الفهرس 
Material and methodsOnly 14 pages are availabe for public view
 |  | from | 201 |  |  |
| | | from | 201 | | |
Abstract
This investigation was conducted during two successive experimental seasons of 1993 and 1994 years in the lath house of the Experimental Station belonging to Faculty of Agriculture, AID Shams University at Shoubra EI-Kheima region. Seeds of four deciduous fruit species namely: a- Pyrus communis ”communis pear”, b- Diospyrus lotus ”persimon”, c- Prunus domestica ”Nemaguard peach” and d- Prunus armeniaca ”Hamawy apricot” were the plant material used in this work. The main purpose of this study aimed to improve seed germination measurements and characteristics of developing seedlings of these rootstocks to attain an adequate vigour within a relative short period that enable nursery men from carrying out graftage at the end of the same growing season of seeds sowing. Therefore, for investigating possibility of accomplishing the abovementioned goal, three main means namely : 11prcplanting / prcstratification soak in some growth regulators and other chemical solutions, 2- Presowing mechanical application of seed coat ”removing of endocarp” and 3- Cold stratification for various periods were studied either solely (simple experiments) or each combined to another ”factorial experiments” in this concern as follows’ :
V.I Part.I : Communis pear ”Pyrus communis” and persimon
”Diospyrus lotus”
V.t.t. Effect of cold stratification period combined with prestratifi-
cation soak in GA solutions on pear and persimon seeds:
In this regard two factorial experiments were conducted each included 15 treatments being representative of the different combinations between five treatments of prestratification soak for 24h. in four GA
--- --- ------
-138-
solutions [a - 0.0 (water), b - 1000, c- 2000 and d-3000 ppm], beside no soaking as control from one hand and three durations of cold stratification [4, 8 and 12 weeks] from the other. Taking into consideration that starting of cold stratification for the three various durations (4, 8 and 12 weeks) was adjusted to be terminated on the same date of sowing seeds i.e., February 15 th 1993 and March 1 st 1994 during 1 st and 2nd seasons. respectively. Accordingly. an independent experiment was devoted for seeds of each fruit species for receiving the following treatments
(combinations) :
1- No soak preceding cold stratification for 4 weeks. 2- No soak preceding cold stratification for 8 weeks. 3- No soak preceding cold stratification for 12 weeks.
4- Soak in GA, 0.0 (water) preceding cold stratific. for 4 weeks. 5- Soak in GA. 0.0 (water) preceding cold stratific. for 8 weeks. 6- Soak ill GA, 0.0 (water) preceding cold stratific. for 12 weeks. 7 - Soak in GA. 1000 ppm preceding cold stratific. for 4 weeks.
8- Soak in GA, 1000 ppm preceding cold stratific. for 8 weeks.
9- Soak in GA. 1000 ppm preceding cold stratific. for 12 weeks. 10- Soak in GA, 2000 ppm preceding cold stratific, for 4 weeks. 11- Soak in GA. 2000 ppm preceding cold stratific. for 8 weeks. 12- Soak in GA. 2000 ppm preceding cold stratific, for 12 weeks. 13- Soak in GA, 3000 ppm preceding cold stratific. for 4 weeks. 14- Soak in GA, 3000 ppm preceding cold stratific. for 8 weeks. 15- Soak in GA, 3000 ppm preceding cold stratific. for 12 weeks.