Agronomic index to determine tolerance to drought in varieties of potato (Solanum tuberosum L.)
Authors: Alfredo Morales Rodríguez , Alfredo Morales Tejón & Dania Rodríguez del Sol
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During recent seasons, drought has caused losses of 50 % of potato production in several countries in Central America. Knowledge and use of varieties tolerant to drought is a key to increase potato production and yield under stress conditions. The experiments were done in the Research Institute of Tropical Roots and Tubers Crop (INIVIT) during the months of December 2014 to March 2015. Ten plots per variety were planted; half of them (five) was withdrawn irrigation to after 50 days after planting for 20 days (period of drought stress) irrigation restarting after 70 days. At the harvest time it was determined: the Stress Susceptibility Index (SSI), Stress Tolerance Index (STI ), Tolerance Index (TOL), Mean Productivity ( MP) and Yield Stability Index (YSI ). Atlas and Maranca varieties have the lowest values of SSI, with 0,67 and 0,61 respectively, and the highest values of STI, with 0,79 and 0,81 respectively. MP recorded the highest was in the Atlas variety, with 19.92 t/ha. Higher values of YSI belong to Atlas and Maranca varieties, with 81,07 and 79,29 % respectively.