Scientific Papers Series B Horticulture

“Clapp’s Favorite” in 2011 where the height ofthe tree constituted 170 cm and “Max RedBartlett” in 2012 with the height of the treeconstituted 200 cm. The highest values for thisparameter was registered in “Abbé Fétel” inboth seasons, with the height of the treeconstituted 250 cm in 2011 and 280 cm in 2012whereas in other varieties the recorded valueswere intermediate (table 1).Values of the trunk thickness comprisedbetween 2.10 and 2.93 cm in 2011 registeredthe pear tree varieties: “Max Red Bartlett: (2.70cm), “Clapp’s Favorite” (2.10 cm), “BeurréBosc” (2.62 cm), “Alexander Lucas” (2.50 cm),“Abbé Fétel” (2.93 cm) and “Conference”(2.88 cm). In 2012 the recorded values wereplaced between 2.80-3.82 cm with lowestvalues at “Clapp’s Favorite” (2.80 cm) andhighest at “Conference” variety (3.82 cm).Growth of trees, expressed as a trunk crosssection area registers extreme values,comprised between 3.5 cm 2 at “Clapp’sFavorite” variety and 6.7 cm 2 at “Abbé Fétel”variety in 2011. In the next year the valuescomprised between 6.2 cm 2 at “Clapp’sFavorite” variety and 11.6 cm 2 at “Max RedBartlett”. The data from 2011 were statisticallyprocessed as compared to the average of thetrial, used as control and pointed out verysignificant positive differences at “Abbé Fétel”and significant positive differences in case of“Conference” variety. In 2012 two varietiesshowed significant positive differences fromthe average of experience, respectively“Conference” and “Max Red Bartlett”.Significant negative differences, as comparedwith average, taken as control, registered the“Clapp’s Favorite” variety. Vigour withinsignificant differences, as compared withaverage had the varieties “Beurré Bosc”,“Clapp’s Favorite”, “Alexander Lucas”, “MaxRed Bartlett” in 2011 and “Abbé Fétel”,“Beurré Bosc” and “Alexander Lucas” in 2012.The average of annual vegetative shoot growthin 2011 was 147.8 cm/tree in “Clapp’sFavorite”, 257.8 cm/tree in “Beurré Bosc”,288.2 cm/tree in “Alexander Lucas”, 320.1cm/tree in “Conference”, 327.7 cm/tree in“Max Red Bartlett” and the highest value(413.5 cm/tree) in “Abbé Fétel”. In 2012 theregistered values were as follows: 346.5cm/tree in “Alexander Lucas”, 360.1 cm/tree in“Clapp’s Favorite”, 386.8 cm/tree in “AbbéFétel”, 405.6 cm/tree in “Conference” and 411cm/tree in “Beurré Bosc” varieties (fig. 3). In2011 trees from “Conference”, “Abbé Fétel”and “Max Red Bartlett” produced more longshoots than the average of trial (292.5 cm/tree).In 2012 the varieties mentioned above andadditional “Beurré Bosc” produced long shootsmore than the average (384 cm/tree).In 2011, a large number of vegetative spursproduced “Conference” (68) and “Beurré Bosc”(45) while “Max Red Bartlett” and “Clapp’sFavorite” formed the fewest number of spurs(39 and 38).Table 1. Vegetative growth in 2011 and 2012DifferencesTransversal cross sectionTree height (cm) Trunk thickness (cm)Pear variety(cm 2 as to average Significance)(cm 2 )2011 2012 2011 2012 2011 2012 2011 2012 2011 2012Abbé Fétel 250 280 2.93 3.48 6.7 9.5 +1.3 +0.35 NConference 210 250 2.88 3.82 6.5 11.4 +1.1 +2.25Beurré Bosc 190 250 2.62 3.28 5.4 8.5 0 -0.65 N NClapp’s Favorite 170 220 2.10 2.80 3.5 6.2 -1.9 -2.95 NAlexander Lucas 180 210 2.50 3.14 4.9 7.7 -0.5 -1.45 N NMax Red Bartlett 180 200 2.70 3.84 5.7 11.6 +0.3 +2.45 NAverage 196.6 235 2.62 3.39 5.4 9.15 - - - -DL 5 %=0.80 cm 2 (2011) N= not significant DL 5%=1.8 cm 2 (2012)DL 1%=1.14 cm 2 *= significant difference DL1%=2.5 cm 2DL 0.1%=1.65 cm 2 **= distinctive significant difference DL 0.1%=3.7 cm 2263