Abstract:
An experience in farm Ezăreni-Iasi organized in 2008-2011, on cambic chernozem soil, we studied the effect of
biostymulators concentration (BCO - 4 DMA, BCO - 2 K; BCO - 2 K + acetate Zn) in three concentrations applied (50
ppm, 25 ppm, 12.5 ppm) in three biophases (twinning, bellows, flowering) for winter wheat, variety Boema. Climatic
conditions were favorable for winter wheat in terms of temperature and rainfall, crop year 2010-2011 the most
favorable for wheat. Averaged over three years, comparing yields with version control treated with water, the highest
yield was achieved with biostymulators BCO-2 K + zinc acetate, with 6322 kg / ha, 26.16% difference is very
significant. Comparing yields with BCO - 4 DMA (control variant 2) production increase was 11.14%, distinct
significantly in the variant BCO - 2 K + zinc acetate. In the three years average the concentrations of 12.5 ppm and 25
ppm were found higher comparated with the concentrations of 50 ppm. Between biophases application of growth
regulators no registered statistically differences, which requires obtaining of similar production value. The interaction
between factors showed that the best variant BCO - 2 K x 25 ppm x flowering, with an average of 6844 kg / ha, 11.77%
higher than the production control variant (BCO - 4 DMA x 12.5 ppm x twinning). The biostymulators used were
potassium salt of the acid-4-chloro-phenoxyacetic amidosulfonil (BCO - 4 K), without and with zinc acetate and
dimethylamine salt of 4-chloro acid, 2-phenoxyacetic sulfonyl amide (BCO - 4 DMA) obtained of the Proff. C. Oniscu
from the Technical University "Gh. Asachi" of Iasi.
