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No presente trabalho são relatadas experiências com 12 variedades de batatinha (Solanum tuberosum L.), recebidas da Holanda (Prinslander, Irene, Froma e Barima), Alemanha (Merkur, Sabina, Linda e Concordia) e Suécia Konsuragis, Eigenheimer, Voran e Jätte-Bintje). Essas experiências, em número de seis, das quais três no chamado período "da sêca" (março-julho) e três no "das águas" (setembro-janeiro), foram executadas nas localidades de Campinas, Louveira o Capão Bonito, no Estado de São Paulo. Ficou evidenciado o seguinte: a) dado o bom estado de brotação dos tubérculos, as porcentagens de falhas no plantio "da sêca" foram baixas; já no plantio "das águas", as variedades de brotação lenta, como "Voran" e "Sabina", falharam muito; b) "Prinslander" e "Konsuragis" resistiram bem à sêca prolongada, e "Barima" o "Linda" mostraram ser muito sensíveis; c) "Linda", "Voran" e "Merkur", principalmente a primeira destas, apresentaram boa resistência a Phytophthora infestans, e "Jätte-Bintje" foi muito suscetível; "Voran", "Irene", "Prinslander" e "Barima" não ofereceram resistência a Alternaria solani; d) "Merkur" e "Konsuragis" foram as mais produtivas para as duas épocas de plantio, sendo que "nas águas", "Eigenheimer", "Barima", "Concordia" e Jätte-Bintje", também produziram bem. Outros aspectos relacionados com variedades foram estudados. Twelve potato varieties imported from Holland (Prinslander, Irene, Froma, and Barima), Germany (Merkur, Sabina, Linda, and Concordia), and Sweden (Konsuragis, Eigenheimer, Voran, and Jätte-Bintje) were compared in six experiments carried out at three different localities in the state of São Paulo (Campinas, Louveira, and Capão Bonito). The experiments were planted twice a year, once during the so-called dry season (March lo July), and another time during the rainy season (September to March). The following results were obtained: a) plantings made in the dry season had a good stand, whereas this was poor in the rainy season for the late varieties, Voran and Sabina; b) Prinslander and Konsuragis showed good drought resistance, but Barima and Linda did not; c) Linda, Voran, and Merkur showed resistance to Phytophthora blight, the first-mentioned variety being the most resistant; Bintje was susceptible to the same disease. The varieties Voran, Irene, Prinslander, and Barima were susceptible to early blight; d) Merkur and Konsuragis were the highest yielders in the two planting seasons, but iu plantings made in the rainy season Eigenheimer, Barhna, Coueordia, and Jiitte-Bintje yielded as well as them

Variedades de batatinha (Solanum tuberosum L.). I - Comportamento de 12 variedades procedentes da Holanda, Alemanha e Suécia