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Outline
To investigate the effects of different postponing nitrogen application treatments on oat grain yield and nitrogen accumulation and translocation, a randomized block design was adopted using two oat varieties Bayou 1 and Dingyou 8 as the experimental materials. Field trial were conducted in 2021 and 2022, and four nitrogen application treatments were set up under a total nitrogen rate of 100 kg·hm-2: all basal application (CK), 1/2 basal application + 1/2 tillering stage fertiliser (N1), 1/2 basal application + 1/2 jointing stage fertiliser (N2), 1/3 basal application + 1/3 tillering stage fertiliser + 1/3 jointing stage fertiliser (N3). The effects of different postponing nitrogen application treatments on yield of oats, dry matter accumulation and translocation in each organ, and nitrogen accumulation and translocation in each organ were determined and analysed. The results indicated that different postponing nitrogen application treatments had an extremely significant impact on oat yield. Compared with CK, the yield of both Bayou 1 and Dingyou 8 significantly increased in N3 treatment, with an average increase rate of 7.96%-8.82% over the two years. However, the yield of oats were reduced by 9.64%-4.50% and 4.12%-6.59% in N1 and N2 treatments respectively, N3 treatment enhanced the pre-anthesis dry matter and nitrogen translocation, post-anthesis dry matter, and nitrogen accumulation, with the increase rate of 21.83%-37.79%, 23.59%-30.19%, 7.58%-12.35%, and 8.48%-11.54%, respectively. Therefore, under a total nitrogen rate of 100 kg·hm-2, applying 1/3 basal application + 1/3 tillering stage fertiliser + 1/3 jointing stage fertiliser better coordinated the nitrogen accumulation and transport of oats, and improved the yield.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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