Агробіологічний аналіз тривалості настання фенофаз у рослин ячменю ярого в процесі вирощування залежно від способу передпосівного обробітку ґрунту

Purpose. To investigate the features of phenological stages onset in spring barley depending on the method of seedbed preparation. Methods. General scientific methods (observation, comparison, analogy, generalisation and specification); special methods (field method to identify differences between the experimental treatments regarding the duration of phenological stages onset). Treatments: seedbed preparation to a seed burying depth of 2–3 cm; closing moisture by harrowing and leveling the soil surface with cultivator to a depth of 7–8 cm. The row spacing was 15 cm. Seeding rates were 250, 300, and 350 seeds per 1 m2, the phenological stages onset was recorded in four trial plots of 1.0 m2. Results. The prolonged effect of long-term germination of spring barley at all seeding rates, depending on the method of seedbed preparation, on the duration of achieving the phenological stages (germination, three leaves, and leaf-tube formation) was established. It was demonstrated that under the first method of seedbed preparation, the process of forming full seedlings lasted for four days, the development stage of three leaves developed occurred for five days, the onset of the stage of emergence into the tube also occurred for five days. Under the second method of seedbed preparation, germination lasted for seven days, the stage of three leaves was formed for eight days, and leaf tube formation lasted for seven days. Conclusions. It has been established that when seedbed preparation is carried out in a way that involves closing the moisture by harrowing and leveling the surface with cultivator to a depth of 7–8 cm, a prolonged process of germination and crop formation occurred at the stages of seedlings, three leaves (the beginning of tillering) and the leaf-tube formation.