No abstract

Einflufl von Chlornbolincblorid (CCC) 233the higher potassium supply. The contents of protein nitrogen rose with the nitrogen nutrition. Potassium reduced the content of protein nitrogen in treatments with high growth rates.4. Related on a single plant the incorporation rate of nitrate nitrogen into the organic matter was higher in plants with a good potassium nutritional status than in plants with a low potassium nutritional status. This effect was especially evident in the treatments with the highest nitrogen supply. Here the nitrate incorporation rate was 5-7 times higher with the higher potassium application. 5.This favorable effect of potassium upon the msimilation of nitrate nitrogen was also evident, if the incorporation rate was not related to a single plant, but on *) 63 GielJen, Braugasse 7

Identification and determination of some gibberellins in the gibberellin spectrum of some cereals, als affected by CCC treatment The gibberellin contents of wheat, barley and oat plants, treated with CCC, were studied during the vegetative period. It was possible to identify a characteristic gibberellin spectrum for every cereal plant examined, although the variation was in a limited number of gibberellin forms. A great variation in the content of individual gibberellic acid forms was noticed, as well, among the different cereals studied. The highest content of gibberellins was found with GA3. The content of GA5 was lower than that of GA9 while was not generally higher than that of GA8. CCC‐treated cereal plants showed lower values of gibberellins when compared with those of control. On the other hand, CCC treatment did not affect the content of gibberellins in the spikes which showed a considerably high content of GA3, GA5 and GA9. A higher content of GA7 was observed in both barley and oats, but not in the case of wheat, during tillering stage. However it was difficult, from the results of the present work, to indicate whether GA7 is reponsible for the week effect of CCC obtained with both barley and oats or not.

Influence of Ethrel upon morphology and sugar content of sugar beet Repeated spraying of growing sugar beet plants with 100 and 200 ppm solutions of Ethrel changed the shape of the storage roots and reduced their sugar content. When CCC was added to the Ethrel solutions, the negative influence of Ethrel upon the sugar content was nearly abolished.

No abstract