Spectral composition of the applied radiation as a factor affecting the development, habit and yield of spring barley
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Department of Agrometeorology and Applied Informatics, Institute of Soil Science and Plant Cultivation – State Research Institute, Czartoryskich 8, 24-100 Puławy, Poland
Department of Plant Nutrition and Fertilization, Institute of Soil Science and Plant Cultivation – State Research Institute, Czartoryskich 8, 24-100 Puławy, Poland
Department of Plant Breeding and Biotechnology, Institute of Soil Science and Plant Cultivation – State Research Institute, Krańcowa 8, 24-100 Puławy, Poland
Final revision date: 2023-06-02
Acceptance date: 2023-06-06
Publication date: 2023-09-14
Corresponding author
Anna Podleśna   

Plant Nutrition and Fertilization, IUNG-PIB Puławy, Czartoryskich 8, 24-100, Puławy, Poland
Int. Agrophys. 2023, 37(3): 293-310
  • The habit of barley was dependent on spectral composition of radiation in the growth chambers.
  • Plants growing in the chambers with the lowest R/FR ratio produced the longest shoots
  • Together with decreasing R/FR ratio the length of internodes was increasing.
  • The most grains were produced by plants growing in low R/FR ratio, and the least – in conditions with the highest R/FR ratio.
The aim of the conducted experiments was to determine the impact of the differentiated composition of spectral radiation on the development of spring barley. The experiment was conducted in laboratory conditions using artificial sources of radiation. The habit of the barley was dependent on the spectral composition of the radiation in the growth chambers in which the red to far-red values were in the range of 0.92-10.0. Barley grown with an increased share of far red light produced decidedly longer internodes and taller shoots than the plants radiated with a smaller amount. The leaves of the barley grown in a high red to far-red ratio were positioned less vertically and the plants formed a more dense canopy than in the chambers with a lower red to far-red ratio. The plants grown in the chamber with a low red to far-red ratio produced a greater mass of stems with ears and a lower mass of infertile stems in comparison with the plants grown in radiation with a lower share of far-red. In summary, in these condition it was found that an increase in the number and mass of grains, in the grain weight to stem weight ratio, in the total mass of straw and plants as well as in an increase in the 1 000 grain weight. A low red to far-red ratio is an indicator of the existence of competition but observed differences in barley development and yield showed that in these conditions the plants demonstrated adaptive responses to shading.
The authors declare no conflict of interest.
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