Improvement in Photosynthetic Rate and Grain Yield in Super-High-Yield Maize (Zea mays L.) by Optimizing Irrigation Interval under Mulch Drip Irrigation

文献类型： 外文期刊

第一作者： Shen, Dongping

作者： Shen, Dongping;Zhang, Guoqiang;Xie, Ruizhi;Ming, Bo;Hou, Peng;Xue, Jun;Li, Shaokun;Wang, Keru

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关键词： irrigation interval; soil moisture; leaf photosynthetic rate; dry matter accumulation; grain yield

期刊名称：AGRONOMY-BASEL （ 影响因子：3.417； 五年影响因子：3.64 ）

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年卷期： 2020 年 10 卷 11 期

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收录情况： SCI

摘要： High yield is one of the important goals of crop production, and close planting and optimum irrigation systems are important agronomic practices for increasing maize (Zea mays L.) grain yield. However, little is known about the effect of optimal irrigation interval on the photosynthetic rate (P-n) and dry matter accumulation (DM) of closely planted super-high-yield maize under drip irrigation under mulch. Therefore, the objective of this study was to determine the effects of irrigation interval on the leaf P-n, DM, and grain yield of closely planted super-high-yield maize under mulch drip irrigation in the Xinjiang Uygur Autonomous Region, Northwestern China. A field experiment was conducted using three irrigation intervals in 2016-namely, six days (D6), nine days (D9), and 12 days (D12)-and five irrigation intervals in 2017-namely, three days (D3), six days (D6), nine days (D9), 12 days (D12), and 15 days (D15). The Xianyu 335 high-yield maize hybrid was used in the test; the planting density was set to 12x10(4) plants ha(-1), and an optimal irrigation quota of 540 mm was used. The results showed that during the irrigation period, (1) the soil moisture content (SMC), DM, leaf P-n, and grain yield of treatment D6 were higher than for other irrigation intervals, (2) the leaf P-n and stomatal conductance (G(S)) of the leaves of treatments D3, D9, D12, and D15 were significantly correlated with the SMC of the 0-40 cm soil layer, and (3) the leaf P-n of treatment D6 was significantly positively correlated with SMC in the 0-60 cm soil layer but not significantly correlated with G(S). Irrigation treatment D6 was found to maintain high SMC, provide a water environment favorable to the growth of maize, and increase the leaf P-n and DM, and thereby obtain maize grain yield (20.6-21.0 t ha(-1)). Therefore, an optimal irrigation interval could be beneficial for adjusting soil moisture, leaf P-n, and DM in order to increase maize grain yield with drip irrigation under mulch.

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