REHABILITATION OF FROSTED POTATO CROP THROUGH PLANT GROWTH REGULATORS
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AbstractFrost incidence in Indo-Gangetic plains is often, unpredictable and causes moderate to heavy yield losses in potato. However, there is no technology in place for rehabilitation of the frosted crop. An attempt was, therefore, made to mitigate the freezing damage in a sixty days crop having 60-70% foliar destruction and to capitalize on subsequent favourable weather. GA3 was chosen to promote the re-growth of leaf and stem and cycocel to check the excess growth of foliage for diversion of photosynthates into the tubers. After one week, foliar spray of gibberellic acid (50, 100, 150 and 200 ppm, GA3) alone or in combination with 125 ppm cycocel (3 weeks after frost) were evaluated in RBD with four replications. Observations on morphophysiological parameters indicated that 100 ppm dose of GA3 increased leaf area to a maximum (2368 cm2) in comparison to other treatments including control (1455 cm2) and maintained the density of photosynthetic pigments (chlorophyll a/b ratio: 1.67) at par with control. Similarly, the dry weights were significantly higher in stem (6.8 g plant-1), leaf (11.1 g) and entire plant (38.6 g) with 100 ppm dose of GA3 as against unsprayed control (23.4 g plant-1). Tuber length was also increased progressively with the increase in GA3 concentrations but was reduced when GA3 was combined with cycocel. Regarding yields, the spray of 100 ppm GA3 and 125 ppm cycocel produced maximum tuber yields (9.16 kg plot-1 , plot: 3.0m2), followed by GA3 alone (8.04 kg plot-1), which were significantly higher than unsprayed control (6.89 kg plot-1). The finding needs to be exploited in framing strategies for rehabilitating the frost annihilated potato crop so as to restore productivity and farm profits.
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Kumar, D., Singh, B. P., Rawal, S., Minhas, J. S., & Pandey, S. K. (2013). REHABILITATION OF FROSTED POTATO CROP THROUGH PLANT GROWTH REGULATORS. Potato Journal, 38(1). Retrieved from https://epubs.icar.org.in/index.php/PotatoJ/article/view/32441