| Effects of combined application of common urea and controlled\|release urea on foxtail millet yield and nitrogen utilization |
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| DOI：10.7606/j.issn.1000-7601.2024.05.07 |
| Key Words: foxtail millet urea combined application dry matter accumulation yield nitrogen use efficiency |
| Author Name | Affiliation | | SHEN Zhaoyang | College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China
Zigong Rural Revitulization and Development Service Center, Zigong, Sichuan 643000, China | | GAO Linguang | Jiaxian Agricultural Technology Extension Center, Jiaxian, Shaanxi 719200, China | | ZHOU Haolu | College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China | | LUO Xinyu | College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China | | Huang Yinghui | College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China | | GAO Xiaoli | College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| To uncover the physiological and ecological mechanisms by which controlled\|release urea in regulating grain growth, and nitrogen uptake and utilization in dryland conditions, a field experiment was conducted with a foxtail millet variety of ‘Shanyugu 3’ in the semi\|arid, rain\|fed agricultural region of northern Shaanxi Province from 2022 to 2023. The study included 6 treatments: no urea (CK), 100% common urea (F1), 100% controlled\|release urea (F2), 50% common urea +50% controlled\|release urea (F3), 70% common urea +30% controlled\|release urea (F4), 30% common urea +70% controlled\|release urea (F5). The total nitrogen of fertilizer treatment was 135 kg·hm-2. The effects of common urea and controlled\|release urea combined application on the growth and development of foxtail millet, dry matter accumulation, yield, nitrogen uptake and utilization were studied. The results showed that when the proportion of controlled\|release urea was 30%~50%, the performance of foxtail millet indexes was better than other treatments. Compared with the conventional fertilizer F1 treatment, when the ratio of controlled\|release urea was 30%~50%, the SPAD value of leaves at grain filling stage was increased by 0.65%~3.20%, the net photosynthetic rate Pn was increased by 1.07%~4.33%, the total dry matter accumulation at maturity was increased by 14.53%~77.27%, and the yield was increased by 29.28%~31.81%. Nitrogen utilization rate, nitrogen partial productivity and nitrogen agronomic utilization rate were increased by 9.67% to 55.47%, 9.72% to 66.74% and 43.04% to 295.55%, respectively. In conclusion, when the total nitrogen fertilizer application is 135 kg·hm2, common urea combined with 30%~50% controlled\|release urea is advantageous for the growth and development of foxtail millet in dry farming conditions in northern Shaanxi Province. |
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