2020-08-072020-08-072006Egyptian Journal of Applied Science, 21(6): 12-221110-1571https://hdl.handle.net/20.500.12348/4289The purpose of the present study was to compare the effect of urea and calcium nitrate (c. nitrate) as nitrogen fertilizer sources with mono superphosphate (msp) on water quality and the performance of two species of tilapia (O. niloticus and O. aureus).pond cultureEffect of nitrogen fertilizer source on water quality and performance of two tilapia speciesJournal Article