Question: asking about nursery bed preparation. 
Answer: before 4 days of sowing you have to spray any one of the following fungicide like indofil m 45/saaf/ redomill gold 3 gram/liter of water and cover it for 2 days. on the 3rd day you have to remove the cover and then have to spray one insecticide like neem oil 5ml/liter or decis/ rocket 2ml/liter of water. on the next day you have to treat the seed with any one of the above mention fungicide and show it into the bed. sprinkle water over it. make a rain and sun protective roof above it.