| Effects of carbon and nitrogen combined application on root morphological construction and yield formation of foxtail millet in Loess Plateau region |
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| DOI：10.7606/j.issn.1000-7601.2025.04.13 |
| Key Words: foxtail millet carbon and nitrogen combined application root morphology biomass yield water use efficiency |
| Author Name | Affiliation | | ZHOU Tianyou | College of Advanced Agricultural Sciences, Yulin University, Yulin, Shaanxi 719000, China | | LIU Qinhui | College of Advanced Agricultural Sciences, Yulin University, Yulin, Shaanxi 719000, China | | HU Dandan | College of Advanced Agricultural Sciences, Yulin University, Yulin, Shaanxi 719000, China | | WANG Zhihao | College of Advanced Agricultural Sciences, Yulin University, Yulin, Shaanxi 719000, China | | CUI Zhiwen | College of Advanced Agricultural Sciences, Yulin University, Yulin, Shaanxi 719000, China | | YANG Shuangshuang | College of Advanced Agricultural Sciences, Yulin University, Yulin, Shaanxi 719000, China | | WANG Xiaolin | College of Advanced Agricultural Sciences, Yulin University, Yulin, Shaanxi 719000, China
Engineering and Technology Research Center of Water Saving for Crops in Arid Area of Northern Shaanxi, Yulin, Shaanxi 719000, China | | Zhang Xiong | College of Advanced Agricultural Sciences, Yulin University, Yulin, Shaanxi 719000, China
Engineering and Technology Research Center of Water Saving for Crops in Arid Area of Northern Shaanxi, Yulin, Shaanxi 719000, China |
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| Abstract: |
| Using ‘Jingu 21’ as the experimental material, four biochar application gradients (C1 0.10 t·hm-2, C2 0.15 t·hm-2, C3 0.20 t·hm-2, and C4 0.25 t·hm-2) and three nitrogen fertilizer application gradients (N1 0.06 t·hm-2, N2 0.09 t·hm-2, and N3 0.12 t·hm-2) were set up, resulting in a total of 12 carbon\|nitrogen interaction treatments (C1N1, C1N2, C1N3, C2N1, C2N2, C2N3, C3N1, C3N2, C3N3, C4N1, C4N2, and C4N3). A randomized block design was adopted to analyze the effects of combined soil carbon and nitrogen application on the growth and development of millet roots, biomass accumulation and distribution, and yield formation, aiming to explore the biological potential of increasing yield and efficiency through the gradient application of carbon and nitrogen. The results showed that： (1) With the increase in nitrogen application ratio, compared to C1N1, the soil nitrate and ammonium nitrogen contents in C3N1, C3N2, and C3N3 treatments significantly decreased by 43.47%~81.98% and 21.10%~75.72%, respectively. (2) Under the C3 gradient, the root morphological indicators of nitrogen fertilizer application showed an increasing trend with the increase in nitrogen application rate. Compared to C1N1, the root length (RL), root surface area (RSA), and root length density (RLD) of millet at the jointing stage in C3N1, C3N2, and C3N3 treatments significantly increased by 7.16%~123.75%, 10.47%~226.59%, and 15.36%~60.36%, respectively. At the heading stage, RLD and root surface area density (RSD) increased by 15.36%~44.04% and 14.80%~17.47%, respectively. (3) The combination of biochar and nitrogen fertilizer could effectively increase the total aboveground biomass accumulation of millet. Compared with C1N1, the total aboveground biomass of C2N3 and C3N3 treatments increased by 9.51% to 56.25%. The yield and water use efficiency (WUE) significantly increased by 52.39%, 53.74%, and 31.82%, 64.72%, respectively. In summary, in the production of millet in the Loess Plateau region, the C3N3 (biochar 0.20 t·hm-2+nitrogen fertilizer 0.12 t·hm-2) model has a significant regulatory effect on the growth and development of the root cap of millet and can be used as a reasonable model for the combination of biochar and nitrogen fertilizer in the Loess Plateau region. |
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