International Journal of Horticulture, 2024, Vol.14, No.6, 333-342 http://hortherbpublisher.com/index.php/ijh 335 2.3 Cultivation practices Fertilizer applied was FYM 30 t/ha, Urea 132.3 kg/ha, DAP 217.4 kg/ha, and MOP 100 kg/ha. Urea was applied in split dose half during planting and other half during first earthing up when plant reaches the height of 15 cm. Total experimental area was 95.7 m2. 2.4 Parameters recorded Growth parameters, including plant height (cm), number of leaves per plant, number of stems per hill, and canopy diameter (cm) at various days after planting, were measured. Additionally, yield parameters such as tuber weight per plant (g), tuber number per plant, marketable tuber (kg/m2), Unmarketable tuber (kg/m2) and tuber distribution by grading in terms of number and weight were recorded. Data analysis was done using MS-Excel and R-Studio. 2.5 Disease scoring of potato wart Potato tubers were harvested manually, and the disease severity was evaluated based on the EPPO Diagnostic Protocol (EPPO, 2004), which classifies symptoms into nine distinct classes depending on the extent of wart proliferation observed on the tubers (Table 2). Table 2 Classification of disease severity in potato cultivars based on wart proliferation Class Reaction of potato cultivar 1 Tubers not affected 2 Single Proliferation (<5 mm) 3 2 or 3 proliferations (<5 mm) or a single large proliferation (5-10 mm) 4 Several large warts (5-10 mm) 5 Several medium-sized warts (>10 mm) 6 Several large warts, at least one of these being>10 mm, and beginning deformation of the tuber 7 Large warts with a diameter of >10 mm and disruption of tuber formation 8 Very large warts, but individual tubers still recognizable 9 Very large warts, no normal tubers present The disease severity was evaluated for each individual plant separately, according to the size and number of the warts. The final score was considered to be the category ⁄ class which predominated among the plants with symptoms. For example, if from 10 plants, five plants were not affected (class 1); two were in class 4; and three in class 5, then the final score was written down as ‘5’ (Table 2). 3 Results and Analysis 3.1 Potato plant height (cm) The effect of different varieties on plant height was significant (Table 3). At 45 DAS maximum plant height was obtained in Janakdev (27.95 cm) and minimum height was recorded from Myagdi local (23.18 cm) which was at par with Kufri Jyoti (Figure 2). Similarly, at 60 DAS maximum height was recorded from Janakdev (47.61 cm) and minimum height was recorded from Desiree (32.24 cm). Similarly at 75 DAS maximum height was recorded from Janakdev (59.79 cm) which was at par with Myagdi local and minimum height was recorded from Desiree (42.19 cm). Similarly at 90 DAS highest plant height was recorded from Janakdev (66.00 cm) which was at par with Myagdi local and lowest plant height was recorded from Desiree (47.50 cm). The CV shows highest variability of plant height at 75 DAS and lowest at 45 DAS. 3.2 Number of stems per hill The effect of varieties on number of main stems per hill was significant (Table 4). At 45 DAS maximum number of stem per hill was recorded in Desiree (3.80) which was at par with Janakdev. Similarly at 60 DAS maximum number of stem per hill was recorded in Desiree which was at par with Janakdev and Kufri Jyoti and minimum number of stem per hill was recorded in Myagdi local (2.73) which was at par with Mustang local. At 75 DAS maximum number of stems per hill was recorded on Desiree (5.53) and minimum number of stem per hill was recorded on Myagdi local (3.50) which was at par with Mustang local and Kufri Jyoti. The CV shows higher variability of stem numbers per hill at 45 DAS and lowest variability at 60 DAS.
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