Indicators for diagnosing nitrogen status of rice based on chlorophyll meter readings
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- 作者：Zhaofeng Yuan ; Syed Tahir Ata-Ul-Karim ; Qiang Cao ; Zhenzhou Lu ; Weixing Cao ; Yan Zhu ; Xiaojun Liu ; liuxj@njau.edu.cn" class="auth_mail" title="E-mail the corresponding author
- 关键词：BT ; booting ; DAS ; days after sowing (days) ; DAT ; days after transplanting (days) ; DM ; dry matter (kg ; ha&minus ; 1) ; DSI ; difference SPAD index ; H-43 ; Hang43 ; HD ; heading ; L1 ; SPAD reading of the first fully expanded leaf from top ; L2 ; SPAD reading of the second fully expanded leaf from top ; L3 ; SPAD reading of the third fully expanded leaf from top ; L4 ; SPAD reading of the fourth fully expanded leaf from top ; LDM ; leaf dry matter (kg ; ha&minus ; 1) ; LFT1 ; first fully expanded leaf from top
- 刊名：Field Crops Research
- 出版年：2016
- 出版时间：January 2016
- 年：2016
- 卷：185
- 期：Complete
- 页码：12-20
- 全文大小：1459 K
文摘
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We examined the correlation among 12 SPAD and 4 nitrogen (N) indicators in rice.
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Normalized SPAD index of the fourth fully expanded leaf from top (NSI4) was selected to develop the single-stage and duration models from stem elongation to booting stages.
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Two stable & general duration diagnostic models were developed between plant N accumulation (NA), N nutrition index (NNI) and NSI4.
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The calibration showed the models can be used as suitable N diagnostic tools.