Soil porosity is maximum in

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

Addition of a chelating agent to hydroponics is necessary for:

Which of the following herbicides is derived from urea?

Crop plants need various fertilizers for their growth. Their yield is limited by that fertilizer which is present in relatively minimum. The principle contained in this statement was enunciated by

Those fertilizers,which provide all the essential elements such as $N, P$ and $K$ etc. required for plant growth,are called