Excessive depletion and recovery of soil water

rate of recovery of capital

rate of recovery of capital construction

rate of recovery of floatation

Recovery of fertility

artificial fertility of soil

Contribution of soil fertility

Decline of soil fertility

eco-relativity of soil fertility

effect of water and fertility of soil

Evaluation of fertility of phosphorus

evaluation of soil fertility

fertility of soil

improvement of soil fertility

increasing of soil fertility

inexhaustible fertility of soil

inhibiting facctors of soil fertility

Limiting factors of soil fertility

maintenance of soil fertility