الفهرس 
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Abstract
This study was achieved during two consecutive seasons 2016-2017 and 2017-2018 in the green house of the central laboratory for date palm research and development (CLDPRD) Aswan governorate. This study amid two investigated the effect of Indole acetic acid (IAA) ,Naphthalene acetic acid (NAA) and Indole butyric acid (IBA), as well as offshoots weight on rooting of the offshoots of dry date palm Cv. Sakkouti .
For achieving the previous goal 96 Sakkouti offshoots were presented from a farm Shark Al- Owainat in Egypt. Offshoots were divided into two groups according to their weight. The first group was 8-10 kgs and the other one was 4-7 kgs. All offshoots were dipped in different growth regulators solution for 20 minutes, then dipped in anti- fungicide (rizolex) solution (0.3%) for 5 minutes. Besides, the separation area was covered by car lubricant, then planted in sacks with sandy soil and covered with burlap fabric to protect them. (keep).
The following treatments were carried out in the two experimental seasons as follows: -
- Control dipped in distillated Water
- IAA at a concentration of 3000 ppm.
- IAA at a concentration of 4000 ppm.
- NAA at a concentration of 3000 ppm.
- NAA at a concentration of 4000 ppm.
- IBA at a concentration of 3000 ppm.
- IBA at a concentration of 4000 ppm.
- NAA at a conc of 1000 ppm + IBA at a conc of 2000 ppm.
- NAA at a conc of 1000 ppm + IAA at a conc of 2000 ppm.
- IBA at a conc of 1000 ppm + IAA at a conc of 2000 ppm.
- IBA at a conc of 2000 ppm + IAA at a conc of 1000 ppm.
- NAA at a conc of 2000 ppm + IBA at a conc of 1000 ppm.
- NAA at a conc of 2000 ppm + IAA at a conc of 1000 ppm.
- NAA at a conc of 2000 ppm + IBA at a conc of 2000 ppm.
- NAA at a conc of 2000ppm + IAA at a conc of 2000 ppm.
- IBA at a conc of 2000 ppm + IAA at a conc of 2000 ppm.
Each treatment was of three replicates, one offshoot per each.
After 6 months form cultivation the following parameters were recorded number of new roots per offshoots - root diameter by using vernier caliper - Length of longer root - Length of short root and number of new leaves .
The experiment was set in a complete randomized block design and the obtained data were subjected to the analysis of variances as recommended by Snedecor and Cochran (1989) using new LSD at 5% level of significance to compare between means according to Steel (1980).
The highest values of root number /offshoot were 62.00 and 68.67 in the first and second experimental seasons when dipping offshoots weighing 8-10 kgs in the combination of IAA and IBA each at 2000 ppm. These values were decreased to 31.00 and 27.67 when the same treatment was applied to offshoots weighed 4-7 kgs.
Concerning the effect of growth regulators at any concentration used increased the root diameter of dry date palm Cv. Sakkouti as compared with the control. The difference between them was statistically significant in the two experimental seasons. The weight of offshoots (4-7 and 8-10 kgs) seems to be effective on the root diameter, this was proved statistically only in the first experimental season.
All growth regulators (IAA, NAA and IBA) at any concentration used in this experiment were of positive effect in increasing the length of longer roots compared with the control. These increment reached to 34.33 and 43.67 for offshoots weighed 8-10 kg and 12.00 and 10.67 for offshoots weighed 4-7 kg in the first and second years of the experiment, respectively, when dipped in a solution contained IAA and IBA each at 2000 ppm.
Using Indole acetic acid (IAA), Naphthalene acetic acid (NAA) and Indole butyric acid (IBA) either solely or in combination increased the number of new leaves /offshoots. However, their effect in increasing the number of new leaves were proved statistically compared with control.
The highest weight of offshoots (8-10 kgs) were of more pronounced effect on the number of new leaves compared with the influence of offshoots weight (4-7 kgs). The difference between them was statistically significant in the two experimental seasons.
On the light of the previous results, one can state that using growth regulators, Indole acetic acid (IAA) and Indole butyric acid (IBA) solely at 4000 ppm or in combination each at 2000 ppm is recommended for rooting the dry date palm offshoots Cv. Sakkouti (8-10 kgs).