| Effects of limited supplementary irrigation and nitrogen topdressing on dry matter and nitrogen accumulation and translocation in broomcorn millet in Northern Shaanxi |
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| DOI：10.7606/j.issn.1000-7601.2026.02.10 |
| Key Words: broomcorn millet limited supplementary irrigation nitrogen topdressing dry matter accumulation nitrogen transport yield northern Shaanxi |
| Author Name | Affiliation | | SHEN Jiaqi | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China | | CAO Hongxia | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China | | LIU Ningning | Yangling Chongyu Agriculture, Forestry and Water Conservancy Technology Group Co., Ltd., Yangling, Shaanxi 712100, China | | REN Liyu | Yangling Chongyu Agriculture, Forestry and Water Conservancy Technology Group Co., Ltd., Yangling, Shaanxi 712100, China | | CHEN Yuepu | Shaanxi Chongren Water Conservancy Engineering Co., Ltd., Xi’an, Shaanxi 710000, China | | LIU Jiaxuan | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China | | LI Zhijun | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| Taking ‘Yumei 2’ as the experimental material, supplementary irrigation and fertilization were carried out at the booting and the filling stage of the broomcorn millet. Three total nitrogen application levels (N1: 200 kg·hm-2, N2: 150 kg·hm-2, N3: 100 kg·hm-2) and three supplementary irrigation water levels (W1: 30 mm, W2: 22.5 mm, W3: 15 mm) were set up to study the effects of limited supplementary irrigation and nitrogen application at key growth stages on the growth characteristics, dry matter pre\|flowering translocation and post\|flowering accumulation, water and nitrogen use efficiency, and yield of broomcorn millet. The results showed that appropriate water and nitrogen supply impacts broomcorn millet growth. The leaf area index of N1W1 treatment increased by 6.00%-68.35% at heading stage, and the crop growth rate and photosynthetic potential from heading and flowering stage to filling stage increased by 4.08%-64.58% and 6.12%-64.18%, respectively. The application rate of nitrogen and irrigation water significantly affected the dry matter and nitrogen accumulation and translocation of broomcorn millet (P<0.05). The N1W1 treatment increased dry matter accumulation during maturity, pre\|flowering translocation, and post\|flowering accumulation by 5.94%-40.12%, 11.96%-102.83%, and 1.00%-25.87%, respectively. Nitrogen pre\|flowering translocation and post\|flowering accumulation increased by 7.93%-103.75% and 3.89%-41.52%, respectively. Post\|flowering dry matter and nitrogen accumulation contributed 73.21%-81.49% and 65.95%-73.6% to grain yield, respectively, both significantly higher than the pre\|flowering transport contribution rate. When the application rate of nitrogen reached 150 kg·hm-2, the dry matter accumulation in grains, the pre\|flowering translocation rate and the post\|flowering accumulation of dry matter would no longer increase significantly. The pre\|flowering translocation and post\|flowering accumulation of dry matter and nitrogen were significantly positively correlated with grain yield, and the correlation coefficient between post\|flowering dry matter accumulation and grain yield was the highest (R2=0.98). Grain yield increased with the increase of nitrogen application rate and irrigation water, with the N1W1 treatment yielding the highest (at 7 139.69 kg·hm-2), showing no significant difference from the N2W1 treatment. Water use efficiency peaked under the N1W1 and N2W1 treatments. The partial factor productivity of nitrogen decreased by 20.68%-79.27% with the increase of nitrogen application but increased by 5.31%-25.95% with the increase of irrigation water. The N2W1 treatment exhibited relatively high nitrogen fertilizer partial productivity. Therefore, based on the conditions of this experiment, considering the water and nitrogen use efficiency and reducing nitrogen input, the N2W1 treatment (total nitrogen application: 150 kg·hm-2, supplementary irrigation: 30 mm) is more suitable as a supplementary irrigation and fertilization model to increase the yield of broomcorn millet in northern Shaanxi. |
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