Relationship between chlorophyll meter readings and nitrogen in poinsettia leaves. (21st July 2018)

• Record Type: Journal Article
• Authors: Dunn, Bruce L.; Singh, Hardeep; Goad, Carla
• Is Part Of: Journal of plant nutrition. Volume 41:Number 12(2018)
• Page Start: 1566
• Page End: 1575
• Publication Date: 2018-07-21
• Subjects: greenhouse -- nutrient status -- sensor; Plants -- Nutrition -- Periodicals; Plants -- Effect of minerals on -- Periodicals; Deficiency diseases in plants -- Periodicals; 575.76
• DOI: 10.1080/01904167.2018.1459697
• Languages: English
• ISSNs: 0190-4167

Abstract

ABSTRACT: Chlorophyll meters are used for non-destructive estimation of leaf nitrogen (N). The objective of this study was to evaluate the readings with several chlorophyll meters (SPAD-502, atLEAF, and CCM-300), different sampling sites on leaves, number of leaves used for sampling, and different types of leaf N sampling on estimation of N in leaves of potted poinsettia ( Euphorbia pulcherrima ) "Prestige Red." Results showed that all meters gave readings that were correlated for N determination and also were correlated with each other. SPAD and atLEAF showed interaction between different N treatments and different sampling sites on the leaves, while CCM readings were affected by different sampling sites on the leaf. atLEAF readings showed interaction between number of leaves sampled and different N treatments. Thus, during sensor-based leaf N estimation, sampling site on leaf, number of leaves sampled, and stage of plant development should be considered to minimize error.