Articles
MEASUREMENT OF FRUIT TREE TOTAL LEAF NITROGEN BY NEAR-INFRARED REFLECTANCE SPECTROSCOPY
Article number
274_28
Pages
241 – 248
Language
Abstract
Near infrared reflectance (NIR) techniques offer a rapid, nondestructive, nonchemical method of analysis for predicting leaf tissue total N content.
Prior work had demonstrated that NIR was a suitable technique for estimating apple leaf tissue N content.
In order to make the technique more versatile, a study was conducted using leaf samples obtained from 4 fruit tree species grown in the field.
The trees used were: ‘Gala’ apple (Malus domestica Borkh.) budded on M.26 (dwarfing) or MM.lll (semi-standard) rootstocks, ‘Redskin’ peach (Prunus persica L.) on Lovell rootstock, ‘Stanley’ plum (Pyrus domestica L.) on Myrobalon rootstock, and ‘Seckel’ pear (Pyrus communis L.) on seedling rootstock.
Monthly leaf samples (from May to August) were taken and prepared by standard methods.
Calibration sets composed of one species were the best predictors for that species with SEP (standard.error of prediction) values of 0.15 or less.
A calibration set containing all leaf types predicted peach (SEP 0.18), and apple (SEP 0.15), pear (SEP = 0.36), and plum (SEP = 0.46) leaf total N from samples obtained the following years.
The method developed is suitable for peach and apple leaf estimation.
Increasing the size of the calibration set overtime may increase the usefulness of the method for plum and pear tissue analysis.
Prior work had demonstrated that NIR was a suitable technique for estimating apple leaf tissue N content.
In order to make the technique more versatile, a study was conducted using leaf samples obtained from 4 fruit tree species grown in the field.
The trees used were: ‘Gala’ apple (Malus domestica Borkh.) budded on M.26 (dwarfing) or MM.lll (semi-standard) rootstocks, ‘Redskin’ peach (Prunus persica L.) on Lovell rootstock, ‘Stanley’ plum (Pyrus domestica L.) on Myrobalon rootstock, and ‘Seckel’ pear (Pyrus communis L.) on seedling rootstock.
Monthly leaf samples (from May to August) were taken and prepared by standard methods.
Calibration sets composed of one species were the best predictors for that species with SEP (standard.error of prediction) values of 0.15 or less.
A calibration set containing all leaf types predicted peach (SEP 0.18), and apple (SEP 0.15), pear (SEP = 0.36), and plum (SEP = 0.46) leaf total N from samples obtained the following years.
The method developed is suitable for peach and apple leaf estimation.
Increasing the size of the calibration set overtime may increase the usefulness of the method for plum and pear tissue analysis.
Authors
R.F. Korcak, V. Walker, K.H. Norris
Keywords
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