Effect of two plant growth regulators on the yield and quality of russet burbank potatoes Summary
Foliar applications of ethephon (ETH) 300 g a.i. ha
−1; chlormequat chloride (CCC) 920 g a.i. ha −1, with a second application of 230 g a.i. ha −1 approximately 2 weeks later; and a mixture of the two (ETH/CCC) 156 g a.i. ethephon and 299 g a.i. chlormequat chloride ha −1 were made to field-grown Russet Burbank potatoes in 1986, 1987 and 1989. All the treatments increased the number of tubers set and reduced the average tuber weight compared to the control resulting in a reduction in premium and marketable tubers, and an increase in small tubers. Differences were greatest for ETH and least for CCC. ETH and ETH/CCC decreased the specific gravity, increased the incidence of deformities, and decreased the incidence of tubers with hollow heart. The growth regulators did not affect fry colour. Additional keywords Solanum tubersoum L. ethephon 2-chloroethylphosphonic acid chlormequat chloride CCC 2-chloroethyltrimethylammonium chloride References
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