Grade price relationship of lowland Spunta potato tubers in Chiang Mai province, 1992 [Thailand]
1993
Grittiga Akanitapichart
Study was conducted during 1992 in the potato growing areas of Chiang Mai province. It dealt with growers, traders and a Potato Growers' Cooperative which produced and traded lowland Spunta potato tubers. The study aims to assess the growers' economic returns on graded and ungraded potato tubers and to analyze grade factors determining the price of potato tubers. The results of the study show that the diameter and length of potato tubers significantly influence the price of tubers of all grades. However, diameter is found to cause larger price changes than length. Moreover, a better grade is found to fetch a higher price. Therefore, on a monetary basis, if growers graded potatoes before selling, they would receive better prices and earn a higher income at 1.67 baht per kilogramme over the ungraded potatoes they now sell. At present, the trading of potato tubers is based on unofficial grades. It is, therefore, recommended that an official grading system of potato tubers be established using the diameter as a key apparent grade factor. At the same time, growers should be trained to grade and should sell their tubers through their Cooperative Association. Using an official grade standard would ensure that the price growers receive would truly reflect the quality of potato tubers they sell.
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