Abstract

MORALES GUEVARA, Donaldo et al. QuitoMax effect on growth and yield in potato crop (Solanum tuberosum L.). cultrop [online]. 2015, vol.36, n.3, pp. 133-143. ISSN 1819-4087.

The aim of this work was to evaluate some components of the growth and yield in potato plants (Solanum tuberosum L.) previously treated by foliar spray with different doses of QuitoMax (bioproduct based on chitosan polymers) at two moments of crop development. The work was conducted over three crop cycles (2009-2010, 2010-2011 and 2011-2012). At first cycle, besides the control where the product was not applied, three QuitoMax treatments were sprayed. A dose of 300 mg ha^-1 at 30 or 50 days after planting and another treatment in which two doses of 150 mg ha^-1 were applied at 30 and 50 days after planting. In the following two cycles in addition to control, nine treatments at doses of 100, 300 and 500 mg ha^-1 at both 30 and at 50 days after planting were applied, another three treatments where doses of 50, 150 and 250 mg ha^-1 were applied at the two moments above mentioned. The variables studied were the length and diameter of stems, number of leaves and tubers per plant, the average tubers fresh weight and the percentage of dry mass. Yields were estimated based on tuber fresh and dry masses. The analysis of the results showed the best response when the plants received two QuitoMax applications, highlighting the dose of 150 mg ha^-1, which caused a superior yield increment of 15 % in relation to control no applied

Keywords : chitosan; growth; yield; potato.

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