| Effects of deep application of nitrogen fertilizer on soil nutrient content and spring maize yield in dryland film mulched farmland |
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| DOI：10.7606/j.issn.1000-7601.2023.05.10 |
| Key Words: maize deep application of nitrogen fertilizer film\|mulching soil nutrients yield |
| 作者 | 单位 | | 高飞 | 甘肃省耕地质量建设保护总站,甘肃 兰州 730020 | | 任亮奇 | 西北农林科技大学农学院,陕西 杨凌 712100；农业农村部西北黄土高原作物生理生态与耕作重点实验室,陕西 杨凌 712100 | | 崔增团 | 甘肃省耕地质量建设保护总站,甘肃 兰州 730020 | | 郭世乾 | 甘肃省耕地质量建设保护总站,甘肃 兰州 730020 | | 郑杰 | 甘肃省耕地质量建设保护总站,甘肃 兰州 730020 | | 叶旭 | 西北农林科技大学农学院,陕西 杨凌 712100；农业农村部西北黄土高原作物生理生态与耕作重点实验室,陕西 杨凌 712100 | | 王钰皓 | 西北农林科技大学农学院,陕西 杨凌 712100；农业农村部西北黄土高原作物生理生态与耕作重点实验室,陕西 杨凌 712100 | | 张鹏 | 西北农林科技大学农学院,陕西 杨凌 712100；农业农村部西北黄土高原作物生理生态与耕作重点实验室,陕西 杨凌 712100 |
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| Abstract: |
| A field experiment with three nitrogen fertilizer application depths (D5: 5 cm, D15: 15 cm, and D25: 25 cm) and no nitrogen (N0) under double ridge and furrow plastic film mulching planting was carried out in Dingxi City, Gansu Province in 2021-2022. The effects of different nitrogen fertilizer application depths on soil nutrient content, dry matter accumulation, water use and maize yield were analyzed in order to provide a theoretical basis for optimizing fertilizer application mode and further improve its water\|saving and yield\|increasing efficiency. The results showed that with the increase of fertilization depth, the soil nutrient content in 0~40 cm was gradually increased. Compared with D15 and D5, the soil organic carbon, total nitrogen, available phosphorus and available potassium contents under D25 treatment were increased by 8.67%, 2.23%, 22.11% and 15.18%, respectively. The dry matter accumulation of maize was also significantly increased with the increase of fertilization depth, and D25 was 6.53% and 25.30% higher than D15 and D5 from 105 d after sowing to harvest, respectively. Each depth of fertilization treatment increased the water consumption and water use efficiency (P<0.05), which both gradually increased with the increase of fertilization depth. Compared with D5, the biomass and economic yield of maize under D25 were increased by 27.20% and 34.93%, respectively. These results showed that nitrogen fertilizer application at 25 cm depth can effectively improve soil nutrient content and water use efficiency, which is an effective measure to improve the maize yield under film\|mulched farmland in northwest of China. |
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