Einfluß von Monoethanolamin auf den Ertrag von Kulturpflanzen

Abstract

Abstract Effect of monoethanolamine on yield of crops I. Studies on the effect of monoethanolamine on the grain yield and the nitrogen household in cereal plants (pot experiments) The effect of monoethanolamine (EA, applied as foliar spray, 10 mg per pot) on grain yield and yield components was investigated in pot experiments with spring barley, winter wheat, and winter rye. Under conditions of a moderate drought stress the applied EA increased the grain yield of spring barley from 5 % to 7 % (significance only at α= 0.05). A stimulating effect of EA on the grain yield of winter wheat and winter rye was also obtained.The positive influence of EA on the grain yield of spring barley was reproducible under the conditions of a limited water supply in small‐scale plot experiments (increase of yield about 9 %).In case of spring barley and winter rye the increase of the grain yield by EA, applied at growth stage 31 (= DC 31) was connected with a greater number of ear‐bearing tillers. The increase of the winter wheat yield resulted from more grains per ear of the tillers.The enhanced formation of tiller grain mass and total tiller biomass by EA was in correlation with a higher nitrogen import into tillers (r = 0.8+). Since an export of N from the main shoots into the tillers was not observed a higher N uptake (≥ 6 %) was calculated from N balances. After a fertilization with 15N‐labelled fertilizers the additional 15N uptake was 13 % to 20 %.Possible stress reducing activities caused by EA are discussed.