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| DOI：10.13522/j.cnki.ggps.2020423 |
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| The Effect of Straw Mulching Coupled with Furrow Irrigation on Root Distribution and Yield of Summer Maize |
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ZHANG Yin, E Jifang, SUN Minghai
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1. Hetao University, Bayannur 015000, China; 2. Hulunbuir Real Estate Management Office, Hulunbuir 021000, China
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| Abstract: |
| 【Objective】 Root growth and its consequence for yield is modulated by water and nutrient distribution in soil, as well as soil resistance for roots to grow. The objective of this paper is to explore how straw mulching and furrow irrigation combine to affect root growth, as well as the ultimate yield and water use efficiency of summer maize.【Method】The experiments were conducted at a field in Hetao irrigation district, Inner Mongolia (China), with the site ridge tilled. It consisted of four treatments: furrow irrigation coupled with film mulching (FM), furrow irrigation with the ridge-top mulched by straws (FLJ), furrow irrigation with the depression mulched by straws, and furrow irrigation with both ridge top and depression mulched by straws (FLGJ). For each treatment, we measured root length, water consumption, yield and traits of the summer maize.【Result】Straw mulching had a significant impact on root distribution, yield and water use efficiency. Mulching the depression with straws improved root distribution, water use efficiency and the yield as it increased root growth into soil deeper than 40 cm in the ridge top by 128.1% compared with FM, and root density in soil deeper than 20 cm in the depression. Compared with FM, FGJ and FLGJ increased water use efficiency by 51.9% and 54.3% respectively, and yield by 9.3% and 9.0% respectively, despite that the harvest index of FGJ was 0.48, significantly higher than that of other treatments.【Conclusion】Integrating furrow irrigation with straw mulching of the depression in ridge tillage was most efficient for promoting deep roots growth, thereby increasing water use efficiency and yield of summer maize. It can be used as a cultivation method to improve water use efficiency of summer maize in the Hetao irrigation district and its adjacent regions. |
| Key words: furrow irrigation; straw mulching; root system; yield; summer maize |
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