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CERNÝ, I., VEVERKOVA, J., KOVAR, M., PACUTA, V., MOLNAROVA, J.: Infl uence of temperature and moisture conditions of locality on the yield formation of sunfl ower (Helianthus annuus L.). Acta univ. agric. et silvic. Mendel. Brun., 2011, LIX, No. 6, pp. 99–104 Field polyfactorial experiments were realized on fi elds of the Agricultural Co-operative in Nitrianska Blatnica in years 2007−2009. Experimental fi eld is located in the maize production area (climatic region: warm; climatic sub region dry; climatic zone: warm, dry with mild winter and long sunshine) in altitude 250 m above sea level, with brown soil. We observed the infl uence of both temperature and moisture conditions of experimental area on sunfl ower yield of achenes (conventional, medium-late hybrids: NK Brio, NK Armoni). Preceding crop of sunfl ower (Helianthus annuus L.) every experimental year was wheat (Triticum aestivum L.). Technological system of sunfl ower cultivation was realized in accordance with conventional technology of cultivation. The basic fertilization was made by balance method on the base of agrochemical soil analysis for expected yield 3 t.ha −1 . The meteorological data were got out from agrometeorological station of the Central Controlling and Testing Institute in Agriculture in Veľke Ripňany. During every experimental year the change of inner energy (ΔU) was evaluated for thermodynamic characteristic analysis (security of the temperature and moisture) and the impact of changes on yield forming with maximal yield (Y max in 2008) and minimal yield (Y min in 2009). Achieved value of yield from thermal and precipitation energy introduces concrete energy amount, which is available in given period for concrete height of yield. From the results follow, the sunfl ower has got critical thermodynamic phase in the period of months from July to August. For the yield formation is requirement, that input power of precipitation prevailed over the thermal during moths July to August. Achieved results confi rmed statistically high signifi cant dependence of the yield on weather conditions and for high annual variations in climatic characteristics the consideration is needed about potential changes some agrotechnological measures of technological system of sunfl ower cultivation.

Influence of temperature and moisture conditions of locality on the yield formation of sunflower (Helianthus annuus L.)