The aim of the research was to check the suitability
of the Phytotoxkit test for quick assessment of usefulness of
ashes from the combustion of sorghum and Jerusalem artichoke
biomass as fertilizers in the cultivation of energy crops. Seeds of
Sorghum bicolor L. were placed in the Phytotoxkit-plates, filled
with Alonet Substrate KS (Latvia) and containing 0-100% of ash
from burnt sorghum and Jerusalem artichoke plants. Based on
daily measurements under greenhouse conditions, dynamics of
seed germination, growth speed of shoots and roots, their fresh
and dry biomass, index of chlorophyll content and parameters of
gas exchange were evaluated. The results indicated that the modified
Phytotoxkit biotest could be useful for quick assessment of
ashes usefulness as fertilizers, it can be performed under greenhouse
conditions regardless of the growing season and may be an
alternative to laborious and long-term field trials. Biotest showed
that the studied ashes, used in the proper dosages, improved seed
germination, plant growth and biomass yield. These events were
associated with increased index of chlorophyll content in leaves,
net photosynthesis, stomatal conductivity, transpiration and proportionally
decreased concentration of intercellular CO2. This
indicate, that the studied ashes can be used as fertilizers in sorghum
crops.
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