مختصر البحث:
The current study examined the diagnosis of algal species growing in vegetable farms. Algae-containing soil samples were collected from four farms in the district of Eastern Hamzah (Al-Sharqi). The farms are included okra, eggplant, tomato and cucum…
The current study examined the diagnosis of algal species growing in vegetable farms. Algae-containing soil samples were collected from four farms in the district of Eastern Hamzah (Al-Sharqi). The farms are included okra, eggplant, tomato and cucumber farms, referred to as S1, S2, S3 and S4 during the summer and autumn of 2018. The results highlighted that the number of algae species recorded in the vegetable farms was 66 species, of 39 genera. The blue-green algae (Cyanophyta) were predominant, with 33 species belonging to 12 genera by 50% of the total number of species. Green algae came next with 18 species belonging to 13 genera and by 27.27% followed by diatoms with 13 species of 12 genera composing 19.69%. Finally euglenoidea recorded two species and two genera composing only 3.03% of the total number of species. Some species of algae recorded full dominance in all farms during the autumn of which some species belong to Cyanophyta and species Chroococcus turgidus, Lyngbya limnetica, Oscillatoria
angustissima, Oscillatoria princeps, Oscillatoria tenuis, Phormidium fragile, Phormidium
mucicola, Schizothrix vaginata. Of the Chlorophyt, two species were dominant; Chlamydomonas
reinhardtii, Scyndesmus quadricauda and of Bacillariophyta the only species of Gyrosigma
acuminatum was dominant. In addition, there are species found in all farms during the summer
and autumn, including species Oscillatoria limosa, Sprulina abbreviate belonging to Cyanophyta
and Chlorella vulgaris, Haematococcus lacustris of Chlorophyta as well as the two species
Naviculla cryptocephale, Pinnularia viridis belonging to Bacillariophyta. Most of the species
were dominant in the autumn, especially Cyanophyta. In the summer, only one species was found
in all farms: Mougeotia scalaris of Chlorophyta. The predominance of Oscillatoria was observed
on the rest of the species, especially in autumn. Other species of Cyanophyta; Nostoc,
Phormidium, Anabaena, and Lyngbya also appeared. The highest number of algae was 43 species
in the first farm S1 in the autumn and the lowest number of algae 19 species in the fourth farm S4
in the summer. Shannon and Simpson diversity indexes showed that the highest variability was
(4.043, 0.9805) respectively in the first farm S1 in autumn and the lowest variety of algae was
(3.826, 0.9678) respectively in the fourth farm S4 in the summer.
