In wheat total crop P uptake per ton of gram is about;________?

When FSL of the canal is sufficiently above the bed level of drainage so that canal flows under syphonis action, the structure is called ________?

Hitting the seed with force against a hard surface to break seed dormancy is called________?

The systematic arrangement of soil in to groups or categories is called________?

Aridisols cover the largest in Pakistan________?

A science which deals with classification of plants is called________?