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Specific and non-specific changes in optical characteristics of spring wheat leaves under nitrogen and water deficiency

Published online by Cambridge University Press:  01 June 2017

V. Yakushev ,
E. Kanash ,
D. Rusakov  and
S. Blokhina
V. Yakushev*
Affiliation:
Agrophysical Research Institute, Grazhdansky prosp. 14, St. Petersburg, 195220, Russian Federation
E. Kanash
Affiliation:
Agrophysical Research Institute, Grazhdansky prosp. 14, St. Petersburg, 195220, Russian Federation
D. Rusakov
Affiliation:
Agrophysical Research Institute, Grazhdansky prosp. 14, St. Petersburg, 195220, Russian Federation
S. Blokhina
Affiliation:
Agrophysical Research Institute, Grazhdansky prosp. 14, St. Petersburg, 195220, Russian Federation
*
†E-mail: ykanash@yandex.ru
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Abstract

The research concerns the changes of spectral characteristics of reflected radiation (360 to 1 000 nm) of spring wheat leaves under nitrogen deficiency and moderate soil drought. The efficiency of factorial influence (η2) on chlorophyll index was equal to 20% and 4% under nitrogen and water deficiency, respectively. Most significantly soil drought influenced the water index WRI (η2=55%) and the light diffusion index R800 (η2=28%), which was caused by changes in leaf structure. At low levels of nitrogen supply, these parameters did not change or changed only slightly (η2=2%). It may be deduced that the data base for crop monitoring in precision farming systems must contain a series of optical criteria for assessing specific and non-specific changes in optical characteristics of a crop canopy under the impact of various stress factors.

Keywords

wheatreflectance indexesnitrogen and water deficiency
Type
Crop Sensors and Sensing
Information
Advances in Animal Biosciences , Volume 8 , Special Issue 2: Papers presented at the 11th European Conference on Precision Agriculture (ECPA 2017), John McIntyre Centre, Edinburgh, UK, July 16–20 2017 , July 2017 , pp. 229 - 232
Copyright
© The Animal Consortium 2017 

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