Contact Us


Contact Us

Humboldt Ag Supply can help you grow. Get in touch to schedule your soil test, set up an account, or explore our products.



dry amendments icon

Dry Amendments

soil conditioners icon

Soil Conditioners

soluble powders icon

Soluble Powders

liquid nutrients icon

Liquid Nutrients

beneficial biology icon

Beneficial Biology

X Dry Amendments icon

Dry Amendments

Apply the right dry product at the right time to improve or repair soil.

Alfalfa Meal 2-0.52-2
Bat Guano 0-7-0
Bat Guano 9-3-1
Blood Meal 12-0-0
Bone Meal
Calcitic Limestone
Crab Shell 4-4-0
Epsom Salt
Feather Meal
Fishbone Meal
Glacial Rock Dust
Kelp Meal
Leafy Green Special 7-1-2 OMRI, OIM

Certified organic soy bean derivative — fast to medium nitrogen release.

Micro Algae Meal

Cultured in brewery wastewater; recover nutrients stripped during wastewater treatment.

Neem Seed Meal 5-1-2

Feed soil microbes with a medium nitrogen release rate.

Oyster Shell Flour
Palm Bunch Ash 0-0-15
Paramagnetic Rock Dust

Granite dust with magnetite encourages electromagnetic current in roots.

Salinas Veggie Mix 8-4-4 WSDA Organic, OIM
Seabird Guano 0-11-0
Seabird Guano 2-6-0
Seabird Guano Pelletized 12-12-2.5
Shrimp Shell 6-6-0
Steamed Bone Meal 1-12-0
Sulfate of Potash
Sulfate of Potash 0-0-50

Lorem ipsum dolor sit amet, consectetur adipiscing elit.

X soil conditioners icon

Soil Conditioners

Ensure long-term soil health by grooming with a selection of conditioners.

Chicken Manure
Dairy Compost
Fibergro Shredded Yucca
Lava Rock
Mt Mazama Pumice

Crater Lake volcanic material holds water and nutrients while increasing soil porosity.

Mushroom Compost
Royal Gold Worm Castings
X soluble powders icon

Soluble Powders

Fast-acting source of nutrients and growth stimulators.

Full Mineral Fulvic Powder
Humic Acid Powder 58.5%
Kelp Powder 1-0-18
Nitro Soy Blast 12.9-0-0 Amino Powder
Soluble Micronutrients
Yucca Powder
X liquid nutrients icon

Liquid Nutrients

Instant nutrient delivery for quick boosts to soil vitality and plant production.

Eco-Hydro Fish 1.5-3-0.2 OMRI, OIM, WSDA Approved
Eco-Hydro Shrimp 0-7-0
Eco-Nereo Kelp OMRI, OIM, WSDA Organic
Fish Concentrate 4-2-0
Fish Hydrolysate 2-5-0.2
Molasses 0-0-2 OMRI, OIM
Phyta-Cal QC WSDA Organic, OIM
Phyta-Set QC WSDA Organic, OIM

Calcium and boron organic foliar spray delivers nutrients immediately.

Phytamin All Purpose 4-3-4 OMRI, OIM
Phytamin Clear 4-0.3-1 OMRI, OIM
Phytamin Fish 3-2-0 OMRI, OIM
Phytamin Gold 5-1-2 OMRI, OIM

Liquid fish hydrolysate offers fast nitrogen application for microbial growth.

Plant Extract 3-2-2
Tappin' Roots 4 in 1 Plant Tonic
X beneficial biology icon

Beneficial Biology

Strengthen roots and enhance nutrient performance with microbe application.

Mycoapply Endo and Ecto Mycorrhizae
Soluble Bacillus Blend
Navigation down Navigation up

Featured Partners

Humboldt Ag Supply is proud to offer fertilizers and growing materials from top producers like:

Navigation up

Make it a
Humboldt day

Barometric Pressure

On the Ground

Prep your starts early to beat the spring rush. Once your greenhouse is at capacity, identify and implement a pest management strategy that will keep your garden happy and healthy.