Effect of Climatic Factors on the Yield and on the Characteristics Connected to Yielding Ability of Oats (Avena sativaL.)

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Abstract
Relationships between climatic factors and oat yield, as well as 14 morphological characteristics of oat stands, were studied on the basis of data obtained from field trials in three very different growing seasons, in 1986–1988. Linear regression analysis and stepwise regression analysis (backward elimination) were used to clarify how climatic factors affect the yield formation of different oat genotypes. The mean temperature, daily global radiation, and daily number of sunshine hours had quite strong negative correlation with grain yield and with most of the examined characteristics—e.g. earliness, plant height, phytomass, panicle weight, and size of flag leaf. Relationships between rainfall and oat characters were usually positive and quite clear. The temperature sum did not strongly affect the formation of studied characters. Phenotypic stability and indirect selection in yield breeding of oats is discussed.