In hydroponic vegetables,the $pH$ preferred by most vegetables is slightly

Deep black soil is considered to be highly productive due to high proportion of

The possible resource of phosphorus ions and nitrogen ions in soil generally get depleted because they are usually found as

In hydroponics,a chelating agent is used to

Which element is responsible for causing soil salinity? At what concentration does the soil become saline?

Aeroponics is also known as: