Abstract

ALMEIDA, Fernando M. de; NOVAL, Walfredo Torres-de la; CABRERA-RODRIGUEZ, Juan A.  and  ARZUAGA-SANCHEZ, Jorge. Growth of potato plants (Solanum tuberosum L. cv Romano), in Huambo province, Angola, under two planting densities. cultrop [online]. 2018, vol.39, n.3, pp. 31-40. ISSN 1819-4087.

The growth dynamics of potato plants (Solanum tuberosum L.), under the edaphoclimatic conditions of Huambo, Angola, with two row distances, were evaluated by planting “seed” tubers (35-45 mm caliber), in October 2011, 2012 and 2013, under two densities of plantation (0,75 x 0,30 and 0,90 x 0,30 m, distances between rows and between plants, respectively). The dynamics of the average height of the main stem, the fresh and dry masses of the tubers were evaluated, which were adjusted by means of the regression analysis to different mathematical functions, in order to estimate their dynamics and obtain different indicators, the nutritional status was diagnosed 45 days after planting, in 2013, by means of foliar analysis. The tubers were started before plants reached their maximum Absolute Growth Rate (TAC) in stem lenght, which suggests the establishment of a competition for assimilates between organs. The fresh mass of the tubers was more influenced by the density of plantation, with an advance in the growth with superior values of the TAC and the maximum fresh mass, in the minor. The plants showed a deficient nutritional status; however, planting at lower density reached a less unfavorable level. The dynamics of the evaluated variables, showed that the climate is suitable for the development of the plants and point to the water supply during the “linear” growth of the tubers, and to the mineral nutrition, as aspects for a future optimization of the crop

Keywords : height; tuber weights; growth analysis; distances between rows.

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