Study of pesticide side-effects in winter wheat trials

Wide range of wheat varieties were investigated in field trials and greenhouse, to study the different side-effects of herbicides and fungicides. Side-effects of seed dressings were more characterized on the wheat varieties with a short vegetation period, than for those with a longer one, both in the intensity of germination, dry matter accumulation and yield production. The depressive side-effects of herbicides were also in a close connection with the genotypes. Spraying with triazole fungicides increased the yield and inhibited the senescence of flag leaf with a protracted chlorophyl retention

Comparison of Interpolation Methods: for Predicting the Vapour Pressure of Aqueous Glycerol Solutions

Several general mathematical methods for approximating two variable functions are applied for the study of the temperature - concentration - vapour pressure relation of aqueous glycerol solutions. The general prope rties of the applied methods are also discussed for possible other applications

COMPARISON OF 2-VARIABLE INTERPOLATION METHODS FOR PREDICTING THE VAPOUR PRESSURE OF AQUEOUS GLYCEROL SOLUTIONS

Several general mathematical methods for approximating two variable functions are applied for the study of the temperature - concentration - vapour pressure relation of aqueous glycerol solutions. The general properties of the applied methods are also discussed for possible other applications

Evidence of quasi-intramolecular redox reactions during thermal decomposition of ammonium hydroxodisulfitoferriate(III), (NH4)(2)[Fe(OH)(SO3)(2)]center dot H2O

Synthesis of ammonium hydroxodisulfitoferriate(III), (diammonium catena-{bis(mu (2)-sulfito-kappa O,kappa O)-mu (2)-hydroxo-kappa O-2}ferrate(III) monohydrate) (NH4)(2)[Fe(OH)(SO3)(2)]center dot H2O (compound 1) and its thermal behavior is reported. The compound is stable in air. Its thermal decomposition proceeds without the expected quasi-intramolecular oxidation of sulfite ion with ferric ions. The disproportionation reaction of the ammonium sulfite, formed from the evolved NH3, SO2 and H2O in the main decomposition stage of 1, results in the formation of ammonium sulfate and ammonium sulfide. The ammonium sulfide is unstable at the decomposition temperature of 1 (150 A degrees C) and transforms into NH3 and H2S which immediately forms elementary sulfur by reaction with SO2. The formation and decomposition of other intermediate compounds like (NH4)(2)SnOx (n = 2, x = 3 and n = 3, x = 6) results in the same decomposition products (S, SO2 and NH3). Two basic iron sulfates, formed in different ratios during synthesizing experiments performed under N-2 or in the presence of air, have been detected as solid intermediates which contain ammonium ions. The final decomposition product was proved to be alpha-Fe2O3 (mineral name hematite)