Crops ›› 2022, Vol. 38 ›› Issue (4): 249-254.doi: 10.16035/j.issn.1001-7283.2022.04.035

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Effects of Different Nitrogen Application Rates on Photosynthetic Characteristics and Nitrogen Photosynthetic Utilization Efficiency of Fed Oats

Zheng Minna(), Liang Xiuzhi, Kang Jiahui, Li Yinfan, Wang Hui, Han Zhishun, Chen Yanni   

  1. High Latitude Crops Institute, Shanxi Agricultural University, Datong 037008, Shanxi, China
  • Received:2022-02-12 Revised:2022-06-15 Online:2022-08-15 Published:2022-08-22

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Abstract:

In order to explore the differences of photosynthetic characteristics and nitrogen use efficiency of fed oats under different nitrogen application rates in northern Shanxi province, four typical forage oat varieties were used as experimental materials to study the biological yield, photosynthetic characteristics and nitrogen photosynthetic efficiency. The findings indicated that hay yields of four varieties increased with the increase of nitrogen application rates, and the nitrogen application rate of 180kg/ha produced the maximum hay yields. Net photosynthetic rate and nitrogen photosynthetic utilization efficiency both grew steadily with the increase of nitrogen application rate. The amount of field nitrogen application could be regulated at 180kg/ha during the production of Mengyan No.1, Sweet oats, KONA, and Bayan No.7 in northern Shanxi province according to the complete indicators.

Key words: Fed oats, Nitrogen application rate, Hay yield, Photosynthetic characteristics, Nitrogen photosynthetic utilization efficiency

Table 1

Sources and germination percentages of oat varieties in the experiment"

编号
Number		 品种
Variety		 来源
Source		 发芽率
Germination
percentage (%)
1 蒙燕1号 内蒙古自治区农牧业科学院 98.5
2 甜燕麦 西藏海北农牧研究院 99.2
3 KONA 中国农业大学 98.9
4 坝燕7号 河北省高寒作物研究所 99.0

Table 2

Effects of nitrogen administration on plant height and hay yield of fed oats"

品种
Variety		 处理
Treatment		 株高
Plant height (cm)		 干草产量
Hay yield (kg/hm2)
蒙燕1号
Mengyan No.1		 N0 90.66±8.88b 7015.23±123.61b
N1 102.82±9.35a 8319.16±222.32ab
N2 103.56±9.02a 8612.36±236.12a
平均值 99.01 7982.25
KONA N0 80.36±5.36b 6023.45±99.64b
N1 90.10±6.33a 7051.86±102.45a
N2 94.56±9.01a 7836.15±136.42a
平均值 88.34 6970.49
甜燕麦
Sweet oat		 N0 102.36±7.86b 7964.25±262.45b
N1 117.11±10.36a 8896.86±239.66ab
N2 118.12±11.22a 9945.37±258.41a
平均值 112.53 9213.49
坝燕7号
Bayan No.7		 N0 82.16±4.78b 6627.19±194.31c
N1 96.23±5.67b 7405.70±185.24b
N2 99.31±6.02a 7936.69±206.98a
平均值 92.57 7323.19
F * **
V * *
F×V ns *

Table 3

Effects of nitrogen application rate on the photosynthetic properties of fed oats"

品种
Variety		 处理
Treatment		 Pn
[μmol/(m2·s)]		 Ci
(μmol/mol)		 Gs
[mmol/(m2·s)]		 Tr
[mmol/(m2·s)]		 RCC LAI
蒙燕1号Mengyan No.1 N0 12.15±0.45b 3.10±0.05b 174.32±12.31b 255.40±25.30a 40.31±1.26b 3.03±0.36c
N1 12.72±0.51b 3.86±0.02a 188.41±13.20b 299.14±29.31a 44.67±3.12b 3.64±0.52b
N2 14.24±0.62a 3.80±0.10a 224.51±14.60a 321.12±33.63a 52.36±4.79a 4.16±0.55a
平均值 13.04 3.59 195.73 291.87 45.78 3.61
KONA N0 11.53±0.32b 3.25±0.05b 196.21±14.01b 169.32±20.12b 41.96±5.36b 4.51±0.75b
N1 12.19±0.48ab 4.16±0.15a 181.41±12.90b 314.73±32.62a 42.39±4.92b 4.91±0.86ab
N2 14.90±0.66a 3.92±0.12a 225.61±14.91a 234.34±24.13a 53.16±5.97a 5.21±0.94a
平均值 12.87 3.78 201.07 239.43 45.84 4.87
甜燕麦Sweet oat N0 11.25±0.29b 3.52±0.14b 180.22±13.41b 263.54±27.60a 41.35±5.14b 4.26±0.78c
N1 14.23±0.60a 3.99±0.16ab 236.11±15.13a 276.40±28.11a 46.23±5.88b 4.78±0.79b
N2 13.96±0.62ab 4.29±0.18a 226.40±14.71a 239.13±23.44a 53.32±6.02a 5.26±0.85a
平均值 13.15 3.93 214.23 259.67 46.97 4.77
坝燕7号Bayan No.7 N0 10.50±0.21c 3.45±0.13b 185.61±13.40b 316.24±32.10a 39.66±4.56b 3.02±0.23c
N1 12.70±0.49b 4.21±0.14a 243.90±15.64a 295.31±29.44a 41.78±5.12b 3.59±0.38b
N2 13.51±0.58a 4.19±0.17a 224.31±14.32a 216.44±22.60b 46.59±5.69a 4.02±0.61a
平均值 12.24 3.95 217.93 275.97 42.68 3.54
F ** ** ** ** * **
V ** ** ** * * *
F×V ** ** ** * ns *

Table 4

Correlations between photosynthetic property indicators and hay yield of each variety under different nitrogen doses"

指标Index Pn Ci Gs Tr RCC LAI 干草产量Hay yield
Pn 1
Ci 0.579* 1
Gs 0.744** 0.661* 1
Tr -0.472 -0.188 -0.315 1
RCC 0.879** 0.509 0.613* 0.652* 1
LAI 0.574 0.497 0.379 -0.631* 0.652* 1
干草产量Hay yield 0.695* 0.578* 0.543 -0.269 0.676* 0.457 1

Table 5

Effects of nitrogen application rate on specific leaf weight, leaf nitrogen content, Na, and PNUE"

品种
Variety		 处理
Treatment		 比叶重
Specific leaf weight (t/hm2)		 叶片氮含量
Leaf nitrogen content (g/kg)		 Na
(kg/hm2 )		 PNUE
[10μmol/(g·s)]
蒙燕1号Mengyan No.1 N0 0.21±0.01a 8.56±0.12c 1.80±0.11c 67.59±0.10a
N1 0.23±0.01a 15.04±0.15b 3.46±0.15b 36.77±0.15b
N2 0.23±0.01a 18.33±0.10a 4.22±0.12a 33.78±0.10b
平均值 0.22 13.98 3.16 46.05
KONA N0 0.23±0.01a 7.76±0.11b 1.75±0.20b 66.04±0.20a
N1 0.23±0.01a 14.64±0.13a 3.37±0.01a 41.20±0.01b
N2 0.23±0.01a 16.32±0.13a 3.67±0.01a 40.58±0.01b
平均值 0.23 12.91 2.93 47.61
甜燕麦Sweet oat N0 0.23±0.01a 7.68±0.05b 1.77±0.01b 63.69±0.01a
N1 0.23±0.01a 16.88±0.96ab 3.88±0.02a 36.65±0.02b
N2 0.23±0.01a 19.36±1.20a 4.45±0.21a 31.35±0.20b
平均值 0.23 14.64 3.37 43.89
坝燕7号Bayan No.7 N0 0.24±0.01a 8.24±0.05c 1.98±0.05c 53.09±0.05a
N1 0.24±0.01a 16.60±0.32b 3.98±0.02b 31.88±0.02b
N2 0.25±0.01a 23.62±2.10a 5.91±0.02a 22.88±0.02c
平均值 0.24 16.15 3.96 35.28
F ns ** ** **
V * * ** **
F×V ns * * ns

Table 6

Relationship between nitrogen application rate and photosynthetic properties, nitrogen utilization, and biological properties"

指标Index 与施氮量关系Relationship with nitrogen fertilizer (x)
Pn (y1) y1=-0.00003x2+0.0201x+11.358 (R2=0.768**)
Tr (y2) y2=-0.0128x2+1.6546x+251.01 (R2=0.384*)
Ci (y3) y3=-0.00005x2+0.012x+3.33 (R2=0.798**)
Gs (y4) y4=-0.001x2+0.4021x+184.080 (R2=0.514**)
RCC (y5) y5=-0.003x2+0.007x+40.82 (R2=0.835**)
LAI (y6) y6=-0.000006x2+0.0063x+3.705 (R2=0.380*)
比叶重Specific leaf weight (y7) y7=-0.0000007x2+0.00014x+0.2263 (R2=0.124ns)
叶片氮含量Leaf nitrogen content (y8) y8=-0.0003x2+0.1087x+8.06 (R2=0.892**)
Na (y9) y9=-0.00002x2+0.0259x+1.8219 (R2=0.837**)
PNUE (y10) y10=0.0015x2-0.4358x+62.603 (R2=0.880**)
饲草产量Hay yield (y11) y11=-0.0214x2+13.157x+6907.5 (R2=0.450**)
株高Plant height (y12) y12=0.003x2-0.4522x+88.885 (R2=0.207ns)
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