B S DILTAISHA DEV2023-11-182023-11-182023-09-22https://krishikosh.egranth.ac.in/handle/1/5810201472ABSTRACT The present investigation titled, “Studies on the effect of PGPR on growth, flowering, seed yield and quality of Antirrhinum majus L.” was carried out at the Khaltoo experimental farm of Department of Seed Science and Technology, Dr YS Parmar University of Horticulture and Forestry, Nauni, Solan (HP)-173 230 during 2022-23 to find a suitable PGPR treatment for obtaining better growth of plants, flowering and higher yield of better quality seeds in Antirrhinum majus L. The experiment comprised of 12 treatments namely, T1 (Uninoculated control), T2 (PGPR-I @5 ml/plant of 108 cfu/ml), T3 (PGPR-I @10 ml/plant of 108 cfu/ml), T4 (PGPR-I @15 ml/plant of 108 cfu/ml), T5 (PGPR-II @5 ml/plant of 109 cfu/ml), T6 (PGPR-II @10 ml/plant of 109 cfu/ml), T7 (PGPR-II @15 ml/plant of 109 cfu/ml), T8 (PGPR-I of 108 cfu/ml + PGPR-II @5 ml/plant 109), T9 (PGPR-I of 108 cfu/ml + PGPR-II @10 ml/plant of 109 cfu/ml), T10 (PGPR-I of 108 cfu/ml + PGPR-II @15 ml/plant of 109 cfu/ml) and T11 (Bioferganic liquid PGP – Plant growth promoter (BDC EXTRACT) @3 ml/l) all applied through drenching at 15 days intervals including T12 (RDF) was laid out in Randomized Complete Block Design with three replications. The better results in terms of plant growth, flowering behaviour as well as yield of good quality seeds were recorded in T10 (PGPRI of 108 cfu/ml + PGPR-II @15 ml/plant of 109 cfu/ml). The application of T10 in addition to enhancing the plant growth, flowering and production of quality seeds in higher amount have also contributed significantly in enriching the soil with huge load of beneficial bacteria, fungi and actinomycetes. Hence, the treatment T10 can be recommended for seed production of Antirrhinum majus L. on commercial scale after multilocation trials.EnglishThesis