Evaluation of potato varieties for organic farming
2005
Skrabule, I., Priekuli Plant Breeding Station, Cesis reg. (Latvia) | Gaile, Z., Latvia Univ. of Agriculture, Auce, Dobele reg. (Latvia). Training and Research Farm Vecauce | Vigovskis, J., Agency of Latvia University of Agriculture, Skriveri, Aizkraukle reg. (Latvia). Research Institute of Agriculture
The suitability of potato varieties for organic farming was evaluated in certificated organic fields. Two medium early varieties ('Sante', 'Lenora') and four medium late varieties ('Brasla', 'Bete', 'Zile', 'Magdalena') were estimated during two years. The tests were carried out in three trial places: Priekuli, Vecauce, Skrīveri. The influence of growing conditions and variety were significant on potato tuber yield. The yields of medium early varieties mostly did not differ significantly in each place both years. The highest average yield between medium late varieties was observed for variety 'Bete'. Leaf resistance of medium early variety 'Lenora' to late blight (Phythophthora infestans (Mont.) de Bary) exceeded resistance of the variety 'Sante'. Medium late varieties 'Bete' and 'Zile' had comparatively high resistance to late blight. The starch content of variety 'Brasla' was more than 15% (acceptable for starch production) in each place both years. The comparatively less common scab (Streptomyces scabies (Thaxter) Waksman and Henrici) damages were observed on tubers of variety 'Lenora', and black scurf (Rhizoctonia solani Kuhn) blemishes - on variety 'Sante' tubers. The most suitable for organic farming were varieties 'Lenora' and 'Zile', but for specific utilisation purposes (starch production or cookery) 'Sante', 'Brasla' and 'Bete' were acceptable.
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