚地膜的增产增收效应不明显; 而免耕地膜两年使用下加厚地膜的增产增收效应显著。因此, 综合考虑产量、水分利用效率、地膜回收率和经济效益, 0.015 mm地膜结合其免耕两年使用是黄土高原旱农区适宜的地膜措施。

     

    Abstract: How to increase maize yield and reduce residual film pollution remains an important issue urgently needing to be addressed in maize production in the semi-arid region of the Loess Plateau. A field experiment was conducted to investigate the effects of different plastic film thicknesses and their two-year reuse under no-till on maize yield, water use efficiency (WUE), and film recovery rate in central Gansu Province from 2023 to 2024. The experimental design included two factors: plastic film utilization methods (T1: new film; T2: two-year reuse of plastic film with no-till) and plastic film thickness (H1: 0.01 mm; H2: 0.015 mm; H3: 0.02 mm), with a total of 6 treatments (T1H1、T1H2、T1H3、T2H1、T2H2、T2H3). The results showed that compared with the two-year reuse of plastic film with no-till, new plastic film under H1, H2, and H3 significantly increased the average soil temperature in the 0-25 cm layer during the seedling to jointing stage by 6.71%、5.60%, and 5.77%, respectively. From jointing to maturity stages, no significant differences in average soil temperature in the 0-25 cm layer were observed between new film and two-year reuse of plastic film with no-till. However, under H2 and H3 thicknesses, two-year reuse of plastic film with no-till did not significantly reduce soil water storage during these periods. Both new film and two-year reuse of plastic film with no-till treatments showed no significant differences in harvest biomass or yield between H2 and H3. Compared with the new film treatment, the two-year use of no-tillage film reduced the biomass and yield at maturity by 27.18% and 24.1%, respectively under H1 thickness, respectively. Thicker films (H2 and H3) significantly increased WUE by 27.07% and 30.08% compared to H1. Under new film, the net income or ratio of output to input were not significant differences among H1, H2, and H3. Under two-year reuse of plastic film with no-till, compared to H1, H2 and H3 increased net income by 45.74% and 46.10%, respectively, and elevated the ratio of output to input by 11.10% and 9.63%, respectively. Although two-year reuse of plastic film with no-till significantly reduced the film recovery rate compared to new film, thicker films under two-year reuse with no-till significantly improved the recovery rate compared to H1. These results indicate that under new film, thicker films did not significantly increase yield or net income; however, thicker films under two-year reuse with no-till significantly enhanced both yield and net income. Therefore, considering yield, WUE, film recovery, and economic benefits, the 0.015mm plastic film combined with two-year reuse of plastic film under no-till is a suitable plastic film measure for arid agricultural areas on the Loess Plateau.

     

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