Crops ›› 2023, Vol. 39 ›› Issue (2): 126-130.doi: 10.16035/j.issn.1001-7283.2023.02.018

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Effects of Nitrogen Application Rates on Yield and Nitrogen Use Efficiency of Super Hybrid Rice Y-liangyou 900

Liu Yu(), Cao Jialin, Xiao Zhengwu, Zhang Mingyu, Chen Jia’na, Cao Fangbo, Huang Min()   

  1. College of Agronomy, Hunan Agricultural University/Key Laboratory of Crop Physiology and Molecular Biology of Ministry of Education, Changsha 410128, Hunan, China
  • Received:2021-12-08 Revised:2021-12-27 Online:2023-04-15 Published:2023-04-11

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Abstract:

In order to explore yield formation characteristics and nitrogen use efficiency of super hybird rice Y-liangyou 900 differing in nitrogen fertilizer treatments, field experiment were conducted in Liuyang, Hunan with four nitrogen application treatments, N0 (0kg/ha), N1 (120kg/ha), N2 (180kg/ha), N3 (240kg/ha) in 2020-2021. The results showed that the two-year yields were 8.77 and 8.82t/ha, respectively of Y-liangyou 900 in the N2 treatment, and were higher than that in the N0 and N1 treatments, and was not significantly different from the N3 treatment. There was no significant difference between effective panicles and spikelets per panicle between the fertilization treatments. Seed-setting rate under the N2 treatment was higher than that of the other two fertilization treatments, and the 1000-grain weight had a increasing tendency with the increase of nitrogen application. The total dry matter accumulation of N2 treatment was lower than that of N3 treatment, but its harvest index was higher than that of N3 treatment. With the increase of nitrogen application rate, nitrogen agronomic efficiency and nitrogen partial factor productivity of each treatment gradually decreased. N use efficiency for grain production and N harvest index of N2 treatment were higher than those of N3 treatment. Thus, under the conditions of this trial, nitrogen application rate of 180kg/ha was beneficial to ensure the high yield of super hybrid rice Y-liangyou 900 while achieving high nitrogen use efficiency.

Key words: Nitrogen application rate, Super hybrid rice, Yield, Nitrogen use efficiency

Table 1

Change of yield and its components of Y-liangyou 900 under different nitrogen application rates"

年份
Year		 处理
Treatment		 实际产量
Actual yield
(t/hm2)		 理论产量
Theoretical
yield (t/hm2)		 有效穗数
Effective panicles
(×104/hm2)		 穗粒数
Spikelets
per panicle		 结实率
Seed-setting
rate (%)		 千粒重
1000-grain
weight (g)
2020 N0 5.68c 6.32b 130.00b 266.50b 80.00a 22.80b
N1 8.28b 8.81a 153.33a 299.78a 77.33ab 24.79a
N2 8.77a 9.05a 153.33a 298.22a 79.00a 25.05a
N3 8.77a 9.71a 173.33a 299.11a 74.67b 25.09a
2021 N0 6.17b 6.07c 127.50b 283.84a 73.33a 22.89c
N1 8.17a 9.03b 165.83a 291.85a 74.00a 25.20b
N2 8.82a 9.83ab 167.50a 291.74a 79.33a 25.35b
N3 8.74a 9.94a 172.50a 293.34a 75.00a 26.20a

Table 2

Change of dry matter accumulation and harvest index of Y-liangyou 900 under different nitrogen application rates"

年份
Year		 处理
Treatment		 TP-PI PI-HD HD-MA 总干物质量
Total dry matter
(t/hm2)		 收获指数
Harvest
index (%)
积累量
Biomass (t/hm2)		 比例
Ratio (%)		 积累量
Biomass (t/hm2)		 比例
Ratio (%)		 积累量
Biomass (t/hm2)		 比例
Ratio (%)
2020 N0 3.10c 27.00 3.57b 31.10 4.81b 41.90 11.48c 47.33a
N1 4.56b 28.90 5.20a 32.95 6.02ab 38.15 15.78b 48.00a
N2 4.39b 26.85 5.04a 30.83 6.92ab 42.32 16.35ab 47.67a
N3 5.42a 29.22 5.74a 30.94 7.39a 39.84 18.54a 45.33a
2021 N0 3.46c 26.99 4.88a 38.07 4.48b 34.95 12.82b 40.67b
N1 4.71b 25.25 5.60a 30.03 8.34a 44.72 18.65a 41.67ab
N2 5.95a 32.08 6.94a 37.41 5.66ab 30.51 18.55a 45.33a
N3 5.91a 31.45 7.07a 37.63 5.81ab 30.92 18.80a 41.00ab

Table 3

Change of nitrogen use efficiency of Y-liangyou 900 under different nitrogen application rates"

年份
Year		 处理
Treatment		 氮肥吸收利用率
N recovery
efficiency (%)		 氮肥农学利用率
N agronomic
efficiency (kg/kg)		 氮肥偏生产力
N partial factor
productivity (kg/kg)		 氮肥籽粒生产效率
N internal utilization
efficiency (kg/kg)		 氮收获指数
N harvest index
(%)
2020 N1 39.50a 21.67a 68.97a 68.87a 63.67a
N2 34.67a 17.20b 48.73b 60.11ab 61.33ab
N3 41.67a 12.90c 36.55c 47.62b 57.00b
2021 N1 44.50a 16.65a 68.07a 48.50a 59.00a
N2 36.67a 14.75ab 49.03b 50.48a 61.00a
N3 38.00a 10.69b 36.40c 43.99a 53.67a
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