Effect of year-round planting on growth, flowering, seed production and Alternaria blight disease progression in African marigold (Tagetes erecta L.) cv. Punjab Gainda No 1
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Date
2023
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Punjab Agricultural University
Abstract
The present investigations entitled “Effect of year-round planting on growth, flowering, seed production and Alternaria blight disease progression in African marigold (Tagetes erecta L.) cv. Punjab Gainda No 1” were undertaken at research farm, Department of Floriculture and Landscaping, Punjab Agricultural University, Ludhiana, during 2021-23. In this study, three different experiments were conducted to investigate the effect of year-round transplanting on growth, flower, seed production and Alternaria blight disease progression. The seeds were sown on raised nursery beds during each month starting from January throughout the year. The seedlings were transplanted to the main field every month when they have achieved the transplantable height. Morphological parameters viz., plant height, plant spread, number of primary and secondary branches, bud diameter and bud length and yield traits: number of flowers per plant, flower diameter, weight of flower and flower yield per plant, chlorophyll spad value, number of seeds per flower and seed yield per plant were recorded highest in when crop was transplanted on 15th August followed by 15th July while maximum carotenoid content in flower was recorded when transplanting was done on 15th July. However, days taken for bud appearance, days taken for color break stage, number of days taken for full flower opening and days to seed harvesting were recorded earlier in crop transplanted on 15th October followed by 15th September. Seed quality parameters viz., 1000 seed weight, germination percentage, seedling vigour index -I and II, electrical conductivity, membrane leakage, dehydrogenase activity, total soluble sugars, total starch content, total soluble proteins, total free amino acids, amylase activity were obtained higher in seedlings transplanted on 15th August followed by 15th July. In third experiment disease incidence and severity both parameters were recorded higher in percent on 15th October transplanting and maximum area under disease progress curve (AUDPC) and higher apparent infection rate were also recorded when transplanting was done on 15th October followed by 15th September.
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Rakesh Kumar (2023). Effect of year-round planting on growth, flowering, seed production and Alternaria blight disease progression in African marigold (Tagetes erecta L.) cv. Punjab Gainda No 1 (Unpublished Ph.D. Dissertation). Punjab Agricultural University, Ludhiana, Punjab, India.