Postharvest Quality of Tablestock Potatoes in Response to Drip Irrigation and Harvest Time

Mildred N Makani, Steven A Sargent, Lincoln Zotarelli, Joel Reyes-Cabrera

Abstract


Effect of irrigation method and harvest time on quality and storability of potato tubers was evaluated. ‘Fabula’, a tan-skinned, yellow-fleshed tablestock variety, was irrigated using surface drip (SD), sub-surface drip (Sub-SD), or seepage (SP) irrigation. Tubers were harvested 1, 2, and 3 weeks after vine kill (H1, H2, and H3), and then stored for 14 d at 10 °C and 90% to 95% relative humidty. Similar total yields of 26,104 kg·ha–1and 26,983 kg·ha–1 were obtained for SP and SD, respectively, while yields were lower for Sub-SD (18,918 kg·ha
–1). Changes in tuber fresh weight, dry matter content, bioyield, and ascorbic acid content were evaluated each 7 d during storage. An interaction of irrigation method and storage time had an effect on dry matter content of tubers harvested 1 week after vine kill (H1). However, no significant differences in tuber storage quality were observed at the other two harvest times. The results indicated that comparable tuber yield and quality can be obtained for SP and SD irrigated ‘Fabula’ plants. This is especially true when tubers are harvested 2 to 3 weeks after vine kill.


Keywords


Solanum tuberosumL., new potatoes, irrigation method, storage, bioyield, ascorbic acid, dry matter content, fresh weight

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Proc. Fla. State Hort. Soc.     ISSN 0886-7283