| Effects of nitrogen application rate and topdressing stage on dry matter accumulation and nitrogen utilization of summer maize under drip irrigation |
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| DOI：10.7606/j.issn.1000-7601.2023.02.14 |
| Key Words: summer maize integrated drip irrigation and fertilization system dry matter accumulation nitrogen utilization yield |
| Author Name | Affiliation | | LIU Shuai | College of Agronomy, Qingdao Agricultural University,Shandong Provincial Key Laboratory of Dryland Farming Technology, Qingdao, Shandong 266109, China | | XU Yufan | College of Agronomy, Qingdao Agricultural University,Shandong Provincial Key Laboratory of Dryland Farming Technology, Qingdao, Shandong 266109, China | | JIA Jing | College of Agronomy, Qingdao Agricultural University,Shandong Provincial Key Laboratory of Dryland Farming Technology, Qingdao, Shandong 266109, China | | MENG Fangang | College of Agronomy, Qingdao Agricultural University,Shandong Provincial Key Laboratory of Dryland Farming Technology, Qingdao, Shandong 266109, China | | ZHU Zixin | College of Agronomy, Qingdao Agricultural University,Shandong Provincial Key Laboratory of Dryland Farming Technology, Qingdao, Shandong 266109, China | | ZHANG Yulu | College of Agronomy, Qingdao Agricultural University,Shandong Provincial Key Laboratory of Dryland Farming Technology, Qingdao, Shandong 266109, China | | ZHAO Changxing | College of Agronomy, Qingdao Agricultural University,Shandong Provincial Key Laboratory of Dryland Farming Technology, Qingdao, Shandong 266109, China |
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| Abstract: |
| Summer maize hybrid ‘Zhengdan 958’ was selected as the test material and two nitrogen application levels of nitrogen application rate N1 (180 kg·hm-2) and N2 (210 kg·hm-2) were set to explore the effects of nitrogen application rate and timing of topdressing nitrogen on dry matter accumulation, yield formation and plant nitrogen transport and accumulation of summer maize under the conditions of drip irrigation and fertilizer integration. The combination of nitrogen application periods of S1(jointing stage + belling stage), S2(jointing stage + flowering stage), S3(jointing stage + belling stage + flowering stage) in nitrogen dressing period was designed. Under traditional irrigation conditions, the nitrogen application amount was 240 kg·hm-2, one\|time topdressing treatment for CK1 at jointing stage, and topdressing treatment for CK2 at jointing stage + belling stage were set up. There were 8 treatments in total. The results showed that compared with CK1, the accumulation of dry matter in the aboveground dry matter in the mature stage of N1S3 and N2S3 in 2020 increased by 6.91% and 8.30%, respectively, and increased by 2.28% and 3.90% in 2021. In 2020, the agronomic use efficiency and nitrogen fertilizer partial productivity of nitrogen fertilizer increased by 84.59%, 61.43%, and 55.44%， 34.60%, respectively, and in 2021, they increased by 90.82%, 64.38%, and 50.69%, 29.40%, respectively. In 2020, the nitrate nitrogen residues in 0~20 cm soil increased by 15.63 kg·hm-2 and 16.45 kg·hm-2, respectively, and increased by 5.19 kg·hm-2 and 5.64 kg·hm-2 in 2021. The yield increased by 16.56% and 17.77% in 2020 and 13.03% and 13.48% in 2021. Increasing the number of topdressings significantly increased the accumulation of dry matter in the above ground of summer maize, the agronomic use efficiency of nitrogen fertilizer, the productivity of nitrogen fertilizer bias and the nitrate nitrogen residue in 0~20 cm soil layer of maize plants, and the yield of summer maize based on the comprehensive analysis. The yield of N1S3 and N2S3 treatments was significantly higher than that of CK1, but there was no significant difference in each index between the two treatments. Compared with N2S3 treatment, N1S3 treatment reduced the input of nitrogen fertilizer, maintained higher dry matter accumulation, nitrogen accumulation and yield, and increased the agronomic use efficiency and partial productivity of nitrogen fertilizer. Therefore, N1S3 was the optimal treatment combination for this experiment. |
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