PDF
Full
Outline
In order to determine the effect of nitrogen application rate on the yield formation ofextremely late sowing winter wheat in northern Xinjiang, Xindong 18 was selected as the material and randomized block experimental design was adopted. Five nitrogen treatments of 0 kg·hm-2 (N0), 75 kg·hm-2 (N1), 150 kg·hm-2 (N2), 225 kg·hm-2 (N3) and 300 kg·hm-2 (N4) were set up in the field. The leaf area index, dry matter accumulation, plant nitrogen accumulation, nitrogen fertilizer absorption and utilization efficiency and their relationship with yield were systematically studied. The results showed that: with the increase the amount of nitrogen application, the leaf area index, total photosynthetic potential, the accumulation of dry matter, and the number of days of rapid accumulation of dry matter increased, among which maximum leaf area index (4.57-4.76 and 4.58-4.79) and total photosynthetic potential (181.50-206.43 m2·d·m-2 and 185.09-208.13 m2·d·m-2), maximum dry matter accumulation (19 903.28-21 821.78 kg·hm-2 and 20 519.38-22 249.95 kg·hm-2) and duration of rapid dry matter accumulation (26.2-27.3 d and 26.6-27.3 d) were significantly higher under N3 and N4 treatments than those under the remaining treatments. There was no significant difference between N3 and N4 treatments. With the increase of N application rate, nitrogen accumulation in grains at maturity was increased; nitrogen transfer before anthesis was increased, with all organs ranking as leaf > stem sheath > spike. Soil nitrogen contribution rate, nitrogen fertilizer utilization efficiency, nitrogen fertilizer absorption efficiency and nitrogen harvesting index all showed a downward trend with the increase of nitrogen application amount. The utilization efficiency of nitrogen fertilizer and nitrogen fertilizer agronological efficiency has a tendency to rise first and then decline, among which N3 treatment was the largest (60.52%-65.64% and 6.35-12.48 kg·kg-1). The grain yield of N3 treatment was highest, 21.27%-40.51% higher than that of N0 treatment. Under the conditions of this experiment, the optimum nitrogen application rate of winter wheat in extremely late sowing in northern Xinjiang was 225 kg·hm-2 (150 kg·hm-2 at jointing stage + 75 kg·hm-2 at booting stage).
PDF
24
6
| 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 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62199257
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
