In recent years, the production and quality of autumn oats have been influenced by the evolution of climate change, characterized by high temperatures and low rainfall.This agricultural year is part of the evolution of the climate through a very warm autumn, extremely poor in rainfall, which led to a difficult preparation of the germination bed for sowing, of poor quality, and the growth of the crop began in winter and ended in next spring. Rainfall and storms in June and July caused a strong fall of plants with major consequences on the quantity and quality of production and delaying the optimal time for harvesting.The ideal production for oats is about 6 tons per hectare, but depending on climatic conditions, technologicaland quality parameters, this value can fluctuatefor autumn oats, an essential requirement is frost and winter hardness, which is also conditioned by other factors.In this study, 15 genotypes from the comparative competition culture for autumn oats were analyzed in the Oat Breeding Laboratory of S.C.D.A. Lovrin to determine the factor with the greatest influence on production in terms of chlorophyll variation,blade thickness and leaf area. Thus, the impact of the flag leaf on the production parameters was determined, by establishing the factor with the most obvious influence.The parameters studied in this experiment were leaf area, leaf blade thickness and chlorophyll content. The flag leaf was used for the indicated determinations. In each of the 15 variants, 40 standard leaves were harvested and analyzed in the laboratory, using the following devices: LI-300 Portable Area Meter (leaf surface) and SPAD 502 Chlorophyllmeter.Following the evolution of production in the analyzed period under the influence of the 3 factorsstudied, we can conclude the following: when the chlorophyll content increases by 1%, the production increases by 0.26%; when the thickness of the leaf blade increases by 1%, the production decreases on average by 0.13%; when the leaf area increases by 1%, the production decreases on average by 0.001%.