Crops ›› 2018, Vol. 34 ›› Issue (4): 69-78.doi: 10.16035/j.issn.1001-7283.2018.04.012

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Effects of Nitrogen Rates on the Nitrogen Use Efficiency and Agronomic Traits of Different Rice Cultivars

Zhang Xingchuan,Huang Wenxuan,Zhu Kuanyu,Wang Zhiqin,Yang Jianchang   

  1. College of Agronomy, Yangzhou University/Jiangsu Key Laboratory of Crop Genetics and Physiology/Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou 225009, Jiangsu, China
  • Received:2018-03-05 Revised:2018-06-13 Online:2018-08-20 Published:2018-08-23

Abstract:

The objective of the study was to understand the effects of nitrogen (N) rates on grain yield, N use efficiency (NUE), and agronomic traits of different rice cultivars. Twelve japonica rice cultivars (including indica/ japonica cultivars) suitable for planting in Jiangsu Province were field planted. Three N rates, 0N (no N application), 200N (200kg/hm 2) and 360N (360kg/hm 2) were applied in the experiment. The performances of grain yield, NUE and some agronomic traits were investigated. The results showed that the indica/japonica hybrid Yongyou 2640 had the highest grain yield among 12 tested cultivars under the three N application rates, mainly due to its large sink capacity. The response of grain yield to N rates varied with cultivars except for Yongyou 2640. Under the lower N rates (0N and 200N), the cultivars of Huaidao 13 and Wuyunjing 30 exhibited a higher yield, whereas the cultivars of Ningjing 1 and Yangjing 4038 produced a lower grain yield and NUE. However, a higher grain yield was observed for Ningjing 1 and Yangjing 4038 under a higher N rate (360N). The cultivars showed a higher grain yield and NUE under a lower N rates possessed a higher dry matter accumulation, more productive tillers, larger leaf area index, greater grain-leaf ratio and crop growth rate. These traits could be used as indexes in selecting a N-efficient rice cultivar.

Key words: Rice, Grain yield, Nitrogen use efficiency, Agronomic traits, Nitrogen-efficient cultivar

Table 1

Yield and its components of the tested rice cultivars"

施氮量(kg/hm2)
Nitrogen rate
品种
Cultivar
产量(t/hm2)
Yield
单位面积穗数(×104/hm2)
Panicles per unit area
每穗粒数
Grains per panicle
结实率(%)
Seed-setting rate
千粒重(g)
1000-grain weight
0 甬优2640 Yongyou 2640 8.49a 153h 261a 84.7a 25.2g
南粳9108 Nanjing 9108 6.27cd 272a 106h 80.7cd 27.0f
淮稻5号Huaidao 5 6.50bc 234cd 116g 84.3ab 28.4cde
淮稻13号Huaidao 13 6.34bc 185g 134c 83.7ab 30.6a
宁粳5号Ningjing 5 6.38bcd 242bc 108h 83.7ab 29.2b
宁粳1号Ningjing 1 5.96e 217e 120f 78.6d 29.0bc
武运粳30 Wuyunjing 30 6.42cd 198f 140b 85.5a 27.1f
武运粳24 Wuyunjing 24 6.09e 185g 141b 84.2ab 27.8e
扬粳4038 Yangjing 4038 5.83e 205f 119f 83.2abc 28.7bcd
连粳7号Lianjing 7 6.30cd 215e 126e 83.7ab 27.8e
连粳9号Lianjing 9 6.72bc 244b 118fg 83.0abc 28.1de
连粳11号Lianjing 11 7.02b 227d 130d 81.8bc 29.2b
200 甬优2640 Yongyou 2640 10.84a 174d 294a 79.8abcd 25.4c
南粳9108 Nanjing 9108 9.10de 303a 141de 78.0cde 27.5b
淮稻5号Huaidao 5 9.32cd 312a 130f 81.4a 28.2ab
淮稻13号Huaidao 13 9.87bc 267bc 154b 80.5abc 29.3a
宁粳5号Ningjing 5 8.53f 304a 131f 78.7bcde 27.4b
宁粳1号Ningjing 1 8.62f 298ab 132f 78.2cde 28.1ab
施氮量(kg/hm2)
Nitrogen rate
品种
Cultivar
产量(t/hm2)
Yield
单位面积穗数(×104/hm2)
Panicles per unit area
每穗粒数
Grains per panicle
结实率(%)
Seed-setting rate
千粒重(g)
1000-grain weight
武运粳30 Wuyunjing 30 9.93b 290abc 150bc 82.3a 27.8ab
武运粳24 Wuyunjing 24 9.39cd 290abc 149bc 81.1ab 27.5b
扬粳4038 Yangjing 4038 8.63e 262c 139de 81.3a 29.3a
连粳7号Lianjing 7 9.12d 295ab 136ef 80.3abc 28.4ab
连粳9号Lianjing 9 9.26d 294ab 142de 77.7de 28.6ab
连粳11号Lianjing 11 9.17d 281abc 145cd 76.7e 29.4a
360 甬优2640 Yongyou 2640 12.36a 217e 316a 71.9e 25.1c
南粳9108 Nanjing 9108 9.68c 315b 148bcd 76.6cd 27.2b
淮稻5号Huaidao 5 10.25b 316b 142cd 79.9ab 28.6ab
淮稻13号Huaidao 13 10.26b 279d 163b 78.6abc 28.6ab
宁粳5号Ningjing 5 9.37d 316b 142cd 76.8cd 27.3b
宁粳1号Ningjing 1 10.16b 338a 139d 77.8abc 27.7b
武运粳30 Wuyunjing 30 10.22b 293cd 161b 78.2abc 27.7b
武运粳24 Wuyunjing 24 9.92bc 282d 162b 79.8ab 27.2b
扬粳4038 Yangjing 4038 10.20b 292cd 153bcd 77.7bc 29.5a
连粳7号Lianjing 7 10.22b 319b 145cd 80.1a 27.7b
连粳9号Lianjing 9 9.73c 301bc 151bcd 76.9cd 28.0ab
连粳11号Lianjing 11 9.69c 290cd 156bc 75.2d 28.6ab

Table 2

Response of nitrogen utilization rate to nitrogen in the tested rice cultivars"

施氮量(kg/hm2)
Nitrogen rate
品种
Cultivar
总吸氮量
(kg/hm2)
Total N uptake
氮肥农学利用率(kg/kg)
AE
氮肥偏生产力(kg/kg)
PFP
子粒氮素利用率
(kg/kg)
NUE
氮素吸收利用率
(kg/kg)
RE
氮生理利用率
(kg/kg)
PE
0 甬优2640 Yongyou 2640 134.14a - - 63.39f - -
南粳9108 Nanjing 9108 97.66bc - - 64.21e - -
淮稻5号Huaidao 5 97.05bc - - 69.49ab - -
淮稻13号Huaidao 13 98.61bc - - 68.14b - -
宁粳5号Ningjing 5 91.01cd - - 70.15a - -
宁粳1号Ningjing 1 85.81de - - 65.73cd - -
武运粳30 Wuyunjing 30 97.12bc - - 68.25b - -
武运粳24 Wuyunjing 24 92.22bcd - - 66.08c - -
扬粳4038 Yangjing 4038 79.27e - - 65.34cd - -
连粳7号Lianjing 7 97.57bc - - 70.75a - -
连粳9号Lianjing 9 102.06b - - 65.93c - -
连粳11号Lianjing 11 99.44bc - - 70.73a - -
200 甬优2640 Yongyou 2640 196.84a 11.75f 54.20a 55.10e 35.90c 38.38bcd
南粳9108 Nanjing 9108 164.02bcde 14.15c 45.50c 55.50d 33.18de 42.69abc
淮稻5号Huaidao 5 164.58bcde 14.10c 46.60c 56.64c 33.77d 41.94abcd
淮稻13号Huaidao 13 173.27b 17.65a 49.35b 57.07b 37.33a 47.45ab
施氮量(kg/hm2)
Nitrogen rate
品种
Cultivar
总吸氮量
(kg/hm2)
Total N uptake
氮肥农学利用率(kg/kg)
AE
氮肥偏生产力(kg/kg)
PFP
子粒氮素利用率
(kg/kg)
NUE
氮素吸收利用率
(kg/kg)
RE
氮生理利用率
(kg/kg)
PE
宁粳5号Ningjing 5 152.97de 10.75g 42.65d 55.83d 30.98g 34.78cd
宁粳1号Ningjing 1 151.50e 13.30d 43.10d 56.90c 32.84e 40.50bcd
武运粳30 Wuyunjing 30 174.15b 17.55a 49.65b 57.03bc 38.52a 45.65ab
武运粳24 Wuyunjing 24 157.04cde 16.50b 46.95c 59.85a 32.41e 50.99a
扬粳4038 Yangjing 4038 151.65e 14.00c 43.15d 56.94c 36.19b 38.89bcd
连粳7号Lianjing 7 167.95bc 14.10c 45.60c 54.31f 35.19c 40.07bcd
连粳9号Lianjing 9 161.20bcde 12.70e 46.30c 57.46b 29.57f 43.38abc
连粳11号Lianjing 11 166.29bcd 10.75g 45.85c 55.15e 33.43d 32.26d
360 甬优2640 Yongyou 2640 243.15a 10.78cd 34.36a 50.86c 30.28ab 35.50e
南粳9108 Nanjing 9108 182.01cd 9.47f 26.89d 53.19b 23.43c 40.43a
淮稻5号Huaidao 5 201.56b 10.42e 28.47b 50.95c 29.03b 35.02e
淮稻13号Huaidao 13 205.87b 10.89c 28.50b 49.85cd 29.79ab 34.83ef
宁粳5号Ningjing 5 174.09d 8.31f 26.03e 53.86ab 23.08c 36.25d
宁粳1号Ningjing 1 200.04b 11.67b 28.22b 50.80c 31.73ab 38.46c
武运粳30 Wuyunjing 30 206.58b 10.56de 28.39b 49.49d 30.41ab 33.90f
武运粳24 Wuyunjing 24 194.99bc 10.64cde 27.56c 50.89c 28.55b 37.27c
扬粳4038 Yangjing 4038 200.92b 12.14a 28.33b 50.79c 33.79a 39.16b
连粳7号Lianjing 7 204.16b 10.89c 28.39b 50.09cd 29.61ab 34.17f
连粳9号Lianjing 9 183.85cd 8.36f 27.03cd 52.97b 22.72d 36.82d
连粳11号Lianjing 11 179.47d 7.42h 26.92d 54.07a 22.23d 33.40g

Table 3

Plant height and percentage of productive tillers of the tested rice cultivars"

施氮量
(kg/hm2)
Nitrogen rate
品种
Cultivar
株高(cm)
Plant height
单位面积茎蘖数Tillers per unit area (×104/hm2) 成穗率(%)
Productive tillers
分蘖期
Tillering
穗分化期
Panicle initiation
抽穗期
Heading
成熟期
Maturity
0 甬优2640 Yongyou 2640 115.8a 125f 195f 162i 153h 78.5ab
南粳9108 Nanjing 9108 96.0c 249a 336a 288a 272a 81.0a
淮稻5号Huaidao 5 96.4c 219b 295b 248bc 234bc 79.3ab
淮稻13号Huaidao 13 97.6c 183de 239de 202h 185g 77.3bc
宁粳5号Ningjing 5 97.3c 225b 303b 257b 242b 79.9ab
宁粳1号Ningjing 1 87.2d 201c 271c 230de 217de 80.1ab
武运粳30 Wuyunjing 30 97.1c 179de 246de 206gh 198fg 80.5a
武运粳24 Wuyunjing 24 95.9c 173e 233e 196h 185g 79.4ab
扬粳4038 Yangjing 4038 104.6b 187d 252d 217fg 205ef 81.3a
连粳7号Lianjing 7 90.2cd 202c 273c 228ef 215de 78.8ab
连粳9号Lianjing 9 86.6d 225b 304b 259b 244b 80.3a
连粳11号Lianjing 11 91.2cd 219b 298b 241cd 227cd 76.2c
200 甬优2640 Yongyou 2640 120.6a 149e 232e 186d 174d 75.0c
南粳9108 Nanjing 9108 101.8bc 270b 385b 320b 302ab 78.7a
淮稻5号Huaidao 5 102.6bc 300a 415a 350a 312a 75.1c
施氮量
(kg/hm2)
Nitrogen rate
品种
Cultivar
株高(cm)
Plant height
单位面积茎蘖数Tillers per unit area (×104/hm2) 成穗率(%)
Productive tillers
分蘖期
Tillering
穗分化期
Panicle initiation
抽穗期
Heading
成熟期
Maturity
淮稻13号Huaidao 13 102.8bc 250cd 357c 286c 270c 74.8c
宁粳5号Ningjing 5 99.2cde 299a 428a 318b 300ab 71.0e
宁粳1号Ningjing 1 90.2f 312a 416a 347a 298ab 71.6de
武运粳30 Wuyunjing 30 100.5bcd 260bc 370bc 310b 292b 78.4ab
武运粳24 Wuyunjing 24 99.5cde 260bc 371bc 305b 288b 78.2ab
扬粳4038 Yangjing 4038 106.0b 237d 338d 279c 263c 77.5ab
连粳7号Lianjing 7 94.7def 269b 384b 311b 293b 76.8b
连粳9号Lianjing 9 94.3ef 265bc 378b 316b 298ab 77.8ab
连粳11号Lianjing 11 95.6def 273b 384b 322b 304ab 73.0d
360 甬优2640 Yongyou 2640 128.4a 198h 309g 234f 217f 70.2ef
南粳9108 Nanjing 9108 107.9bcd 287de 421cde 334bc 315bc 74.8bc
淮稻5号Huaidao 5 106.2cde 295cd 438bc 339abc 316bc 72.1de
淮稻13号Huaidao 13 108.0bcd 260g 382f 296e 279e 73.0cd
宁粳5号Ningjing 5 109.8bc 312ab 459ab 335bc 316bc 68.8f
宁粳1号Ningjing 1 95.9g 324a 476a 358a 338a 71.0de
武运粳30 Wuyunjing 30 108.8bc 265fg 389ef 311de 293de 75.3b
武运粳24 Wuyunjing 24 104.2def 271fg 398def 310de 282e 70.9de
扬粳4038 Yangjing 4038 112.1b 257g 377f 303de 292de 77.5a
连粳7号Lianjing 7 100.2fg 302bc 425cd 354ab 319b 75.4b
连粳9号Lianjing 9 102.8ef 276ef 405def 318cd 301cd 74.3bc
连粳11号Lianjing 11 99.7fg 270fg 398def 307de 290de 72.9cd

Table 4

The leaf area index and effective and high-effective leaf area rate of the tested rice cultivars during different growth periods"

施氮量(kg/hm2)
Nitrogen rate
品种
Cultivar
拔节期
Jointing
抽穗期Heading 成熟期
Maturity
总叶面积指数
Total LAI
有效叶面积率(%)
Effective leaf area rate
高效叶面积率(%)
High effective leaf area rate
0 甬优2640 Yongyou 2640 4.92a 7.25a 95.07a 86.10a 2.24a
南粳9108 Nanjing 9108 4.32cd 6.62bc 90.90abc 70.56de 1.56e
淮稻5号Huaidao 5 4.68b 6.68bc 91.92ab 70.68de 1.78b
淮稻13号Huaidao 13 4.42c 6.41c 91.49ab 72.16d 1.68c
宁粳5号Ningjing 5 3.56g 5.81de 92.60ab 67.30f 1.62d
宁粳1号Ningjing 1 3.52g 5.65e 92.39ab 68.69ef 1.52ef
武运粳30 Wuyunjing 30 4.90a 6.89b 90.18bc 71.84d 1.75b
武运粳24 Wuyunjing 24 4.01e 5.83de 94.66a 70.84de 1.46fg
扬粳4038 Yangjing 4038 4.19d 6.04d 86.92c 71.85d 1.37h
连粳7号Lianjing 7 4.01e 5.79de 92.75ab 76.75c 1.45g
连粳9号Lianjing 9 3.81f 5.67e 90.67abc 80.62b 1.50efg
连粳11号Lianjing 11 3.96e 5.93de 92.07ab 81.99b 1.48fg
200 甬优2640 Yongyou 2640 6.10a 9.13a 95.51a 78.74bc 2.86b
南粳9108 Nanjing 9108 5.06e 7.87bcde 92.25ab 73.12de 2.08f
淮稻5号Huaidao 5 5.52bc 7.76bcde 89.93b 76.79bcd 2.19e
施氮量(kg/hm2)
Nitrogen rate
品种
Cultivar
拔节期
Jointing
抽穗期Heading 成熟期
Maturity
总叶面积指数
Total LAI
有效叶面积率(%)
Effective leaf area rate
高效叶面积率(%)
High effective leaf area rate
淮稻13号Huaidao 13 5.07e 7.46e 92.21ab 80.71b 2.35d
宁粳5号Ningjing 5 4.08f 6.77f 92.02ab 68.92ef 2.98a
宁粳1号Ningjing 1 4.19f 6.83f 90.21ab 67.20f 1.75h
武运粳30 Wuyunjing 30 5.57b 8.03bc 91.66ab 79.83bc 2.13ef
武运粳24 Wuyunjing 24 5.17de 7.63cde 91.33ab 69.20ef 2.49c
扬粳4038 Yangjing 4038 5.33cd 7.58de 92.61ab 85.49a 1.79h
连粳7号Lianjing 7 5.48bc 7.95bcd 94.48ab 75.88cd 1.89g
连粳9号Lianjing 9 5.44bc 8.13b 95.19ab 77.49bcd 1.95g
连粳11号Lianjing 11 5.32cd 8.08b 93.84ab 76.16bcd 1.78h
360 甬优2640 Yongyou 2640 6.48a 9.64a 96.05a 75.40abc 3.11bc
南粳9108 Nanjing 9108 5.50de 8.69bcde 88.95cde 72.73bc 2.64g
淮稻5号Huaidao 5 5.77c 8.48cdef 85.48e 77.37abc 2.58g
淮稻13号Huaidao 13 5.50de 8.34def 87.77de 80.58a 2.98cd
宁粳5号Ningjing 5 4.67g 7.50g 88.40cde 72.93bc 3.36a
宁粳1号Ningjing 1 5.21f 8.25ef 95.24ab 79.79a 2.89de
武运粳30 Wuyunjing 30 6.09b 8.82bc 90.02bcde 73.92bc 2.71fg
武运粳24 Wuyunjing 24 5.41e 8.22f 90.23bcde 72.40c 3.16b
扬粳4038 Yangjing 4038 5.90bc 8.65bcdef 96.15a 79.58a 3.10bc
连粳7号Lianjing 7 5.88c 8.93b 89.47bcde 76.04abc 2.83ef
连粳9号Lianjing 9 5.87c 8.76bcd 93.91abc 78.03ab 2.10h
连粳11号Lianjing 11 5.69cd 8.76bcd 92.12abcd 76.20abc 2.23h

Table 5

Grain/Leaf area of the tested rice cultivars"

施氮量(kg/hm2)
Nitrogen rate
品种
Cultivar
颖花/叶面积(个/cm2)
Spikelets/Leaf area (Number/cm2)
实粒/叶面积(粒/cm2)
Grains/Leaf area (Number/cm2)
粒重/叶面积(mg/cm2)
Grain weight/Leaf area
0 甬优2640 Yongyou 2640 0.55a 0.47a 12.73a
南粳9108 Nanjing 9108 0.43ef 0.38c 10.47cd
淮稻5号Huaidao 5 0.45fg 0.36cd 10.83cd
淮稻13号Huaidao 13 0.46g 0.39c 11.27bc
宁粳5号Ningjing 5 0.45de 0.33cd 10.02d
宁粳1号Ningjing 1 0.46cde 0.35de 10.55cd
武运粳30 Wuyunjing 30 0.46g 0.39c 11.20bc
武运粳24 Wuyunjing 24 0.45de 0.36cd 11.44bc
扬粳4038 Yangjing 4038 0.40fg 0.34e 10.65cd
连粳7号Lianjing 7 0.47cd 0.39c 11.90bc
连粳9号Lianjing 9 0.51b 0.42b 12.65ab
连粳11号Lianjing 11 0.49bc 0.40bc 12.73a
200 甬优2640 Yongyou 2640 0.56abc 0.45abc 11.83ab
南粳9108 Nanjing 9108 0.54abc 0.42abcd 10.60cd
淮稻5号Huaidao 5 0.58a 0.47a 12.26a
淮稻13号Huaidao 13 0.55abc 0.44abc 11.98a
宁粳5号Ningjing 5 0.49cd 0.46ab 10.32d
施氮量(kg/hm2)
Nitrogen rate
品种
Cultivar
颖花/叶面积(个/cm2)
Spikelets/Leaf area (Number/cm2)
实粒/叶面积(粒/cm2)
Grains/Leaf area (Number/cm2)
粒重/叶面积(mg/cm2)
Grain weight/Leaf area
宁粳1号Ningjing 1 0.50cb 0.46ab 10.57cd
武运粳30 Wuyunjing 30 0.54abc 0.44abc 11.37bc
武运粳24 Wuyunjing 24 0.52bc 0.45abc 11.30bc
扬粳4038 Yangjing 4038 0.48d 0.39d 10.39d
连粳7号Lianjing 7 0.50cd 0.40cd 10.97c
连粳9号Lianjing 9 0.51bc 0.40cd 10.40d
连粳11号Lianjing 11 0.51bc 0.41bcd 11.18bc
360 甬优2640 Yongyou 2640 0.72a 0.47a 11.20a
南粳9108 Nanjing 9108 0.53cd 0.41bc 10.14c
淮稻5号Huaidao 5 0.51d 0.41bc 12.30bc
淮稻13号Huaidao 13 0.55bcd 0.43bc 11.24ab
宁粳5号Ningjing 5 0.60b 0.40ab 11.50a
宁粳1号Ningjing 1 0.58bc 0.40abc 11.62a
武运粳30 Wuyunjing 30 0.53cd 0.41bc 10.49bc
武运粳24 Wuyunjing 24 0.53cd 0.42bc 10.96b
扬粳4038 Yangjing 4038 0.52cd 0.41bc 10.96b
连粳7号Lianjing 7 0.54bcd 0.43bc 11.03ab
连粳9号Lianjing 9 0.52cd 0.40bc 10.11c
连粳11号Lianjing 11 0.52d 0.39c 10.07c

Table 6

The accumulation of biomass and harvest index of the tested rice cultivars"

施氮量(kg/hm2)
Nitrogen rate
品种
Cultivar
干物质重Accumulation of biomass (t/hm2) 收获指数(%)
Harvest index
拔节期Jointing 抽穗期Heading 成熟期Maturity
0 甬优2640 Yongyou 2640 5.65a 12.25a 17.36a 48.9ab
南粳9108 Nanjing 9108 4.73cd 8.79c 13.65bcd 45.9cd
淮稻5号Huaidao 5 4.52d 8.84c 13.82bcd 47.0abcd
淮稻13号Huaidao 13 5.12b 9.06bc 14.06bc 45.1d
宁粳5号Ningjing 5 3.96g 8.12d 13.24bcd 48.2abc
宁粳1号Ningjing 1 3.25h 7.98d 12.18d 48.9ab
武运粳30 Wuyunjing 30 4.89c 9.08bc 13.08bcd 49.1ab
武运粳24 Wuyunjing 24 4.56d 9.27b 12.98bcd 46.9abcd
扬粳4038 Yangjing 4038 4.03fg 8.34d 12.36cd 47.2abcd
连粳7号Lianjing 7 4.22eg 8.94bc 13.58bcd 46.4bcd
连粳9号Lianjing 9 4.52d 8.82c 13.79bcd 48.7ab
连粳11号Lianjing 11 4.30e 9.10bc 14.21b 49.4a
200 甬优2640 Yongyou 2640 6.52a 14.65a 22.35a 46.3a
南粳9108 Nanjing 9108 5.87bcd 12.13cde 20.55cd 44.3bc
淮稻5号Huaidao 5 5.74d 12.85b 20.76bcd 43.4c
淮稻13号Huaidao 13 6.02b 13.02b 21.43abc 46.1ab
宁粳5号Ningjing 5 5.19f 11.85e 18.64f 45.8ab
宁粳1号Ningjing 1 4.88g 12.03de 18.29f 47.1a
武运粳30 Wuyunjing 30 5.68d 12.65b 21.66ab 45.8ab
武运粳24 Wuyunjing 24 5.48e 13.15b 20.39cd 46.1ab
施氮量(kg/hm2)
Nitrogen rate
品种
Cultivar
干物质重Accumulation of biomass (t/hm2) 收获指数(%)
Harvest index
拔节期Jointing 抽穗期Heading 成熟期Maturity
扬粳4038 Yangjing 4038 4.98g 11.84e 19.03ef 45.3ab
连粳7号Lianjing 7 5.82bcd 12.55bcd 20.06de 45.5ab
连粳9号Lianjing 9 5.79cd 12.78b 20.13d 46.0ab
连粳11号Lianjing 11 5.97bc 12.73b 19.98de 45.9ab
360 甬优2640 Yongyou 2640 7.28a 17.12a 27.85a 43.8bc
南粳9108 Nanjing 9108 6.24cde 13.25de 22.08de 45.7a
淮稻5号Huaidao 5 6.13de 13.45de 22.42cde 44.7abc
淮稻13号Huaidao 13 6.30cd 13.95cd 23.25bc 42.9c
宁粳5号Ningjing 5 5.81f 13.12e 21.86de 44.4abc
宁粳1号Ningjing 1 5.73f 13.72cde 22.87bcd 44.0abc
武运粳30 Wuyunjing 30 6.19cde 13.95cd 23.25bc 45.4ab
武运粳24 Wuyunjing 24 6.05e 14.82b 21.84de 44.6abc
扬粳4038 Yangjing 4038 5.67f 13.73cde 22.88bcd 42.9c
连粳7号Lianjing 7 6.27cde 14.31bc 23.85b 44.6abc
连粳9号Lianjing 9 6.36bc 13.69cde 21.82de 44.8ab
连粳11号Lianjing 11 6.52b 13.52de 21.63e 48.9abc

Table 7

Growth rate of population and net assimilation rate of the tested rice cultivars"

施氮量
(kg/hm2)
Nitrogen rate
品种
Cultivar
群体生长率Growth rate of population [g/(m2·d)] 净同化率Net assimilation rate [g/(m2·d)]
拔节期-抽穗期
Jointing-Heading
抽穗期-成熟期
Heading-Maturity
拔节期-抽穗期
Jointing-Heading
抽穗期-成熟期
Heading-Maturity
0 甬优2640 Yongyou 2640 25.38a 8.51a 4.23a 2.76a
南粳9108 Nanjing 9108 14.30d 7.91b 2.28e 2.20ab
淮稻5号Huaidao 5 13.09e 8.30a 2.33e 2.23ab
淮稻13号Huaidao 13 14.71d 8.47a 2.37e 2.42ab
宁粳5号Ningjing 5 11.24f 6.85e 2.45e 2.01b
宁粳1号Ningjing 1 13.18e 7.00d 3.28bc 2.03b
武运粳30 Wuyunjing 30 14.78d 8.02b 2.54de 2.48ab
武运粳24 Wuyunjing 24 15.70cd 6.40e 3.23c 2.02b
扬粳4038 Yangjing 4038 13.47e 7.05d 2.26e 2.24ab
连粳7号Lianjing 7 14.75d 7.48c 3.05c 2.39ab
连粳9号Lianjing 9 16.54c 7.53c 3.54b 2.40ab
连粳11号Lianjing 11 20.00b 7.86bc 4.10a 2.45ab
200 甬优2640 Yongyou 2640 38.96a 15.50ab 5.20a 4.58a
南粳9108 Nanjing 9108 18.97e 13.58c 2.98e 3.12abc
淮稻5号Huaidao 5 21.55d 13.64c 3.28de 3.10abc
淮稻13号Huaidao 13 22.58d 14.50b 3.65cd 3.27ab
宁粳5号Ningjing 5 18.00e 10.31e 3.39de 2.89bc
宁粳1号Ningjing 1 18.34e 12.21d 3.14e 2.84bc
武运粳30 Wuyunjing 30 21.78d 16.09a 4.24b 3.62a
武运粳24 Wuyunjing 24 25.57c 12.70b 4.05b 2.77bc
扬粳4038 Yangjing 4038 19.44de 12.07d 3.35de 3.06abc
施氮量
(kg/hm2)
Nitrogen rate
品种
Cultivar
群体生长率Growth rate of population [g/(m2·d)] 净同化率Net assimilation rate [g/(m2·d)]
拔节期-抽穗期
Jointing-Heading
抽穗期-成熟期
Heading-Maturity
拔节期-抽穗期
Jointing-Heading
抽穗期-成熟期
Heading-Maturity
连粳7号Lianjing 7 21.03d 12.81cd 3.17e 2.92bc
连粳9号Lianjing 9 26.88bc 13.31c 4.01bc 2.62c
连粳11号Lianjing 11 28.17b 13.51c 4.27b 2.76bc
360 甬优2640 Yongyou 2640 37.85a 16.51abc 4.76a 3.86a
南粳9108 Nanjing 9108 21.24e 14.48cde 3.05h 2.85bcd
淮稻5号Huaidao 5 22.18de 16.02abc 3.15gh 3.23abc
淮稻13号Huaidao 13 24.68cd 16.91abc 3.62def 3.25abc
宁粳5号Ningjing 5 19.76e 18.21a 3.31fgh 2.52d
宁粳1号Ningjing 1 24.97c 15.51bcd 3.82cde 3.08abc
武运粳30 Wuyunjing 30 24.25cd 17.22ab 3.29fgh 3.32ab
武运粳24 Wuyunjing 24 29.23b 12.76e 4.35ab 2.40d
扬粳4038 Yangjing 4038 25.19c 16.94abc 3.53defg 3.15abc
连粳7号Lianjing 7 25.13c 16.17abc 3.44efgh 3.04abc
连粳9号Lianjing 9 28.19b 13.11de 3.90cd 2.82bcd
连粳11号Lianjing 11 29.17b 13.30de 4.10bc 2.78cd
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