ASHOKA RANI, YAKSHATA2020-02-282020-02-282019http://krishikosh.egranth.ac.in/handle/1/5810143879D5914A field experiment entitled “Source and sink studies in Blackgram (Vigna mungo (L.) Hepper) influenced by PGRs, major and minor nutrients.” was conducted at Agricultural College Farm, Bapatla during kharif 2018 in randomized block design with ten treatments viz., foliar application of GA @ 50 ppm (T1), 6BA @ 20ppm (T2), SA @ 100ppm (T3), NPK (19:19:19) @ 2% (T4), MAP@ 2% (T5), ZnSO4 @ 0.5% (T6), Boron @ 0.1% (T7), Hoagland nutrient solution (full strength) (T8),Water spray (T9) and Control (T10) in three replications. Foliar spray of HNS increased the branch number by 42.2 percent followed by Boron (33.7%) and SA (32.5%) sprays over control. The increase in source size with HNS over control was 53.3 percent followed by NPK (30.7%). Sprays of Boron and HNS enhanced the chlorophyll ‘a’ by 1.7 and 1.6 times, Application of nutrients as a mixture caused remarkable increase in chlorophyll ‘b’ (40.2 %). Total chlorophyll was found high in HNS (49.9%) followed by boron (45.6%) and zinc (32.4%). Root, stem, leaf and pod biomass was found increased with Hoagland nutrient solution. Total dry matter was resulted high with sprays of HNS followed by NPK and MAP. Sprays of HNS, Zn and boron caused increase in source activity by 2.38, 2.15 and 2.03 folds and decreased the transpiration rate by 2.04, 1.84 and 1.73 folds. Foliar application of PGRs and nutrients resulted in rise of internal CO2 concentration through increase in stomatal conductance. The magnitude of increase was found high with HNS followed by boron and ZnSO4sprays. Nitrate reductase activity was found high (2.4 folds) in HNS treated plants. A greater impact on protein content in seed was observed with sprays of HNS (38.0%) followed by boron (27.1%).Sprays of HNS enhanced the starch content (62.2%) followed by Boron (50%), SA (47.2%), Zn (42.5%) and GA (41.4) respectively. SPS xiv activity was stimulated to a great extent with HNS (54.2%) and BA (50 %) followed by Zn (37.5%). The invertase activity was found high with HNS and GA sprays (2.8 and 2.7 folds, respectively). The sprays of HNS and MAP increased the sink number (pods) by 42.8 and 35.8 per cent, respectively. Use of PGRs, macro and micro nutrients has resulted in production of longer pods. It was found high with HNS (16.2%). HNS increased the sink strength by 74.5%, followed by NPK (46.5%), Zn (41.6%), and MAP (40.1%). The increase in seed number was more in T4 and T8, which showed 1.5 and 1.2 folds increase, respectively. There was no remarkable effect on 100 seed weight. The maximum increase in yield over control was observed with application of Hoagland nutrient solution (38.8%) and boron (26.2%) whereas Harvest index was found maximum in HNS (T8) treated plants followed by boron (T7) and SA (T3) sprays.en-USnullThesis