Which soil type has the highest water-holding capacity?

Factors which determine to a large extent the vegetation of any area are:
$I.$ $pH$ of soil
$II.$ Mineral composition of the soil
$III.$ Water holding capacity of soil
$IV.$ Weather condition
Choose the correct option.

Any mineral ion concentration in tissues that reduces the dry weight of tissues by $10$ percent is considered toxic.

Edaphology is the study of the relationship between:

Solubility and availability of plant nutrients are more related to

Magnesium is mainly present in the form of