| Effects of combined application of nitrogen fertilizer and organic fertilizer on the growth, nitrogen use efficiency of brewing sorghum and soil N2O emission in saline\|alkali land |
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| DOI：10.7606/j.issn.1000-7601.2023.06.13 |
| Key Words: brewing sorghum combination of organic and inorganic fertilizers nitrogen utilization N2O emission |
| Author Name | Affiliation | | YANG Yixuan | Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010018, China | | QU Zhongyi | Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010018, China | | YANG Wei | Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010018, China | | LIU Qi | Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010018, China | | REN Enliang | Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010018, China | | JI Wentao | Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010018, China |
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| Abstract: |
| According to the principle of equal nitrogen replacement, a field plot experiment including 7 treatments of a non\|nitrogen fertilizer treatment, optimize the nitrogen fertilizer application rate of 180 kg·hm-2 single fertilizer, 40% organic fertilizer replacement fertilizer, 60% organic fertilizer replacement fertilizer, conventional nitrogen fertilizer application rate of 240 kg·hm-2 single fertilizer, 40% organic fertilizer replacement fertilizer, and 60% organic fertilizer replacement fertilizer was conducted to examine the effects of nitrogen fertilizer and organic fertilizer on the growth characteristics, nitrogen utilization efficiency and N2O emission of wine sorghum in saline soil of Hetao irrigation area. The results showed that: (1) under the same nitrogen application rate, the content of total nitrogen, alkali\|hydrolyzable nitrogen and organic matter in mature soil treated with 60% organic fertilizer instead of chemical fertilizer increased by 10.52%~12.77%, 36.36%~50.64% and 41.58%~51.33%, respectively, compared with that of treatment with chemical fertilizer alone. (2) Under the same nitrogen application rate, the sorghum yield of 40% organic fertilizer instead of chemical fertilizer treatment was higher than that of other fertilizer treatments, with an increase of 6.63%~15.72%. (3) Compared with other fertilization treatments, the nitrogen fertilizer utilization rate of 180 kg·hm-2 40% organic substitution treatment increased by 1.98%~22.84%, and the partial productivity of nitrogen fertilizer increased by 3.49~17.19 kg·kg-1. The agronomic utilization rate of nitrogen fertilizer in 40% organic substitution treatment with 240 kg·hm-2 nitrogen application rate was 0.48~6.11 kg·kg-1 higher than that in other fertilization treatments. (4) Under the same nitrogen application rate, the N2O emission of 60% organic substitution treatment was the smallest, which decreased by 41.50%~47.97% and 3.82%~11.52% respectively compared with the treatment of chemical fertilizer alone and 40% organic substitution treatment; 40% organic substitution treatment takes the second place. Based on the yield, growth status, nitrogen utilization rate and N2O emission of brewing sorghum, the replacement of 40% chemical fertilizer with organic fertilizer at 180 kg·hm-2 nitrogen fertilizer application rate was the more suitable nitrogen fertilizer application rate and organic ratio for brewing sorghum cultivation in the Hetao irrigation area. |
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