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CALIBRATING CHLOROPHYLL METER (SPAD-502) READING BY SPECIFIC LEAF AREA FOR ESTIMATING LEAF NITROGEN CONCENTRATION IN SWEET SORGHUM

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Title CALIBRATING CHLOROPHYLL METER (SPAD-502) READING BY SPECIFIC LEAF AREA FOR ESTIMATING LEAF NITROGEN CONCENTRATION IN SWEET SORGHUM
 
Creator Uchino, Hiroshi
 
Contributor Watanabe, Takeshi
Ramu, Karri
Sahrawat, Kanwar Lal
Marimuthu, Subramanian
Wani, Suhas
Ito, Osamu
 
Subject chlorophyll meter
leaf nitrogen concentration
specific leaf area
 
Description The chlorophyll meter (SPAD-502) is used to estimate nitrogen status of various crops. However,
the relationship between SPAD readings and leaf nitrogen concentration (LNC) in sweet sorghum
(Sorghum bicolor) has not been fully established. We examined the relationship between SPAD
readings and LNC in sweet sorghum in a two-year study; and the effects of leaf thickness on the
relationship was also examined. There was a significant relationship between the SPAD reading
and LNC at each of two growth stages, but the correlation was weaker when the data for the two
growth stages were pooled. This correlation improved when the specific leaf area was introduced as
a second independent variable in the multiple regression analysis. This regression equation was
applicable to not only different growth stages but also different seasons. The results suggest that the
regression equation developed in this study can help in optimizing nitrogen fertilization for sweet
sorghum production.
 
Date 2013-11-30
2017-01-05T19:40:59Z
2017-01-05T19:40:59Z
 
Type Journal Article
 
Identifier https://mel.cgiar.org/reporting/download/hash/onY4htUj
Hiroshi Uchino, Takeshi Watanabe, Karri Ramu, Kanwar Lal Sahrawat, Subramanian Marimuthu, Suhas Wani, Osamu Ito. (30/11/2013). CALIBRATING CHLOROPHYLL METER (SPAD-502) READING BY SPECIFIC LEAF AREA FOR ESTIMATING LEAF NITROGEN CONCENTRATION IN SWEET SORGHUM. Journal of Plant Nutrition, 36, pp. 1640-1646.
https://hdl.handle.net/20.500.11766/5218
Open access
 
Language en
 
Rights CC-BY-NC-4.0
 
Format PDF
 
Publisher Taylor & Francis (Routledge)
 
Source Journal of Plant Nutrition;36,(2013) Pagination 1640,1646