??? ???? ??? ??????? ?? ????? ??? ????? ? ??????­??? ???? ???? ? ??? ?? ????? ???? ?? ???? ??????? ?????? ???????? ??????? ? ???????­?? ?? ???? ??­???.Rainwater is a good selection for hydroponics as you won't have to worry about the initial salt concentration, and it could be gathered from greenhouse roofs.Phosphorus is crucial for the event of