At the end of XX century a new generation of miniaturized portable equipment for measuremend of gas exchange, absorption of phytosyn- thetically active radiation (PAR), spectral composition of solar irradiation and for leaf area index in plant canopy was developed. In this work there are presented of above mentioned equipment for measurement of: - parameters of gas exchange in the canopy; - plant morphology and canopy structure; - balance of phytosynthetically active radiation and spectral composition of the light in the canopy. Results of these measurements will allow for better use of agriculturai technics and cultivars to create spatial structure of a canopy and better use of atmospheric CO₂ and solar irradiation in forming of economical yield. Additionally they can be a base for building of simulations models of plant growth and development under changing environmental conditions.
The aim of a pot experiment was to study the effect nitrogen fertilization applied under different levels of PAR (Photosynthetically Active Radiation) on aphids’ occurrence in spring barley. The following experiment factors were taken into consideration: three spring barley cultivars (Maresi, Poldek and Rasbet), three levels of PAR (1 – full, 0.5 and 0.25) and three nitrogen doses (0.5, 1.0 and 1.5 g N/pot). The result of presented study showed that with increasing levels of fertilization and PAR the number and percentage of barley plants infested by aphids significantly increased.
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