eprintid: 6907
rev_number: 17
eprint_status: archive
userid: 128
dir: disk0/00/00/69/07
datestamp: 2013-07-02 03:34:59
lastmod: 2016-10-19 05:51:23
status_changed: 2013-07-02 03:34:59
type: article
metadata_visibility: show
contact_email: Library-ICRISAT@CGIAR.ORG
creators_name: Uchino, H
creators_name: Watanabe, T
creators_name: Ramu, Karri
creators_name: Sahrawat, K L
creators_name: Marimuthu, S
creators_name: Wani, S P
creators_name: Ito, O
icrisatcreators_name: Uchino, H
icrisatcreators_name: Watanabe, T
icrisatcreators_name: Ramu, K
icrisatcreators_name: Sahrawat, K L
icrisatcreators_name: Wani, S P
affiliation: ICRISAT(Patancheru)
affiliation: JIRCAS(Tsukuba)
country: India
country: Japan
title: Calibrating Chlorophyll Meter (Spad-502) Reading by Specific Leaf Area for Estimating Leaf Nitrogen Concentration in Sweet Sorghum
ispublished: pub
subjects: s1.4
full_text_status: restricted
keywords: chlorophyll meter, leaf nitrogen concentration, specific leaf area, sweet
sorghum [Sorghum bicolor (L.) Moench]
note: We thank Mr. K. Papa Rao, Mr. P. V. Satish and Mr. M. Vishwanath, of ICRISAT and Mr.T. Naya of Crop Science Laboratory, Hokkaido University,
for their dedicated support. This study was a part of a research project “Development of sustainable soil fertility management for sorghum and sweet sorghum through effective use of biological nitrification inhibition (BNI)” and was funded by grants from the Ministry of Agriculture, Forestry and Fisheries, Japan
abstract: 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
date_type: published
publication: Journal of Plant Nutrition
volume: 36
number: 10
publisher: Taylor & Francis
pagerange: 1640-1646
id_number: 10.1080/01904167.2013.799190
refereed: TRUE
issn: 0190-4167
official_url: http://dx.doi.org/10.1080/01904167.2013.799190
related_url_url: http://scholar.google.co.in/scholar?as_q=%22Calibrating+Chlorophyll+Meter+%28Spad-502%29+Reading+by+Specific+Leaf+Area+for+Estimating+Leaf+Nitrogen+Concentration+in+Sweet+Sorghum%22&as_epq=&as_oq=&as_eq=&as_occt=title&as_sauthors=&as_publication=&as_ylo=&
related_url_type: pub
funders: Ministry of Agriculture, Forestry and Fisheries, Japan
projects: Development of sustainable soil fertility management for sorghum and sweet sorghum through effective use of biological nitrification inhibition (BNI)
citation:   Uchino, H and Watanabe, T and Ramu, Karri and Sahrawat, K L and Marimuthu, S and Wani, S P and Ito, O  (2013) Calibrating Chlorophyll Meter (Spad-502) Reading by Specific Leaf Area for Estimating Leaf Nitrogen Concentration in Sweet Sorghum.  Journal of Plant Nutrition, 36 (10).  pp. 1640-1646.  ISSN 0190-4167     
document_url: http://oar.icrisat.org/6907/7/jpn_2013.pdf
document_url: http://oar.icrisat.org/6907/1/J-PLANT-NUTR_36_1640-46_2013.pdf