Author(s):

Kamlesh Meena, MK Kaushik, Arvind Verma and Deen Dayal Bairwa

Abstract: A field experiment was conducted on clayey loam soil at Udaipur (Rajasthan) during kharif season of 2019-20 to study the effect of fertility levels on growth and yield of Sweet Sorghum [Sorghum bicolor (L). Moench]. The experimental results revealed that significant variation was recorded in plant height, leaf area index and dry matter accumulation plant^-1 at various growth stages of sorghum with different genotypes. With respect to plant height, SPV 2530 attained significantly higher plant height at 30, 60 DAS and harvest compare to the CSV 19SS and CSV 24SS genotypes. Further, SPV 2530 proved to be significantly superior in terms of leaf area index over rest of the both of the genotypes at 30 and 60 DAS. Therefore, dry matter accumulation plant^-1 at 30, 60 DAS and at harvest observed significantly higher in CSV 19SS compare to the rest of the genotypes. In respect to the fertility levels, application of 125% RDF (80 kg N + 40 kg P₂O₅ + 40 kg K₂O ha^-1) recorded significant maximum plant height at 30 DAS, 60 DAS and at harvest (107.28 cm, 237.06 cm and 360.28 cm, respectively). Application of 125% RDF observed significantly higher leaf area index by 41.5 and 16.45 per cent over 75% and 100% RDF respectively. Dry matter accumulations highest observed with 125% RDF at 30 DAS, 60 DAS and at harvest (11.20, 96.58 and 158.11 g plant^-1) and data indicate that CSV 24SS observed significantly higher grain yield (4831 kg ha^-1) as compared to CSV 19SS (4374 kg ha^-1) and SPV 2530 (4482 kg ha^-1) and genotypes CSV 19SS observed the maximum stover yield (12721 kg ha^-1), which was significantly superior over rest of the genotypes except that of CSV 24SS (11054 kg ha^-1) and SPV 2530 (12471 kg ha^-1). Yield attributes in respect to the fertility levels application of 125% RDF significantly increase stover yield to the tune of 7.26 and 2.33% over 75% and 100% RDF respectively.

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