Effect of reduced retardant doses on winter wheat's yielding

摘要

Field experiments were carried out in Poland with winter wheat cv. Muza on a grey-brown podzolic soil made of loess (good wheat complex), involving a control (without growth retardant) and treatments with growth retardants Antywylegacz Plynny 725 SL (chlormequat chloride), Moddus 250 EC (trinexapac-ethyl) and Cecefon 465 SL (chlorocholine chloride [chlormequat]+ethephon) used in recommended as well as reduced (50 and 67%) rates. The growth regulators were applied by means of a field crop sprayer under 0.25 MPa pressure, using 250 l liquid/ha. The best effect on yield of wheat was recorded from Cecefon 465 SL, followed by Antywylegacz Plynny 725 SL and Moddus 250 EC. Each of these preparations caused a higher increase in grain yield in comparison with the control..