Abstract
The experimentation entitled, “Studies on different growth regulators and stage of application on inflorescence induction and development of pineapple (Ananas comosus L. Merr.) Var. Queen” was carried out at the Agri-technology Park, Birsa Agricultural University, Kanke, Ranchi during 2017-2020. The experiment was laid out in factorial randomized block design with two factors i.e. factor A- growth regulators (G) and factor B- stage of application (S). These factors consist of twelve and three levels respectively, thirty six treatment combinations with three replications. The experiment was conducted on pineapple plants of Queen Variety. The growth regulators i.e. NAA 10ppm (G1), NAA 20ppm (G2), Ethrel 10ppm (G3), Ethrel 30ppm (G4), Ethrel 50ppm (G5), NAA 10ppm + Ethrel 10ppm (G6), NAA 10ppm + Ethrel 30ppm (G7), NAA 10ppm + Ethrel 50ppm (G8), NAA 20ppm + Ethrel 10ppm (G9), NAA 20ppm + Ethrel 30ppm (G10), NAA 20ppm + Ethrel 50ppm (G11) and Control (G12) by foliar application were applied at 30,35 and 40 leaves stage. Among the different treatment combination the treatment G4S3 (Ethrel 30ppm at 40 leaves stage) noted the minimum days taken for completion of flowering and days required for fruit maturity.
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