Physiological and agronomic evaluation of promising cassava (Manihot esculenta Crantz) clones under drought stress conditions.

Abstract:

In Latin America, 45% of the total area of cassava comes from areas with water stress or sporadic rainfall. In addition, the potential for future expansion of the crop is located in marginal areas. However, after 45 days of stress due to water deficit the crop decreases stem growth, increases leaf fall, decreases stomatal conductance and yield. This research was carried out with the objective of evaluating the physiological and agronomic behavior in cassava clones under drought conditions. The statistical design was on strip, to evaluate four clones and four irrigation treatments (25; 50; 75 and 100% of the evapotranspiration of cultivate (Etc)). The most relevant results were:(1) Cassava plants decreased stomatal conductance, and therefore water loss by transpiration and allowed the exchange of CO 2 for photosynthesis under water deficit conditions; the'Guajira 3'and'Bolívar 32'clones protruded physiologically; likewise irrigations 50 and 100% Etc caused a good physiological performance in cassava plants;(2) clones' Guajira 3'and'Bolívar 32'and irrigation 50 and 100% Etc caused the best performance in plant height and (3) depending on the performance, any of the evaluated clones could be recommended and irrigation 25% Etc.

Año de publicación:

2016

Keywords:

Fuente:

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