The aim of our experiment was to determine how the different methods of designing (direct sowing/seedlings with different number of plants per cell) of Welsh onion (Allium fistulosum L.) effect on yield quantity and quality. The experiment started on February 17th, 2017, when seeds were sown into the plug trays, until July 25th, 2017 in a glasshouse and continued in a plastic greenhouse on Laboratory field at the Biotechnical Faculty in Ljubljana. We included two methods of crop design into experiment: direct sowing in the soil (sowing across and sowing in rows) and two ways of designing the crop through cultivation of seedlings with plugs (seedlings with 1 plant and seedlings with 3 plants per plug). The results of the experiment showed that the most leaves were developed (6,3) when the crop was planted with seedlings with 1 plant, and the least (4,1) at direct sowing across. With the design of the crop by planting seedlings with 1 plant, we reached an average height of 88 cm, while designed with direct sowing across reached an average height of 66,4 cm. The length of the false stem is also important for determining the harvesting time, which should not be less than 7-10 cm according to the genreal recommendations. In our experiment, on average, the lowest false stems reached plants where the crop was design with direct sowing across (17,6 cm) and the highest in the design of a crop with seedlings with 1 plant (25,5 cm). The lowest yield was in the design of the crop with direct sowing across (16,7 t/ha) and the highest in planting seedlings with 3 plants per plug (44,9 t/ha). From obtained results we can conclude that the best quality crop is produced by modern method od designing the crop through planting seedlings with one plant.
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