تأثير بعض المعامالت الكيميائية والفيزيائية على إنبات بذور األفوكادو ) Persea americana )وصفات النمو للنباتات النامية للصنف فيورتي (Fuerte(.

The ever-green avocado tree is of high economic importance. It was introduced to Yemen recently and there is a need to practice its sexual and vegetative propagation, as there is a limitation in the spread of its cultivation and the availability of agricultural seedlings resulting from sexual propagation. The research aims to study the effect of some chemical and physical treatments on the germination of avocado seeds and the growth characteristics of the resulting plants, in order to achieve the highest germination percentage and the best growth of plants. The research was conducted in the nurseries of the Organic Yemen Foundation, Sana’a - Yemen, and included a set of treatments: immersing seeds in different concentrations of gibberellin acid (GA3) (1000, 2000, 3000, 4000 parts per million (ppm)), and indole acetic acid (IAA) @1000ppm, naphthalene acetic acid (NAA) @1000ppm, hot water, and partial immersion of the seeds in tap water until germination begins, in addition to the control treatment (immersion in tap water). Some vegetative growth characteristics were studied (germination percentage, plant height (cm), number Leaves/plant) 60, 90, and 120 days after planting seeds. The research was implemented with a completely randomized design (CRD) in a single factor consisting of nine treatments (T1-T9). The results showed that the two seed soaking treatments in GA3 @1000 and @2000ppm recorded the highest germination percentage in both treatments after 60, 90, and 120 days of planting (73.33-100%) with a significant superiority over the control, the seed treatment with 1000ppm NAA, and the seed treatment with partial immersion in water. The lowest germination percentage recorded for the treatment of partial immersion of seeds in tap water, with a significant decrease (6.6-20%), as well as for the treatment of immersion of seeds in NAA @1000ppm (13.33- 46.66%). The highest plant height was generally recorded for seed soaking treatments in different concentrations of GA3 and other auxins and reached a peak (43.13 cm) using GA3 @4000ppm. The research showed the efficiency of plant growth regulators in accelerating the germination of avocado seeds by a high percentage as well as the growth of developing plants. [ABSTRACT FROM AUTHOR]