Natural Fertilizer

About us

Creating Opportunity in the Nutrient Cycle

Sustainable

Innovative

Compliant

Reliable

Efficient

Impactful

Connected

Local

Regenerative

Nature designed a perfect system where nutrients flow continuously—from soil to crops to consumption and back to soil. Today, valuable organic nutrients from feedlots and food processors represent an untapped opportunity to enhance this natural cycle while creating value for everyone involved.

Natural Fertilizer connects these nutrient streams with farmers seeking to build healthier, more productive soil. We help feedlots and processors transform compliance requirements into revenue opportunities. We provide farmers with professionally managed natural fertility that complements their existing programs. And we strengthen Iowa's agricultural economy by keeping nutrients and value local.

Since 2007, we've been pioneering this win-win-win-win approach—helping Midwestern farmers enhance over 50,000 acres while creating jobs and building partnerships throughout the nutrient cycle. When we work together, organic resources become opportunities, compliance becomes profitable, and every participant benefits from a stronger, more sustainable agricultural system.

About the company

20+

Years

Rebuilding the Midwest's Soil Health

20+

Years

Rebuilding the Midwest's Soil Health

20+

Years

Rebuilding the Midwest's Soil Health

1000+

Partners

Our agricultural solutions are trusted by 1000+ partners and farmers

1000+

Partners

Our agricultural solutions are trusted by 1000+ partners and farmers

1000+

Partners

Our agricultural solutions are trusted by 1000+ partners and farmers

100k+

Acres

Using Natural Fertility

100k+

Acres

Using Natural Fertility

100k+

Acres

Using Natural Fertility

Completing the Nutrient Cycle

Choose your position in the nutrient cycle

Free Soil Consultation (For Farmers)

Submit your soil test data and talk with one of our experts.

Free Soil Consultation (For Farmers)

Submit your soil test data and talk with one of our experts.

Evaluate Your Resources (for Feedlots)

Send us your manure test and a member of our team will help you understand how much it is worth.

Evaluate Your Resources (for Feedlots)

Send us your manure test and a member of our team will help you understand how much it is worth.

Born & Raised Iowa Farmer

Born & Raised Iowa Farmer

Born & Raised Iowa Farmer

“Creating wins with the nutrient cycle means suppliers, buyers, the environment, and the economy all benefit — and if everyone wins, it’s impossible to fail.”

Abe

Sandquist

Meet our team

Testimonials

Hear from our partners

Onawa, Iowa — Farmer

“I have applied your gypsum product to my fields over the past seven years. I used to have to deep rip these fields to improve the aeration and reduce compaction. Now the soils are soft and I am no longer planning to rip them. This is going to be a cost savings in addition to all the other benefits.”

Waverly, Nebraska — Farmer

“This is the first ‘snake oil’ (jokingly) that I have found that really works. I first used it on my toughest soils and saw much improved yields. I thought I would then try it on some of my better soils and saw yields improve on them as well.”

Waverly, Nebraska — Farmer

“Some of my neighbors want to just apply PRO CAL to the alkali spots. I have found that I want to apply it to the whole field. The alkali area will benefit, but you also see yield benefits in the areas between the alkali spots.”

Mt. Vernon, Missouri — Farmer

“I applied 1000 pounds per acre to my grass pastures this year. I can honestly say that this was all I have done different. I graze my dairy cows on this grass. My dairy cow performance has vastly improved. My spring production was about 15#/day higher than in the past and production stayed higher longer into the summer. This summer I am still getting about 20#/day more than I have ever in the past. I have to truck this PRO CAL 40 a long ways, but I will definitely be using more this year.”

Onawa, Iowa — Farmer

"I used PRO CAL 40 on my river bottom ground this last fall. This is a Luton soil (heavy gumbo). This spring we had some 3 inch rains and where I applied PRO CAL 40 the water was gone in hours. The other ground had water standing on it for days."

Rogers, Nebraska — Farmer

"That PRO CAL 40 really wakes up my alfalfa. I was thinking about destroying my alfalfa before I applied PRO CAL 40. I don’t know how the stand improved so much. The yield was greatly improved as well."

Highland, Kansas — Farmer

"In the past my hillsides always turned yellow in August. This year after using PRO CAL 40 (1 ton/acre) on these hillsides only my neighbors hillsides are yellow. My fields are staying green."

Guthrie Center, Iowa — Farmer

"You have a great product in PRO CAL 40. I didn’t see much the first year I think because it was too dry, but after this year I am now a believer."

Testimonials

Hear from our partners

Onawa, Iowa — Farmer

“I have applied your gypsum product to my fields over the past seven years. I used to have to deep rip these fields to improve the aeration and reduce compaction. Now the soils are soft and I am no longer planning to rip them. This is going to be a cost savings in addition to all the other benefits.”

Waverly, Nebraska — Farmer

“This is the first ‘snake oil’ (jokingly) that I have found that really works. I first used it on my toughest soils and saw much improved yields. I thought I would then try it on some of my better soils and saw yields improve on them as well.”

Waverly, Nebraska — Farmer

“Some of my neighbors want to just apply PRO CAL to the alkali spots. I have found that I want to apply it to the whole field. The alkali area will benefit, but you also see yield benefits in the areas between the alkali spots.”

Mt. Vernon, Missouri — Farmer

“I applied 1000 pounds per acre to my grass pastures this year. I can honestly say that this was all I have done different. I graze my dairy cows on this grass. My dairy cow performance has vastly improved. My spring production was about 15#/day higher than in the past and production stayed higher longer into the summer. This summer I am still getting about 20#/day more than I have ever in the past. I have to truck this PRO CAL 40 a long ways, but I will definitely be using more this year.”

Onawa, Iowa — Farmer

"I used PRO CAL 40 on my river bottom ground this last fall. This is a Luton soil (heavy gumbo). This spring we had some 3 inch rains and where I applied PRO CAL 40 the water was gone in hours. The other ground had water standing on it for days."

Rogers, Nebraska — Farmer

"That PRO CAL 40 really wakes up my alfalfa. I was thinking about destroying my alfalfa before I applied PRO CAL 40. I don’t know how the stand improved so much. The yield was greatly improved as well."

Highland, Kansas — Farmer

"In the past my hillsides always turned yellow in August. This year after using PRO CAL 40 (1 ton/acre) on these hillsides only my neighbors hillsides are yellow. My fields are staying green."

Guthrie Center, Iowa — Farmer

"You have a great product in PRO CAL 40. I didn’t see much the first year I think because it was too dry, but after this year I am now a believer."

Testimonials

Hear from our partners

Onawa, Iowa — Farmer

“I have applied your gypsum product to my fields over the past seven years. I used to have to deep rip these fields to improve the aeration and reduce compaction. Now the soils are soft and I am no longer planning to rip them. This is going to be a cost savings in addition to all the other benefits.”

Completing the Nutrient Cycle.

Completing the Nutrient Cycle.

Farmers

Farmers

Farmers

Feedlots

Feedlots

Feedlots

About us

Creating Opportunity in the Nutrient Cycle

Sustainable

Innovative

Compliant

Reliable

Efficient

Impactful

Connected

Local

Regenerative

Years

Years

Years

Partners

Partners

Partners

Acres

Acres

Acres

Completing the Nutrient Cycle

Choose your position in the nutrient cycle

Free Soil Consultation (For Farmers)

Free Soil Consultation (For Farmers)

Evaluate Your Resources (for Feedlots)

Evaluate Your Resources (for Feedlots)

Abe

Sandquist

Testimonials

Hear from our partners

“This is the first ‘snake oil’ (jokingly) that I have found that really works. I first used it on my toughest soils and saw much improved yields. I thought I would then try it on some of my better soils and saw yields improve on them as well.”

“Some of my neighbors want to just apply PRO CAL to the alkali spots. I have found that I want to apply it to the whole field. The alkali area will benefit, but you also see yield benefits in the areas between the alkali spots.”

"I used PRO CAL 40 on my river bottom ground this last fall. This is a Luton soil (heavy gumbo). This spring we had some 3 inch rains and where I applied PRO CAL 40 the water was gone in hours. The other ground had water standing on it for days."

"That PRO CAL 40 really wakes up my alfalfa. I was thinking about destroying my alfalfa before I applied PRO CAL 40. I don’t know how the stand improved so much. The yield was greatly improved as well."

"In the past my hillsides always turned yellow in August. This year after using PRO CAL 40 (1 ton/acre) on these hillsides only my neighbors hillsides are yellow. My fields are staying green."

"You have a great product in PRO CAL 40. I didn’t see much the first year I think because it was too dry, but after this year I am now a believer."

Testimonials

Hear from our partners

“This is the first ‘snake oil’ (jokingly) that I have found that really works. I first used it on my toughest soils and saw much improved yields. I thought I would then try it on some of my better soils and saw yields improve on them as well.”

“Some of my neighbors want to just apply PRO CAL to the alkali spots. I have found that I want to apply it to the whole field. The alkali area will benefit, but you also see yield benefits in the areas between the alkali spots.”

"I used PRO CAL 40 on my river bottom ground this last fall. This is a Luton soil (heavy gumbo). This spring we had some 3 inch rains and where I applied PRO CAL 40 the water was gone in hours. The other ground had water standing on it for days."

"That PRO CAL 40 really wakes up my alfalfa. I was thinking about destroying my alfalfa before I applied PRO CAL 40. I don’t know how the stand improved so much. The yield was greatly improved as well."

"In the past my hillsides always turned yellow in August. This year after using PRO CAL 40 (1 ton/acre) on these hillsides only my neighbors hillsides are yellow. My fields are staying green."

"You have a great product in PRO CAL 40. I didn’t see much the first year I think because it was too dry, but after this year I am now a believer."

Testimonials

Hear from our partners