Sayed Ibtissem’s scientific contributions

The objective of the experiment is to study the germination and growth of young seedlings of the exotic fruit species (Persea americana Mill). It was conducted at the level of the botanical garden and educational greenhouse of the Agronomy department at the University of 20 th August, 1955-Skikda (Algeria). The principle of the experiment was to compare the effect of 4 growing substrates on seed germination, and the growth of young plants of the species studied by testing five parameters that are: germination time, germination rate, the number of new branches, the number of leaves and the height of the stems. The obtained results revealed that the best values of germination and growth parameters were those recorded for treatments carried out under educational greenhouse. According to the obtained results, the best substrates for the cultivation and propagation of Persea Americana Mill are 80% earth + 20% peat, 55% earth + 25% sand + 20% peat, and 80% earth + 20% peat. In addition, Sand-only substrates (100% Sand), give favorable results for the speed of growth and the development of avocado seedlings after germination. For the germination of grains, the results are better in terms of germination quality unlike the results relating to quantitative aspects.

The objective of this study was to test the effect of the use of a plant-based hormone on the growth of young shoots of avocado (Persea Americana Mill.). The experiment consists in studying the effect of the phytohormone extracted from the branches of (Salix babylonica L.) on a number of growth parameters in avocado seedlings (Persea americana Mill.), obtained after sowing seeds in four different mixtures of substrates and raised in two different sites namely; the botanical garden and the breeding greenhouse. The growth parameters were tested: the number of leaves, the number of branches (New branches) and the height of the main stem. The results showed significant variations in the growth parameters of avocado seedlings between the different treatments and the two experimental sites. The best results were those obtained in avocado seedlings treated with phytohormone, planted in substrates: S3 (25% sand + 55% earth + 20%peat) and S4 (55% sand + 25% earth + 20% peat). For substrates S1 (80% earth + 20% peat) and S2 (80% sand + 20% peat), the difference between the results was not significant; the difference in growth between untreated and phytohormone-treated seedlings was found to be negligible.