Physiological response, yield and quality of GO potato (Solanum tuberosum) seed yield to various concentrations and time of application of prohexadione-ca bioregulator

Potato cultivation on the surface of the media faces obstacles in the form of high temperatures which cause the biosynthesis of gibberellins to increase and disrupt the tuberization process of potatoes. The use of hormonal engineering that can be done to increase the quantity and quality of G0 potato seeds is the use of retardant or anti-gibberellin Prohexadione-Ca with the right concentration and time of application. The experiment was carried out from June 2021 to February 2022 at Screen House, Ciparanje Jatinangor Experimental Garden, and Hortiklutura Laboratory, Faculty of Agriculture, Padjadjaran University. This experiment factorial randomized block design consisting of two factors., concentration of Prohexadione-Ca which includes three levels (50, 100, and 150 ppm) application time of Prohexadione-Ca (30, 40, and 50 days after planting). The experimental results showed that there was an independent effect between the dose and time of application of Prohexadione-Ca on the physiological components, yield, and quality of results. The dose of Prohexadione-Ca 50 ppm independently gave the best effect on the chlorophyll content index and stomatal conductance. The time of application of Prohexadione-Ca 40 days after planting independently gave the best effect on the number of potatoes per plant, potato weight per plant, and shoot length.