SUMMARYIn pot experiments with oats, the supply of nitrogen and simazine was varied in such a way that t0 quantities of nitrogen and 6 quantities of simazine were combined factorially. Green oat plants, oat grain, and oat straw were examined for content of dry matter, total nitrogen as weil as for phosphorus, potassium, sodium, calcium, and magnesium. Furthermore the grain was analyzed for amino acids.The investigations have shown that the course of the yield curve for nitrogen can be varied by application of simazine in such a way that it becomes sigmoid. The courses of the respective yield and concentration curves show that an unfavourable ratio of the plant nutrients applied, for example with the very lowest or the very highest nitrogen supplies, causes a high concentration of nitrogen, i.e. a low utilization of the absorbed nitrogen. This low utilization is strengthened by the application of simazine. Reduced yield of dry matter, either due to unfavourable ratios of the plant nutrients applied or to the application of a metabolic inhibitor -in this case simazine -causes in both cases an increase in the nitrogen concentration, i.e. a falling utilization of the absorbed nitrogen. The curves were, broadly speaking, affected in the same way, whether due to varied ratios of the plant nutrients applied, or to varied applications of simazine.With nitrogen supplies producing maximum yield at maturity, the amount of nitrogen absorbed is the same, independent of the application of simazine, but the utilization of the quantity of nitrogen absorbed in the production of dry marter falls when simazine is applied. The fall in the utilization is less pronounced at a nitrogen supply of 3 g per pot and above.Increasing nitrogen supplies cause an increase in the glutamic acid, histidine and arginine content of the protein of the oat grain, while the content of the other amino acids is comparatively unaffected. In the treatment without nitrogen, simazine had the same effect on the amino acid composition of the protein as the application oi nitrogen, while in the other treatments where 476
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