The effect of the size of potato minitubers and planting distance on the choice of growing technology for PB1 seed production of ‘Jogla’ variety | Kartupeļu sīkbumbuļu izmēra un stādīšanas attāluma ietekme uz PB1 kategorijas sēklaudzēšanas tehnoloģijas izvēli šķirnei ‘Jogla’.
2021
Dimante, I., Institute of Agricultural Resources and Economics, Priekuli, Priekuli Parish, Priekuli Municipality (Latvia) | Skrabule, I., Institute of Agricultural Resources and Economics, Priekuli, Priekuli Parish, Priekuli Municipality (Latvia)
According to the EC Implementing Directive 2014/21 / EU, the first generation of potato seeds under field conditions (PB1) are obtained from PBTC material or minitubers. Potato plant development and its yield are influenced by the weight or size (fraction) of seed tubers, the distance between plants in rows and genotype. Therefore, it is necessary to determine the optimal planting distance depending on the size of minitubers that is part of the seed production technology of the variety. The aim of the two-year study was to assess the effect of minituber planting distance and their size on multiplication rate (expressed as the number of seed-size tubers obtained from one planted minituber), the number and yield of seed-sized tubers per unit area in the first field generation for the new potato starch variety 'Jogla'. The obtained results showed that factors significantly affected all investigated traits. As the planting distance increased, the multiplication rate increased for all minituber fractions, but the number of tubers per hectare decreased (although not always significantly). The yield was affected less consistently. The highest multiplication rate (9.4) was for minitubers of the largest fraction (25–35 mm) having 20 cm distance between plants, the lowest (3.4) for smallest (10–15 mm) minitubers at 10 cm distance. The highest yield (50.7 t haE−1) and the number of seed-sized tubers (993552 per ha) were obtained from the minitubers of the largest fraction planted at 10 cm distance, but the lowest yield (22.7 t haE−1) and the number of seed-sized tubers (307143 per ha) were obtained from the smallest minitubers at 20 cm distance.
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