Survey on Modulation Pattern and Mineral Nitrogen Levels in Rice fallow Black gram Areas in Guntur District

摘要

A survey was conducted to study the nodulation pattern and mineral nitrogen levels in the soils of rice-fallow blackgram growing areas in Guntur district. The study indicated a wide variation in blackgram nodulation depending on diffeerent soil conditions. Number of nodules per plant varied from 4.0-23.75 and the dry weight of nodules ranged from 7.0-76.0 mg per plant. Mineral nitrogen in soils ranged from 63.7 to 91.0 ppm and was found to be high at flowering stage compared to harvestign stage.