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| DOI：10.13522/j.cnki.ggps.20180297 |
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| The Effect of Straw Mulching and Pre-sowing Irrigation on Resistance of Summer Maize Against Lodging |
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ZHANG Haonan, YU Qun, DU Xinyu, LIU Mengqi, XU Junju, LIU Zhongqiu
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College of Water Conservancy and Civil Engineering, Shandong Agricultural University, Tai’an 271018, China
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| Abstract: |
| 【Objective】 Lodging damages crop and leads to yield loss. The purpose of this paper is to investigate experimentally the feasibility of straw mulching and pre-sowing irrigation in improving the resistance of summer maize at mature stage against lodging. 【Method】 The experiment consisted of two mulching treatments: mulching with wheat straw at 0.6 kg/m2 and no mulching, and three pre-sowing irrigation amounts: low irrigation at 30 mm, intermediate irrigation at 70 mm and sufficient irrigation at 110 mm. Overall, there were 6 treatments. During each treatment, the physical parameters of the maize stalk, the physical strength of the last third internode, the lodging resistance index at mature stage, and ultimate yield were measured.【Result】Compared with no mulching, mulching increased height of the spike position and the gravitational center, as well as the bending strength of the last third internode; it also improved the lodging resistance and the grain yield by 7.6%. Irrigation had a significant impact on height of the spike position, plant height, the ratio of height to diameter and mechanical strength of the last third internode at the mature stage. The grain yield increased with the irrigation amount. Mulching coupled with 70 mm of irrigation was most effective against lodging, and irrigating 70 mm without mulching was most vulnerable to lodging. The lodging resistance index correlated with the ratio of stalk length to its diameter as well as the bending strength of the last third internode, with their correlation coefficient being -0.458 7 and 0.434 6 respectively in 2016, and -0.315 7 and 0.375 respectively in 2017. The lodging resistance was independent of height of the spike position. 【Conclusion】 Mulching with wheat straw coupled with 70 mm of irrigation prior to sowing can improve lodging resistance of summer maize. |
| Key words: summer maize; lodging resistance; straw mulching; pre-sow irrigation; yield |
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