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作物学报 ›› 2022, Vol. 48 ›› Issue (3): 667-681.doi: 10.3724/SP.J.1006.2022.12018

• 耕作栽培·生理生化 • 上一篇    下一篇

氮密处理提高迟播栽粳稻资源利用和产量

袁嘉琦(), 刘艳阳*(), 许轲*(), 李国辉, 陈天晔, 周虎毅, 郭保卫, 霍中洋, 戴其根, 张洪程   

  1. 农业农村部长江流域稻作技术创新中心/江苏省作物栽培生理重点实验室/江苏省粮食作物现代产业技术协同创新中心/扬州大学水稻产业工程技术研究院, 江苏扬州225009
  • 收稿日期:2021-03-03 接受日期:2021-06-16 出版日期:2021-07-30 网络出版日期:2021-07-30
  • 通讯作者: 刘艳阳,许轲
  • 作者简介:E-mail: 1065249601@qq.com
  • 基金资助:
    国家重点研发计划项目(2017YFD030120102);国家重点研发计划项目(2017YFD0300102);江苏省重点研发计划项目(BE2017343);江苏高校优势学科建设工程项目资助

Nitrogen and density treatment to improve resource utilization and yield in late sowing japonica rice

YUAN Jia-Qi(), LIU Yan-Yang*(), XU Ke*(), LI Guo-Hui, CHEN Tian-Ye, ZHOU Hu-Yi, GUO Bao-Wei, HUO Zhong-Yang, DAI Qi-Gen, ZHANG Hong-Cheng   

  1. Innovation Center of Rice Cultivation Technology in Yangtze River Valley of Ministry of Agriculture/Jiangsu Key Laboratory of Crop Cultivation and Physiology/Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops/Research Institute of Rice Industrial Engineering Technology, Yangzhou University, Yangzhou 225009, Jiangsu, China
  • Received:2021-03-03 Accepted:2021-06-16 Published:2021-07-30 Published online:2021-07-30
  • Contact: LIU Yan-Yang,XU Ke
  • Supported by:
    National Key Research and Development Program of China(2017YFD030120102);National Key Research and Development Program of China(2017YFD0300102);Key Research and Development Projects of Jiangsu(BE2017343);Priority Academic Program Development of Jiangsu Higher Education Institutions

摘要:

苏中地区为稻麦两熟制地区, 近年来受气候变化和稻虾综合种养规模扩大的影响, 水稻迟播迟栽现象较为普遍, 使水稻品种的生长发育等与光、温资源不匹配, 成为制约水稻高产稳产的重要因素之一。本研究在迟播迟栽(6月12日播种、6月30日移栽)条件下, 采用毯苗机插方式, 设置4个纯氮施氮量(N0: 0 kg hm-2; N240: 240 kg hm-2; N300: 300 kg hm-2; N360: 360 kg hm-2)、3个穴栽苗株数(D3: 3株苗、D4: 4株苗、D5: 5株苗)处理, 以适播适栽期(5月29日)常规施氮量和穴栽苗株数处理(N300D4)为对照(CK), 探究氮肥水平与穴栽苗数对迟播迟栽粳稻生长发育和产量形成的影响, 为提升苏中地区迟播迟栽粳稻产量潜力和资源利用效率提供依据。结果表明, 较CK相比, 迟播迟栽条件下各处理产量均下降, 主要原因是迟播迟栽处理群体颖花量显著降低, 2年最高群体颖花量分别较CK分别降低11.94%和8.12%; 迟播迟栽条件下温光资源利用率降低, 植株吸氮量和氮肥利用率降低, 导致干物质积累量降低。迟播迟栽条件下, 除处理N360D5外, 随着施氮量和穴栽苗株数的增加, 产量增加。主要原因是提高了群体颖花量, 抽穗期叶面积指数和高效叶比例, 延长了生育期, 从而提高了温光资源利用率, 进而提高了成熟期干物质积累量, 缓解产量下降; 另外, 氮肥利用率随施氮量增加呈先增加后下降趋势, N300D5处理氮肥利用率最大。因此, 迟播迟栽条件下应首先考虑增加穴栽苗数, 再适量增加氮肥施用量, 可以缓解产量损失, 并提高氮肥利用率。

关键词: 粳稻, 迟播迟栽, 施氮量, 温光资源, 氮肥利用效率, 产量

Abstract:

Recently, the phenomenon of late sowing and late transplanting in rice is becoming more and more common in central Jiangsu, a rice and wheat double cropping system area, which is caused by climate change and the expanding of comprehensive rice-and-shrimp planting model. It will lead to the mismatch of rice growth period with light and temperature resources, restricting the stable high yield of rice. This study was conducted under the condition of late sowing and late transplanting (sowing date was June 12th, transplanting date was June 30th) and the seedling was transplanted by machine. Four nitrogen application rates (N0: 0 kg hm-2; N240: 240 kg hm-2; N300: 300 kg hm-2; N360: 360 kg hm-2) and three density treatments (D3: 3 seedlings per hole; D4: 4 seedlings per hole; D5: 5 seedlings per hole) were arranged, and the suitable sowing period (May 29), conventional nitrogen application rate, and the seedling number per hole (N300D4) were taken as the controls. Our goal is to explore the effects of nitrogen fertilizer and seedling number per hole on the growth and yield formation in late-sown japonica rice, and to provide theoretical basis for improving yield potential and resource use efficiency in late sowing and late transplanting japonica rice in central Jiangsu province. The results showed that compared with CK, the yield of each treatment decreased, mainly because of the significantly reduced spikelet number under the late sowing and late transplanting condition. The highest spikelet numbers were 11.94% and 8.12% lower than those of CK in the two years. In addition, the utilization rate of temperature and light resources, nitrogen uptake, and nitrogen utilization rate decreased under late sowing and late transplanting treatment, leading to a decrease in dry matter accumulation and yield. The yield increased with the increase of nitrogen application rate and seedling number per hole under the late sowing and late transplanting condition, while there was no consistent with the trend under N360D5 treatment. We assumed that it was mainly due to the increased spikelet number, larger leaf area index at heading stage, the larger proportion of efficient leaf, and the extended growth period. In summary, the utilization of temperature and light resources and the dry matter accumulation at maturity stage was improved, and the decline in yield was alleviated. Nitrogen use efficiency increased first and then decreased with the increase of nitrogen rate, and N300D5 treatment reached the maximum. In general, under the late sowing and late transplanting condition, in order to alleviate the yield loss and reduce nitrogen fertilizer waste, we should increase the seedling number per hole and then increase the amount of nitrogen fertilizer.

Key words: japonica rice, late sowing and late transplanting, nitrogen application rate, temperature and radiation resources, nitrogen use efficiency, yield

图1

2018-2019年兴化市水稻季气象资料"

表1

氮肥水平对迟播迟栽粳稻各阶段生育进程的影响"

年份
Year
处理
Treatment
播种-拔节期
Seed-Jointing
拔节-抽穗期
Jointing-Heading
抽穗-成熟期
Heading-Maturity
全生育期
Growth stage
天数
Days
缩短天数
Shorten days
天数
Days
缩短天数
Shorten days
天数
Days
缩短天数
Shorten days
天数
Days
缩短天数
Shorten days
2018 CK 60 33 62 155
迟播迟栽
Late sowing
N0 53 7 29 4 56 6 138 17
N240 53 7 30 3 57 5 140 15
N300 53 7 32 1 59 3 144 11
N360 53 7 33 0 59 3 145 10
2019 CK 61 33 62 156
迟播迟栽
Late sowing
N0 54 7 29 4 56 6 139 17
N240 54 7 30 3 57 5 141 15
N300 54 7 32 1 59 3 145 11
N360 54 7 33 0 59 3 146 10

表2

氮肥水平对迟播迟栽粳稻积温资源的影响"

年份Year 处理
Treatment
播种-拔节期
Seed-Jointing
拔节-抽穗期
Jointing-Heading
抽穗-成熟期
Heading-Maturity
全生育期
Growth stage
日均温
Daily mean temperature
(℃)
有效积温
Effective accumulated temperature (℃ d)
日均温
Daily mean temperature (℃)
有效积温
Effective accumulated temperature (℃ d)
日均温
Daily mean temperature (℃)
有效积温Effective
accumulated temperature
(℃ d)
日均温
Daily mean temperature (℃)
有效积温
Effective accumulated temperature (℃ d)
2018 CK 27.32 1056.60 28.66 615.90 19.61 595.90 25.20 2268.40
迟播迟栽
Late sowing
N0 28.55 1001.80 27.68 495.10 19.93 566.10 25.39 2063.00
N240 28.55 1001.80 27.33 520.00 19.56 544.80 25.15 2066.60
N300 28.55 1001.80 27.03 544.90 18.99 530.70 24.86 2077.40
N360 28.55 1001.80 26.88 557.20 18.92 526.10 24.78 2085.10
2019 CK 25.73 975.50 27.62 581.40 20.18 631.10 24.51 2188.00
迟播迟栽
Late sowing
N0 26.71 919.10 26.48 477.80 20.28 575.40 24.49 1972.30
N240 26.71 919.10 26.38 491.40 20.06 573.60 24.38 1984.10
N300 26.71 919.10 26.22 519.00 19.86 581.60 24.26 2019.70
N360 26.71 919.10 26.17 533.70 19.47 558.90 24.12 2011.70

表3

氮肥水平对迟播迟栽粳稻辐射资源的影响"

年份
Year
处理
Treatment
播种-拔节期
Seeding-Jointing
拔节-抽穗期
Jointing-Heading
抽穗-成熟期
Heading-Maturity
全生育期
Whole growth stage
日均辐射量
Daily mean radiation
(MJ m-2 d-1)
辐射量
Radiation
(MJ m-2)
日均辐射量
Daily mean radiation
(MJ m-2 d-1)
辐射量
Radiation
(MJ m-2)
日均辐射量
Daily mean radiation
(MJ m-2 d-1)
辐射量
Radiation
(MJ m-2)
日均辐射量
Daily mean radiation
(MJ m-2 d-1)
辐射量
Radiation
(MJ m-2)
2018 CK 21.45 1308.67 21.80 719.30 15.95 988.81 19.73 3016.77
迟播迟栽Late sowing N0 21.93 1184.04 20.67 578.67 15.99 911.19 19.53 2673.90
N240 21.93 1184.04 20.58 617.44 15.93 907.99 19.48 2709.47
N300 21.93 1184.04 20.54 657.41 15.64 922.88 19.37 2764.33
N360 21.93 1184.04 20.24 667.88 15.58 919.38 19.25 2771.30
2019 CK 19.41 1203.59 21.19 699.26 15.47 959.35 18.69 2862.19
迟播迟栽Late sowing N0 18.42 1013.00 19.58 567.71 15.67 877.77 17.89 2458.48
N240 18.42 1013.00 19.42 582.74 15.76 898.10 17.87 2493.83
N300 18.42 1013.00 19.05 609.50 15.81 932.61 17.76 2555.10
N360 18.42 1013.00 19.19 633.43 15.67 924.67 17.76 2571.10

表4

不同处理对迟播迟栽粳稻产量及其构成因素的影响"

年份
Year
处理
Treatment
产量
Yield
(t hm-2)
穗数
Panicles
(×106 hm-2)
每穗颖花数
Spikelets per panicle
群体颖花量
Population
spikelets
(×106 hm-2)
结实率
Grain filling percentage
(%)
千粒重
1000-grain weight
(g)
收获指数
Harvest index
2018 CK 12.06 a 4.10 a 136.90 a 560.66 a 89.55 a 25.50 ab 0.515 a
迟播迟栽
Late sowing
N0 D3 7.06 g 2.65 f 124.20 de 329.09 j 88.69 a 25.65 a 0.467 i
D4 7.33 fg 2.81 f 120.75 ef 338.59 i 88.42 a 25.60 a 0.470 h
D5 7.66 f 3.02 e 117.40 f 353.35 h 88.21 a 25.35 bc 0.481 g
N240 D3 8.84 e 3.17 e 129.30 bcd 409.45 g 86.78 b 25.25 cd 0.501 e
D4 9.24 e 3.44 d 125.20 cde 430.22 f 86.05 bc 25.05 de 0.507 c
D5 9.80 d 3.53 d 124.85 cde 440.24 e 85.27 bc 24.95 e 0.514 a
N300 D3 9.90 d 3.63 cd 132.65 ab 480.60 d 85.99 bc 25.00 e 0.504 d
D4 10.54 c 3.81 bc 129.05 bcd 491.53 bc 85.67 bc 25.00 e 0.510 b
D5 11.03 b 3.87 b 127.85 bcd 493.72 b 85.16 c 24.90 e 0.511 b
N360 D3 10.36 c 3.76 bc 130.30 bc 489.68 c 85.05 c 25.00 e 0.499 e
D4 10.80 bc 3.84 b 128.40 bcd 492.64 b 84.55 c 24.85 ef 0.500 e
D5 10.61 bc 3.89 b 126.10 cd 489.89 c 84.50 c 24.65 f 0.495 f
2019 CK 11.39 a 3.79 a 135.96 a 514.60 a 89.69 c 25.58 b 0.521 ab
迟播迟栽
Late sowing
N0 D3 6.86 i 2.41 h 122.42 de 295.22 k 92.90 a 26.58 a 0.496 h
D4 7.19 h 2.65 g 120.17 e 318.01 j 91.27 b 26.63 a 0.499 g
D5 7.41 h 2.87 f 114.15 f 326.86 i 90.49 bc 26.45 a 0.502 f
N240 D3 8.44 g 3.09 e 127.73 bc 394.37 h 87.12 d 25.65 b 0.518 d
D4 8.84 f 3.24 de 125.18 cd 404.51 g 86.75 de 25.66 b 0.520 bcd
D5 9.29 e 3.38 cd 124.47 cde 420.38 f 86.52 de 25.54 b 0.521 ab
N300 D3 9.60 d 3.38 cd 130.58 b 440.51 e 86.30 def 25.45 b 0.519 cd
D4 10.00 c 3.55 bc 128.96 bc 468.74 c 86.17 def 25.38 b 0.520 abc
D5 10.38 b 3.73 ab 127.33 bcd 472.82 b 86.13 def 25.10 bc 0.521 a
N360 D3 9.87 c 3.53 bc 129.11 bc 455.32 d 85.75 def 25.33 bc 0.502 f
D4 10.28 b 3.68 ab 128.32 bc 472.12 b 85.40 ef 24.98 bc 0.509 e
D5 9.99 c 3.73 ab 126.05 bcd 469.75 c 84.90 f 24.67 c 0.491 i
方差分析
ANOVA
年度Year (Y) 43.652** 37.159** 3.52ns 47.742** 47.491** 98.552**
施氮水平Nitrogen (N) 513.011** 232.446** 67.05** 380.885** 138.705** 89.482**
穴栽苗数Density (D) 103.58** 60.174** 16.538** 13.407** 7.775** 10.631**
Y×N 1.521ns 0.227ns 0.374ns 0.225ns 10.881** 12.744**
Y×D 1.524ns 0.586ns 0.392ns 0.692ns 0.083ns 0.128ns
N×D 9.956** 4.384* 0.894ns 5.77* 0.422ns 0.766ns
Y×N×D 0.317ns 0.524ns 0.110ns 0.336ns 0.988ns 0.586ns

表5

不同处理对迟播迟栽粳稻高峰苗及成穗率的影响"

年份
Year
处理
Treatment
高峰苗
Maximum seedling number
(×106 hm-2)
有效穗
Panicles
(×106 hm-2)
成穗率
Percentage of productive tiller
(%)
2018 CK 5.87 cd 4.01 a 69.85 a
迟播迟栽
Late sowing
N0 D3 4.09 i 2.65 f 64.72 bcd
D4 4.37 h 2.81 f 63.67 cde
D5 4.70 g 3.02 e 63.43 cde
N240 D3 4.77 g 3.17 e 66.34 b
D4 5.28 f 3.44 d 65.15 bc
D5 5.46 ef 3.53 d 64.62 bcd
N300 D3 5.65 de 3.63 cd 64.08 cde
D4 5.99 bc 3.81 bc 63.68 cde
D5 6.16 ab 3.87 b 62.72 def
N360 D3 5.98 bc 3.76 bc 62.87 cdef
D4 6.20 ab 3.84 b 61.92 ef
D5 6.35 a 3.89 b 61.15 f
2019 CK 5.33 c 3.79 a 71.00 a
迟播迟栽
Late sowing
N0 D3 3.77 g 2.41 h 64.12 cd
D4 4.13 f 2.65 g 64.36 bcd
D5 4.50 e 2.87 f 63.63 cd
N240 D3 4.69 e 3.09 e 65.92 b
D4 5.00 d 3.24 de 64.64 bc
D5 5.26 cd 3.38 cd 64.23 bcd
N300 D3 5.27 cd 3.38 cd 64.00 cd
D4 5.56 bc 3.55 bc 63.84 cd
D5 5.95 a 3.73 ab 62.76 de
N360 D3 5.56 bc 3.53 bc 63.38 cd
D4 5.82 ab 3.68 ab 63.29 cde
D5 6.05 a 3.73 ab 61.60 e

表6

不同处理对迟播迟栽粳稻叶面积指数的影响"

年份
Year
处理
Treatment
拔节期
Jointing
抽穗期
Heading
成熟期
Maturity
抽穗期高效叶占比
High-efficiency leaf ratio at heading stage (%)
2018 CK 4.33 a 8.18 a 4.26 a 70.13 a
迟播迟栽
Late sowing
N0 D3 3.23 h 6.01 g 2.60 f 66.55 cde
D4 3.41 g 6.10 g 2.68 f 67.95 bcd
D5 3.57 f 6.39 f 2.97 e 68.27 bc
N240 D3 4.03 e 7.00 e 3.50 d 62.71 f
D4 4.08 de 7.22 d 3.64 cd 64.76 e
D5 4.13 cde 7.37 d 3.75 c 65.30 e
N300 D3 4.16 bcde 7.69 c 3.98 b 65.19 e
D4 4.19 bcd 7.82 bc 4.08 ab 66.12 de
D5 4.26 ab 7.99 ab 4.25 a 68.96 ab
N360 D3 4.24 abc 7.87 bc 4.12 ab 59.17 g
D4 4.27 ab 7.89 bc 4.14 ab 58.09 g
D5 4.36 a 7.94 b 4.16 ab 55.52 h
2019 CK 4.22 ab 7.73 a 3.71 a 70.79 a
迟播迟栽
Late sowing
N0 D3 3.04 h 5.27 f 1.77 e 66.45 abc
D4 3.13 h 5.36 f 1.85 e 67.98 ab
D5 3.32 g 5.45 f 1.93 e 69.22 ab
N240 D3 3.76 f 5.94 e 2.34 d 57.08 de
D4 3.80 ef 6.14 de 2.54 d 57.74 de
D5 3.97 de 6.39 d 2.72 cd 58.62 cde
N300 D3 4.02 cd 6.99 c 3.10 bc 60.69 bcde
D4 4.11 abcd 7.27 bc 3.41 ab 63.04 abcd
D5 4.15 abcd 7.48 ab 3.62 a 66.32 abc
N360 D3 4.06 bcd 7.24 bc 3.31 ab 56.50 de
D4 4.19 abc 7.27 bc 3.45 ab 55.69 de
D5 4.27 a 7.36 abc 3.53 ab 53.47 e

表7

不同处理对迟播迟栽粳稻干物质量及阶段干物质积累量的影响"

年份
Year
处理
Treatment
拔节期
Jointing
(t hm-2)
抽穗期
Heading
(t hm-2)
成熟期
Maturity
(t hm-2)
阶段积累量Accumulation
播种-拔节期
Seeding- Jointing
(t hm-2)
占比
Ratio
(%)
拔节-抽穗期
Jointing- Heading
(t hm-2)
占比
Ratio
(%)
抽穗-成熟期
Heading- Maturity
(t hm-2)
占比
Ratio
(%)
2018 CK 4.95 a 14.42 a 23.39 a 4.95 a 21.19 9.46 a 40.44 8.98 a 38.37
迟播迟栽
Late sowing
N0 D3 2.47 i 8.80 i 15.12 g 2.47 i 16.30 6.34 e 41.92 6.32 j 41.77
D4 2.52 i 9.15 hi 15.59 g 2.52 i 16.80 6.53 e 41.89 6.44 ij 41.31
D5 2.69 hi 9.35 h 15.92 g 2.69 hi 16.91 6.66 e 41.82 6.57 i 41.27
N240 D3 2.92 ghi 10.59 g 17.66 f 2.92 ghi 16.54 7.67 d 43.40 7.08 h 40.06
D4 3.07 gh 10.93 g 18.22 f 3.07 gh 16.84 7.87 d 43.14 7.30 g 40.02
D5 3.23 fg 11.44 f 19.06 e 3.23 fg 16.91 8.22 cd 43.11 7.62 f 39.98
N300 D3 3.38 efg 12.02 e 19.66 e 3.38 efg 17.17 8.65 bc 43.99 7.64 f 38.84
D4 3.63 ef 12.65 d 20.67 d 3.63 ef 17.56 9.02 ab 43.63 8.02 cd 38.81
D5 3.81 de 13.21 bc 21.57 bc 3.81 de 17.66 9.39 ab 43.54 8.37 b 38.80
N360 D3 4.15 cd 12.89 cd 20.76 cd 4.15 cd 20.01 8.73 abc 42.08 7.87 de 37.91
D4 4.46 bc 13.55 b 21.62 b 4.46 bc 20.62 9.10 ab 42.05 8.07 c 37.33
D5 4.66 ab 13.64 b 21.41 bcd 4.66 ab 21.75 8.99 ab 41.97 7.77 ef 36.29
2019 CK 4.35 a 13.13 a 21.87 a 4.35 a 19.90 8.78 a 40.13 8.75 a 39.97
迟播迟栽
Late sowing
N0 D3 2.09 k 8.08 j 13.83 j 2.09 k 15.14 5.99 h 43.34 5.74 i 41.52
D4 2.22 j 8.43 i 14.39 i 2.22 j 15.43 6.20 g 43.12 5.97 h 41.45
D5 2.36 i 8.72 h 14.75 i 2.36 i 15.97 6.36 g 43.10 6.04 h 40.93
N240 D3 2.53 h 9.49 g 16.28 h 2.53 h 15.53 6.97 f 42.80 6.79 g 41.67
D4 2.73 g 9.93 f 17.01 g 2.73 g 16.01 7.21 e 42.36 7.08 f 41.63
D5 2.89 f 10.44 e 17.85 f 2.89 f 16.18 7.55 d 42.30 7.41 e 41.51
N300 D3 3.15 e 11.15 d 18.50 e 3.15 e 17.03 8.00 c 43.26 7.35 e 39.71
D4 3.36 d 11.88 c 19.66 c 3.36 d 17.09 8.52 b 43.33 7.79 c 39.58
D5 3.59 c 12.17 c 20.09 b 3.59 c 17.85 8.59 b 42.74 7.92 b 39.42
N360 D3 3.50 c 11.95 c 19.24 d 3.50 c 18.22 8.44 b 43.87 7.30 e 37.90
D4 4.01 b 12.52 b 20.18 b 4.01 b 19.87 8.51 b 42.17 7.66 d 37.96
D5 4.34 a 12.86 a 19.91 bc 4.34 a 21.79 8.52 b 42.80 7.05 f 35.41

表8

不同处理对迟播迟栽粳稻氮肥利用率的影响"

年份
Year
处理
Treatment
吸收利用
Recovery efficiency (%)
农学利用率
Agronomic efficiency (kg kg-1)
生理利用率
Physiological efficiency (kg kg-1)
偏生产力
Partial factor productivity (kg kg-1)
2018 CK 43.64 ab 11.95 a 28.52 a 38.24 c
迟播迟栽
Late sowing
N0 D3 47.24 b
D4 47.55 b
D5 49.21 a
N240 D3 39.19 fg 7.45 h 19.00 g 36.34 e
D4 40.65 def 7.97 g 19.59 f 36.71 e
D5 42.49 bc 8.92 f 20.99 e 38.04 cd
N300 D3 39.90 ef 9.48 de 23.77 d 36.80 e
D4 42.21 bcd 10.72 c 25.40 b 37.56 d
D5 44.61 a 11.25 b 25.21 b 38.12 cd
N360 D3 37.66 g 9.17 ef 24.34 c 36.35 e
D4 39.67 ef 9.67 d 24.37 c 36.40 e
D5 41.19 cde 8.20 g 19.92 f 34.92 f
2019 CK 41.10 a 10.10 a 26.33 a 38.55 g
迟播迟栽
Late sowing
N0 D3 55.06 a
D4 54.81 a
D5 52.38 b
N240 D3 36.86 de 6.59 f 17.88 h 39.62 cde
D4 37.85 cd 6.89 ef 18.21 h 39.84 cd
D5 39.62 abc 7.85 d 19.81 f 39.28 def
N300 D3 38.01 bcd 9.13 b 24.01 c 40.22 c
D4 39.72 ab 9.38 b 23.61 cd 39.96 cd
D5 40.38 a 9.89 a 24.50 b 39.51 cde
N360 D3 35.63 e 8.37 c 23.49 de 39.04 efg
D4 37.27 de 8.58 c 23.01 e 38.73 fg
D5 38.27 bcd 7.18 e 18.76 g 35.79 h

图2

不同处理对迟播迟栽粳稻成熟期植株吸氮量及占总吸氮量比例的影响 处理同表4。表中数据为平均值(n = 3), 不同小写字母表示不同处理在P < 0.05水平上差异显著。"

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