SodininkyStĖ ir darŽininkyStĖ 28(2)

17. Willaume M, Lauri P. É, Sinoquet H. 2004. Light interception in apple treesinfluenced by canopy architecture manipulation. Trees, 18: 705–713.18. Wünsche J. N., Lakso A. N., Robinson T. L., Lenz F., Denning S. S. 1996. Thebases of productivity in apple production systems: the role of light interceptionby different shoot types. Journal of the American Society of HorticulturalScience, 121: 886–893.19. Wünsche J., Lakso A. N. 2000. The relationship between leaf area and lightinterception by spur and extension shoot leaves to apple orchard productivity.HortScience, 35: 1 202–1 206.20. Zarco-Tejada P. J., Miller J. R., Mohammed G. H. and Noland T. L. 2000.Chlorophyll fluorescence effects on vegetation apparent reflectance: I Leaf-levelmeasurements and model simulation. Rem. Sens. Environ., 74: 582–595.21. Гавриленко В. Ф., Ладыгина М. Е., Хандробина Л. М. 2003. Большойпрактикум по физиологии растений. Aкaдемия, Москва.SODININKYSTĖ IR DARŽININKYSTĖ. SCIENTIFIC ARTICLES. 2009. 28(2).Assimilation indexes of cultivar ‘Auksis’ on rootstock P 22 with differentcrown formsG. Šabajevienė, N. Uselis, P. DuchovskisSummaryAssimilation indexes and photosynthetic pigment content in apple tree leavesof cv. ‘Auksis’ on P 22 rootstock had been investigated at the Lithuanian Institute ofHorticulture in 2005–2007. Apple trees were trained as spindle, slender spindle and freeleader axis. Orchards were planted according to 3 × 1 m planting scheme. Significantlyhighest assimilation indexes were detected in apple trees trained as free leader axis. Jnthe first year of investigation the higher number of flowers and yield were formed on freeleader axis form trees. In 2006 and 2007 the highest yield and flowering were found inapple trees with narrow size slender spindle canopies, in which leaf area index was ~1.Key words: apple tree, assimilation indexes, leaf area index, canopy form, photosyntheticpigments, yield.19