Resumo

NUSTEZ LOPEZ, Carlos Eduardo; SANTOS CASTELLANOS, Marcela  e  SEGURA ABRIL, Mariela. DRY MATTER ALLOCATION AND PARTITIONING OF FOUR POTATO VARIETIES (Solanum tuberosum L.) IN ZIPAQUIRÁ, CUNDINAMARCA (COLOMBIA). Rev. Fac. Nac. Agron. Medellín [online]. 2009, vol.62, n.1, pp.4823-4834. ISSN 0304-2847.

This investigation evaluated the dry matter production and partitioning of four potato varieties (Solanum tuberosum L.) in the Zipaquirá town (Cundinamarca Department) one of the biggest production zones of potato in Colombia. Betina, Pastusa Suprema and Esmeralda (varieties developed by the program of genetic improvement of potato of the Faculty of Agronomy of the Universidad Nacional de Colombia) and Diacol Capiro variety (that is one of those more sowed in the country) were evaluated. The dry matter was determined at random of each one of the plant organs, samplings were taken of three sowing places. This procedure was carried out every two weeks during the crop cycle. Differences were observed regarding the behaviour of dry matter accumulation in leaves and stems, Pastusa Suprema presented the biggest accumulation in these organs in the 16 weeks after emergency (WAE). Betina and Esmeralda accumulated the main part of the tuber dry matter in the final stage of the crop cycle, between the 16 and 18 WAE, whereas Diacol Capiro and Pastusa Suprema accumulated dry matter in these organs in progressive form along the crop cycle. The Pastusa Suprema variety presented the smallest Harvest Index with 72% being inferior to the Diacol Capiro, Esmeralda and Betina varieties. Due to this high dry matter partition to the tubers en the final stage of crop cycle, does not recommended the agronomic practice of "branch cut", because it can reduce the yield in these varieties.

Palavras-chave : Physiology; growth; harvest index; spp. andigena.

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