NDLI: Chlorophyll Meter for the Evaluation of Potato N Status

Content Provider	Springer Nature Link
Author	Giletto, Claudia M. Echeverría, Hernán E.
Copyright Year	2013
Abstract	Here, we propose a new approach to determine the level of plant N nutrition, based on the relationship between chlorophyll meter (CM) readings and total biomass in potato plants. The objectives of this work were i) to determine the critical curve CM (CM$_{c}$) readings; ii) to establish the relationship between N nutrition index of CM (NNI$_{CM}$), and relative tuber yields (RY), and iii) to establish the crop N required (NR). The experiments were carried out during four growing seasons. The cultivar Innovator was planted in a randomized complete block design with three replications and four N treatments (N0, N1, N2 y N3) to cover the range from deficient through surplus N. The CM reading was assessed with the Minolta SPAD 502 at different times during each growing season. The NNI$_{CM}$ was determined as the ratio between the actual CM reading (CMa) and the CMc. The NR was determined as the difference between actual N uptake and the critical N uptake, divided the N utilization efficiency. The CMc for cultivar innovator was determined [CMc = 51.4 W (Mg ha$^{_1}$)$^{−0.13}$; R$^{2}$ = 0.83]. The NNI$_{CM}$ ranged from 0.78 to 1.17. The relation between RY and NNI$_{CM}$ was expressed as a linear-plateau function. For NNI$_{CM}$ ≥0.9, the RY was near 98.0 %, whereas for NNI$_{CM}$ below 0.9, the RY decreased [RY = 7.73 + 100.0 NNI$_{CM}$; R$^{2}$ = 0.55]. The relationship between the observed N uptake and the estimated N uptake values showed positive significant associations (p < 0.0001). We conclude that the CM reading can be used as an easy and fast tool to predict NR in potato plants under field conditions during the vegetative growth period.Este trabajo presenta un nuevo enfoque para determinar el estatus de N en papa, en la que se propone utilizar la relación entre el índice verde (IV) y la biomasa total. Los objetivos de este trabajo fueron: i) determinar el índice verde crítico (IVc); ii) establecer la relación entre el índice de nutrición de nitrógeno (INNIV) y el rendimiento relativo de los tubérculos (RR); iii) establecer el N requerido por el cultivo (RN). Los experimentos se llevaron a cabo durante cuatro temporadas. Se utilizó el cultivar Innovador plantado en un diseño en bloques completo y aleatorizado con tres repeticiones y cuatro tratamientos N. El IV se determinó con el Minolta SPAD 502 en diferentes momentos durante cada temporada de crecimiento. Se determinó el IVc [IVc = 51,4 W (Mg ha$^{−1}$)$^{−0.13}$; R$^{2}$ = 0,83]. El INN$_{IV}$ varió entre 0,78 a 1,17. La relación entre el RR y el INN$_{IV}$ fue expresada por una función lineal-plateau. Para un INN$_{IV}$ ≥0,9 el RR fue alrededor del 98,0 %. Con INN$_{IV}$ menores a 0,9, el RR disminuye [RR = 7,73 + 100,0 INN$_{IV}$; R2 = 0,55]. La relación entre la cantidad de N en planta estimada y la observada mostró una estrecha asociación lineal (p < 0,0001). Se concluye que el IV puede ser utilizado como una herramienta fácil y rápida para predecir RN en plantas de papa bajo condiciones de campo durante el periodo de crecimiento vegetativo.
Starting Page	313
Ending Page	323
Page Count	11
File Format	PDF
ISSN	1099209X
Journal	American Potato Journal
Volume Number	90
Issue Number	4
e-ISSN	18749380
Language	English
Publisher	Springer New York
Publisher Date	2013-06-06
Publisher Institution	Potato Association of America
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Dilution curve of the critical chlorophyll meter readings Processing potato N required Plant Sciences Agriculture Plant Genetics & Genomics Plant Breeding/Biotechnology Plant Pathology
Content Type	Text
Resource Type	Article
Subject	Plant Science Agronomy and Crop Science

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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