Nutrient uptake by crops is fastest during

Answer: Option C

Nutrient uptake by crops is fastest during Active growth.
Nutrient uptake by roots accounts for nearly all nutrient uptake under natural and cultivated conditions, but foliar uptake is important under some circumstances.
Nutrients are taken up by roots mainly as inorganic ions from the soil solution. The rate of uptake depends primarily on the concentration in the soil solution immediately adjacent to the root.
Soil water content is important because it affects root growth and nutrient transport to the root surface in both the water flux created by transpiration and the diffusive flux towards or away from the root.