Avaliação de doze variedades de batata-doçe -ipomeaea batatas (l.) Lam a seis diferentes épocas de colheita em Umbelúzi- Boane Maputo

Abstract

The present work was carried out in the agrarian season of Umbelúzi, Boane District, Maputo Province, between September 2003 and June 2004 with the aim of evaluating the yield of 12 sweetpotato varieties in six different harvest periods. The varieties used were maria, queen, muamambiquir, tis 8266, tis 5125, cnn1448-49, jonathan, singano, nhamatshaima, jopon-select, tis 70/357 and tis 81/723 which were harvested between January and June 2004. O The trial was set up using a randomized complete block design, with 3 replications, no fertilizer was applied and spraying was made against the American caterpillar during the course of the trial. Production results were collected every 30 days from January to June and samples of each variety were taken to the laboratory for the determination of dry matter of vines as well as tubers and finally analyzed using the SAS statistical package. The variety tis 5125 had the highest yield of commercial roots followed by nhamatshaima, tis 70/357 and maria. In terms of production of the number of useful vines, the muamambiquir, jonathan and tis 5125 varieties had the highest number of useful vines. With regard to vine length, the maria, tis81/723 and nhamatshaima varieties had greater length. In relation to dry matter, the varieties tis 5125, maria and tis 70/357 are the ones with the highest percentage of dry matter in the roots