Patil, F.B.Sonone, Arvind L.2018-07-302018-07-301987http://krishikosh.egranth.ac.in/handle/1/5810062603The present investigations were under taken with a view to (i) study the effect of different growth substances (Planofix and TI3A) on vegetative growth and seed yield of lucerne (Medicago sativa T.:)( ii) maximise the seed yield using TIBA and Planofix at proper stage of growth. The second experiment with first year, second year and third year crop seed was conducted seed to decide the period (i.e. year) for lucerne/production. In the first experimentytwo chemicals viz./Planofix and TIBA with three concentrations (5o ppm, 100 ppm and 150 ppm) were sprayed before flowering (S^ and during flowering (S ). The observations on seven different plant characters and six seed characters were recorded. The studies revealed that the means for different treatment combinations including absolute control, differed significantly for all the characters except plant height, weight of husk, seed density, seed volume and seed moisture. The highest seed yield per hectare was recorded with 50 ppm of TIBA sprayed at flowering (S2) which was followed by the its spray before flowering (S^ recording 62.80 and 55.68 per cent increase in seed yield respectively over the control. the In/c-ase of Planofix, the concentration of 150 ppm was found better. Number of tillers per m2 with the sprays of growth substances used were statisticaly more than the control. Germination percentage was improved with the sprays of Planofix and TIBA. The harvest and vigour indices were also improved significantly. Thousand seed weight was maximum with Planofix sprayed at flowering. In case of laboratory experiment conducted with first year, second year and third year crop seed, the germination was recorded three times at an interval of a month. It was higher and significantly more in the case of seed produced from third year crop and gradually reduced as the period /harvest was enhanced. Thousand seed weight from third year crop was also higher as compared to the same from first and second year crop. The differences in seed density, seed volume and seed moisture due to different year crop seed, were not significant. In the case of vigour index, same trend was noted as observed in respect of germination percentage. Third year seed with better germination and vigour index, higher lOOO seed weight and seed volume and low seed moisture and density thus, proved its superiority in respect of seed parameters.ennullThesis