EFFECT OF A BIOREGULATOR (WITH ETHEPHON ACTIVE AGENT) ON THE GRAIN-YIELD AND BAKERY QUALITY OF WINTER-WHEAT

The effects of Flordimex regulator with chloroethylphosphonic acid (ethephon) active agent were studied on yield formation, connected with nutrient supply, in a 3-year trial. The varieties GK. Szeged and Jubilejnaja 50 were included in the trial besides the natural nutrient supply of soil (I), and besides the application of nitrogen active agent of 180 kg/ha (II) and of 240 kg/ha (III). The ethephon (E = Flordimex 1,2 1/ha) was, sprayed alone and in combination of triadimefon-fungicide (TR = Bayleton 0,5 kg/ha) in two phenological stages: following shooting (I-J) and preceding earing (L-M). Applying at the same two stages 100 + 70 + 70 kg/ha NPK active agent, the specific yield reaction of the different varieties were tested (1984-89). In the field trials no interaction was found between N-fertilization and the application of bioregulator with ethephon active agent. The regulator had hardly in influence on the productivity on the average of years (Tables 1, 2.), but had a favourable effect on the bakery quality of the varieties (Tables 3, 4.). The later application of the regulator (preceding earing) firstly increased the gluten content and the valorigraphic number of value. In the comparative trials the early application of ethephon stimulated the productivity only of one variety (Bucsanyi 20), and deteriorated it at the same time of three ones (Beauchamp, Impuls, GK. Szoke), while the other ones were not affected. On the effect of spraying before earing a significant positive reaction was shown by varieties GK. Sarvari, Bucsanyi 20, GK. Bence, and by two durum varieties (GK. Basa, GK. Minaret). Also the later application caused by varieties Beauchamp and GK. Szoke a reliable yield-depression (Table 5.).