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Estimation of Nitrogen Content and Marketable Yield Using Chlorophyll Readings

Received: 10 September 2021     Accepted: 26 September 2021     Published: 12 October 2021
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Abstract

Accurate estimation of nitrogen content and yield is crucial and these can be predicted through chlorophyll readings as indicators. To explore the diagnosis model, a field experiment was conducted in a greenhouse at Yang ling, northwest China. The SPAD values results estimated the nitrogen status, total marketable yield, and rates of reduction in market yield. There was a positive correlation between SPAD value at the middle leaf (MD-SPAD) and nitrogen accumulation, and between SPAD value under the leaf (UD-SPAD) and nitrogen accumulation (R2=0.37-0.78, P<0.01, n=27). The MD-SPAD and UD-SPAD were positively correlated with total marketable yield during the growth period (R2=0.43-0.59, P<0.01, n=27). However, a poor correlation was observed at the upper leaf (UP-SPAD) in the expanding fruit period but was better in the mature period. Moreover, the nitrogen nutrition index (NNI) and MD-SPAD were positively correlated (R2=0.42-0.55, P<0.01, n=54). There SPAD values and reduction rates of ranks were positively correlated in marketable yield (R2=0.48-0.52, P<0.01, n=54), including middle fruit yield (MFY) and big fruit yield (BFY). This was similar between SPAD values and reduction rates of total marketable yield (R2=50, P<0.01, n=54). This indicated that nitrogen accumulation estimates including nitrogen accumulation in stem, leaf, fruit, and the overall nitrogen accumulation, as well as total marketable yield, is not accurate via UP-SPAD during fruit expanding period but it is opposite in mature period. When simultaneously considering estimation of nitrogen accumulation, NNI and marketable yield using chlorophyll readings, which were adopted by mean of SPAD values the different leaf positions or SPAD values at the middle leaf. On the other hand, UP-SPAD should be cautiously used to estimate nitrogen status, yield, and yield reduction rates. The overall marketable yield was optimal under W2 of 2488 m3hm-2 and N2 of 300 kghm-2. The reduction rates during middle fruit yield, big fruit yield, and total marketable yield ranged from 31%-38%. The big fruit yield was the highest, indicating that the big fruit yield is highly affected by severe water stress in the blossom and fruit period.

Published in International Journal of Applied Agricultural Sciences (Volume 7, Issue 5)
DOI 10.11648/j.ijaas.20210705.12
Page(s) 219-231
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This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2021. Published by Science Publishing Group

Keywords

Nitrogen Status, SPAD Value, Relationship, Leaf Position, Marketable Yield

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  • APA Style

    Xiaoyan Pan, Hongxia Cao, Jiankai Zhang, Zijian He, Bingjie Du. (2021). Estimation of Nitrogen Content and Marketable Yield Using Chlorophyll Readings. International Journal of Applied Agricultural Sciences, 7(5), 219-231. https://doi.org/10.11648/j.ijaas.20210705.12

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    ACS Style

    Xiaoyan Pan; Hongxia Cao; Jiankai Zhang; Zijian He; Bingjie Du. Estimation of Nitrogen Content and Marketable Yield Using Chlorophyll Readings. Int. J. Appl. Agric. Sci. 2021, 7(5), 219-231. doi: 10.11648/j.ijaas.20210705.12

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    AMA Style

    Xiaoyan Pan, Hongxia Cao, Jiankai Zhang, Zijian He, Bingjie Du. Estimation of Nitrogen Content and Marketable Yield Using Chlorophyll Readings. Int J Appl Agric Sci. 2021;7(5):219-231. doi: 10.11648/j.ijaas.20210705.12

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  • @article{10.11648/j.ijaas.20210705.12,
      author = {Xiaoyan Pan and Hongxia Cao and Jiankai Zhang and Zijian He and Bingjie Du},
      title = {Estimation of Nitrogen Content and Marketable Yield Using Chlorophyll Readings},
      journal = {International Journal of Applied Agricultural Sciences},
      volume = {7},
      number = {5},
      pages = {219-231},
      doi = {10.11648/j.ijaas.20210705.12},
      url = {https://doi.org/10.11648/j.ijaas.20210705.12},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijaas.20210705.12},
      abstract = {Accurate estimation of nitrogen content and yield is crucial and these can be predicted through chlorophyll readings as indicators. To explore the diagnosis model, a field experiment was conducted in a greenhouse at Yang ling, northwest China. The SPAD values results estimated the nitrogen status, total marketable yield, and rates of reduction in market yield. There was a positive correlation between SPAD value at the middle leaf (MD-SPAD) and nitrogen accumulation, and between SPAD value under the leaf (UD-SPAD) and nitrogen accumulation (R2=0.37-0.78, P2=0.43-0.59, P2=0.42-0.55, P2=0.48-0.52, P2=50, P3hm-2 and N2 of 300 kghm-2. The reduction rates during middle fruit yield, big fruit yield, and total marketable yield ranged from 31%-38%. The big fruit yield was the highest, indicating that the big fruit yield is highly affected by severe water stress in the blossom and fruit period.},
     year = {2021}
    }
    

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  • TY  - JOUR
    T1  - Estimation of Nitrogen Content and Marketable Yield Using Chlorophyll Readings
    AU  - Xiaoyan Pan
    AU  - Hongxia Cao
    AU  - Jiankai Zhang
    AU  - Zijian He
    AU  - Bingjie Du
    Y1  - 2021/10/12
    PY  - 2021
    N1  - https://doi.org/10.11648/j.ijaas.20210705.12
    DO  - 10.11648/j.ijaas.20210705.12
    T2  - International Journal of Applied Agricultural Sciences
    JF  - International Journal of Applied Agricultural Sciences
    JO  - International Journal of Applied Agricultural Sciences
    SP  - 219
    EP  - 231
    PB  - Science Publishing Group
    SN  - 2469-7885
    UR  - https://doi.org/10.11648/j.ijaas.20210705.12
    AB  - Accurate estimation of nitrogen content and yield is crucial and these can be predicted through chlorophyll readings as indicators. To explore the diagnosis model, a field experiment was conducted in a greenhouse at Yang ling, northwest China. The SPAD values results estimated the nitrogen status, total marketable yield, and rates of reduction in market yield. There was a positive correlation between SPAD value at the middle leaf (MD-SPAD) and nitrogen accumulation, and between SPAD value under the leaf (UD-SPAD) and nitrogen accumulation (R2=0.37-0.78, P2=0.43-0.59, P2=0.42-0.55, P2=0.48-0.52, P2=50, P3hm-2 and N2 of 300 kghm-2. The reduction rates during middle fruit yield, big fruit yield, and total marketable yield ranged from 31%-38%. The big fruit yield was the highest, indicating that the big fruit yield is highly affected by severe water stress in the blossom and fruit period.
    VL  - 7
    IS  - 5
    ER  - 

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Author Information
  • Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest Agriculture & Forestry University, Yangling, China

  • Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest Agriculture & Forestry University, Yangling, China

  • Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest Agriculture & Forestry University, Yangling, China

  • Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest Agriculture & Forestry University, Yangling, China

  • Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest Agriculture & Forestry University, Yangling, China

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