Using data of optic sensors and pigment content in leaves for efficient diagnostics of nitrogen nutrition
Laen...
Kuupäev
2022
Kättesaadav alates
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Estonian University of Life Sciences
Abstrakt
Opportune monitoring and diagnostics of a condition of crops permit to make prompt and
proper activities on dressing nitrogen fertilizers. This will allow the plants to use the nitrogen applied
efficiently, and therefore reduce their use in field. Since nitrogen that has not been utilized by plants
is able to escape into the atmosphere or be washed out of the soil with water. The most accurate
diagnostic method is to determine the chemical composition of plants, but it takes quite a long time
and requires laboratory conditions, which is not always possible in the field. One of the promising
methods is photometric diagnostics of crops using optical instruments. Experiment is carried out in
contrasting weather conditions, on soddy-podzolic soil with spring barley and spring rapeseed being
investigated. Results of research show the efficiency of using optic sensors (N-testers) for efficient
diagnostics of nitrogen nutrition of plants. The readings of the device (N-tester) were compared with
the concentration of a and b chlorophyll, determined by a chemical method. Results of diagnostics
with portable photometric device ‘Yara’ are correlating with concentrations of chlorophylls a
(r=0.96) and b (r = 0.91) in spring rapeseed. Moreover, correlation of rapeseed yield and
concentrations of chlorophylls a and b has quantity and inverse relation similar to device indication
(r = -0.81 and r = -0.70 respectively). Results of diagnostics with N-tester ‘Spectroluxe’ are
strongly correlating with chlorophyll concentration. Device indication correlates stronger with
chlorophyll b concentration in spring barley and chlorophyll a concentration in spring rapeseed
(rapeseed was investigated in dryer conditions). Thus, such a modern optical device as N-tester,
whose action is based on measuring the concentration of leafy chlorophyll, can replace chemical
methods and increase the efficiency of nitrogen fertilization, which means increasing the
productivity of plants and reducing the negative impact of unreasonable use of nitrogen fertilizers.
Kirjeldus
Received: February 23rd, 2022 ; Accepted: May 16th, 2022 ; Published: August 12th, 2022 ; Correspondence: oashuklina@gmail.com
Märksõnad
chlorophyll fluorescence, fertilizers, optical sensors, nitrogen status, ammonium nitrate, spring barley, spring rape, plant diagnostics, articles