H.B. BabaladMuttanna2021-09-172021-09-172016-08https://krishikosh.egranth.ac.in/handle/1/5810175871A field experiment was conducted to study the “Green manuring practices and nitrogen levels on growth and yield of maize’’ at Main Agricultural Research Station, University of Agricultural Sciences, Dharwad, Karnataka on medium black soil under rainfed condition during kharif 2015-16. The experiment was laidout using simple RBD with thirteen treatment combinations replicated thrice. The treatments consisted ofsunnhemp and cowpea brown manuring with 100 %, 75 % and 50 % RDN and sunnhemp and cowpea green manuring with 100 %, 75 % and 50 % RDN.Sunnhemp recorded significantly higher phytomass (9.03 t ha-1) and biomass (1.30 t ha-1). Significantly highergrain weight per cob (128.4 and 126.5 g cob-1), grain number per cob (562.4 and 557.4), grain yield (5,758 and 5,624 kg ha-1) and stover yield (8.78 and 8.71 t ha-1)recorded with maize + sunnhemp (1:2) green manuring with 100 % and 75% RDN, respectively with intercultivation to partially mix green manure into soil as compared to RDF and were on par with each other. Dehydrogenase activity (5.94mg TPF/g of soil /day), N uptake (176.22 kg ha-1) and available nitrogen in soil (267.68 kg ha-1) recorded higher with maize + sunnhemp (1:2) green manuring with 100 % RDN with intercultivation to partially mix green manure into soil.Phosphatase activity (41.67 mg of PNP/g of soil/h)washigher with maize + cowpea (1:2) green manuring with 75 % RDN with intercultivation to partially mix green manure into soil.Brown manuring treatments recorded lower weed density as compared to RDFwhich recorded higher weed density (19 m-2) at 40 DAS. The economic analysis revealed that, significantly higher gross returns ( 85,883 ha-1) and net returns ( 49,763 ha-1) recordedwithmaize + sunnhemp (1:2) green manuring with 100% RDN with intercultivation to partially mix green manure into soil.EnglishThesis