Question: query regarding  sowing time and seed rate of black gram. 
Answer: sowing time- mid august-mid september. seed rate per bigha in case of line sowing- 2-3 kg and in case of broadcasting- 3-3.5 kg/bigha. before sowing please treat the seed with fungicide such as carboxin or maneb 2.5gm/kg seed or trichoderma viridi 10gm/kg of seed.