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Preliminary assessment of a rapid leaf nitrogen test in mango

Still, L. A. and Bally, I. S. E. (2013) Preliminary assessment of a rapid leaf nitrogen test in mango. Acta Hort, 975 . pp. 385-392. ISSN 05677572 (ISSN)

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Article Link(s): http://www.actahort.org/books/975/975_49.htm

Abstract

Nitrogen (N) is an essential nutrient in mango, influencing both productivity and fruit quality. In Australia, tree N is traditionally assessed once a year in the dormant pre-flowering stage by laboratory analysis of leaf N. This single assessment is insufficient to determine tree N status at all stages of the annual phenological cycle. Development of a field-based rapid N test would allow more frequent monitoring of tree N status and improved fertiliser management. This experiment examined the accuracy and useability of several devices used in other horticultural crops to rapidly assess mango leaf N in the field; the Konica Minolta 'SPAD-502 chlorophyll meter', Horiba 'Cardy Meter' and the Merck 'RQflex 10'. Regression and correlation analyses were used to determine the relationship between total leaf N and the measurements from the rapid test devices. The relationship between the chlorophyll index measured by the SPAD-502 meter and leaf N is highly significant at late fruit set (R 2=0.72, n=40) and post-harvest (R2=0.81, n=40) stages in the mango cultivar 'Kensington Pride' and significant (R2=0.51, n=40) at the flowering stage, indicating the device can be used to rapidly assess mango leaf N in the field. Correlation analysis indicated the relationship between petiole sap measured with the Cardy or Merck devices and leaf N is non-significant. © 2013 ISHS.

Item Type:Article
Business groups:Crop and Food Science
Keywords:'Kensington Pride' Cardy nitrate meter Chlorophyll Mango Merck RQflex10 nitrate meter Nitrogen Rapid test SPAD-502 meter
Subjects:Plant culture > Fruit and fruit culture
Agriculture > Agriculture (General) > Fertilisers
Deposited On:17 Jul 2014 00:42
Last Modified:17 Jul 2014 00:42

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