Klormekvatin (CCC) vaikutuksesta viljakasvien satoon ja kasvutapaan

Authors

• Yrjö Pessi Rikkihappo Oy, Helsinki
• Mikko Ylänen Rikkihappo Oy, Helsinki
• Auvo Leskelä Rikkihappo Oy, Helsinki

DOI: https://doi.org/10.23986/afsci.71758

Abstract

At the Kotkaniemi Experimental Farm at Vihti it has been possible to shorten and strengthen the straw of winter cereals, spring wheat, four- and six-row barley, and oats by using Chlormequat (CCC) which has resulted in a decrease in lodging. The greatest increase in the grain yield was achieved with spring wheat, the following in order were rye, barley, and winter wheat. The treatment did not wholly eliminate the lodging of rye but it did prevent the rye from lodging before blooming. Results achieved with treatment of winter wheat with Chlormequat varied each year. The straw of barley and oats was also distinctly shorter and in some cases even an increase in grain yield could be noticed. The later the spring treatment, the more the straws of cereals shortened. In practice, however, preference has to be given to the time point of weed control when attention is paid to increase in grain yield and to other viewpoints. In favourable growth conditions and under heavy fertilization, the increase in the grain yield caused by Chlormequat treatment is at its greatest. In unfavourable conditions the increases in grain yield are small and the grain yield may even decrease.