Soil testing is strongly recommended to determine existing nutrient levels in the soil prior to fertilizer applications. Hemp has a large root capable of penetrating deep in the soil profile to recover nutrients that may be lost to many other crops; therefore, soil testing to the 24 inch level is recommended to identify possible nutrient reserves found lower in the soil profile.  

Hemp tap and fibrous roots

A soil test will give recommendations for additional nutrient requirements to achieve target yields. Until more research is completed in the area of fertility, follow the recommendation requirements for a high yielding, high protein wheat, corn or canola crop.