Eco-physiological yield determinants of potato processing varieties grown in the Argentinian pampas

SANTOS, DIEGO; MONZON, JUAN PABLO; CALDIZ, DANIEL; ANDRADE, F.H.

Cusco

Congreso; 10th World Potato Congress; 2018

CIP

This research was performed to compare the eco-physiological yield determinants of four potato processing varieties used by the French fry industry in Argentina. The trial was carried out in the southeast of Buenos Aires province, Argentina (37°87´ S, 58°14´ W), for the varieties: Innovator, Daisy, Millennium Russet and Royal. Intercepted radiation, total biomass and tuber yield were assessed during crop growth. The highest tuber dry matter yield was 1400 g mˉ² for Royal, which was almost 50% higher than those for Innovator and Daisy, and 22% higher than that for Millennium Russet. The photosynthetically active intercepted radiation (PARint) in the whole cycle was 658 MJ for Royal, a value that was 34%, 27% and 10% higher than those for Innovator, Daisy and Millennium Russet, respectively. Radiation use efficiency (RUE), also varied among cultivars; it was 2.57 g MJ-1 for Royal, resulting 27%, 16% and 11% higher than those observed for Daisy, Millenium Russet and Innovator, respectively. Harvest index (HI) varied between 0.82 and 0.88, being higher in Daisy and Millennium Russet. The length of crop cycle, through its influence on PARint, was the most important factor determining total biomass and tuber yield. RUE, which varied among cultivars, was the second factor in importance, while HI had the lowest incidence on tuber yield.