| Regulation of nitrogen\|dense interaction on yield and nitrogen fertilizer use efficiency of dryland potatoes and root mechanism |
|
View Fulltext View/Add Comment Download reader |
| |
| DOI：10.7606/j.issn.1000-7601.2025.06.10 |
| Key Words: potato nitrogen\|dense interaction root morphological root activity yield nitrogen fertilizer use efficiency |
| Author Name | Affiliation | | BAO Xiaoyan | College of Agronomy, Gansu Agricultural University, State Key Laboratory of Arid Land Crop Science, Lanzhou, Gansu 730070, China | | MENG Haofeng | College of Agronomy, Gansu Agricultural University, State Key Laboratory of Arid Land Crop Science, Lanzhou, Gansu 730070, China | | LI Lingling | College of Agronomy, Gansu Agricultural University, State Key Laboratory of Arid Land Crop Science, Lanzhou, Gansu 730070, China | | WANG Chunyan | College of Agronomy, Gansu Agricultural University, State Key Laboratory of Arid Land Crop Science, Lanzhou, Gansu 730070, China | | TIAN Xin | College of Agronomy, Gansu Agricultural University, State Key Laboratory of Arid Land Crop Science, Lanzhou, Gansu 730070, China | | WANG Xin | College of Agronomy, Gansu Agricultural University, State Key Laboratory of Arid Land Crop Science, Lanzhou, Gansu 730070, China | | WANG Weiqiang | College of Agronomy, Gansu Agricultural University, State Key Laboratory of Arid Land Crop Science, Lanzhou, Gansu 730070, China |
|
| Hits: 181 |
| Download times: 66 |
| Abstract: |
| This study aimed to explore the response of root morphology and root activity of dryland potatoes to the interactions of nitrogen application and cultivation density and its effect on yield and nitrogen fertilizer use efficiency, and to screen the nitrogen application rate and planting density suitable for potato production in the dryland area of central Gansu. The experiment was conducted during 2023-2024 with three nitrogen gradients (N0: no nitrogen fertilizer; N2: 200 kg·hm-2 nitrogen; N3: 300 kg·hm-2 nitrogen) and three cultivation densities (D1: 37 500 plants·hm-2; D2: 52 500 plants·hm-2; D3: 67 500 plants·hm-2). The effects of different nitrogen application rates and cultivation densities on root morphology,root activity, yield, and nitrogen use efficiency of potatoes were determined and analyzed. The results showed that the root morphology of potatoes under N2D2 treatment was better than that under other treatments. Compared with other treatments, the root dry weight of potato under N2D2 treatment increased by 9.54%~151.15% and 3.89%~134.41% during tuber swelling and starch accumulation stages,respectively, and the root surface area increased by 12.73% ~65.08% and 7.37%~91.03%, respectively. The root length and root projection area increased significantly by 3.89%~134.41% and 8.92%~72.43%, respectively, during the starch accumulation period. Root volume and root activity increased significantly by 13.89%~63.05% and 10.95%~72.46%, respectively. The yield and nitrogen use efficiency of N2D2 treatment were the highest. Compared with other treatments, the yield in 2023 and 2024 increased by 4.11%~150.32% and 3.94%~169.25%, respectively. The agronomic efficiency of nitrogen fertilizer increased by 6.94%~77.59% and 2.74%~108.56%, and the partial factor productivity of nitrogen fertilizer increased by 4.12%~94.21% and 3.95%~121.55%, respectively. In summary, the nitrogen application of 200 kg·hm-2 and cultivation density of 52 500 plants·hm-2 could effectively promote root dry mass,root surface area and root volume of potato per plant,enhance root activity, improve root absorption capacity, increase the number of potato per plant, thereby improving potato yield and nitrogen use efficiency. It is a suitable nitrogen\|dense interaction cultivation mode in the rainfed central Gansu Province. |
|
|
|