Practices: No-till, animal integration, alley cropping, poly cropping, composting, and cover cropping
Nathanael Siemens is an organic grower juggling a variety of crops, fields, and systems across California. He has a 150 acre farm in Modoc County and another 10 acres in Kern County. He is also working at the Rodale Institute's new farm research center in Ventura County.
He grew up on a farm in Kern County but left for college and only returned to farming 15 years ago. When he first got back into farming, he was doing management for other growers and didn't have the capacity to change up existing practices. Later on, he was hesitant to make big changes since the conventional system was already functioning.
This all changed during the recent drought, when it became clear to Nathanael that conventional farming was no longer viable. He started thinking outside the box by doing dry farming and implementing practices that build up organic matter. He also started planting multiple crops at once so that they don't all fail at the same time.
In Modoc, Nathanael dry farms grain crops. Dry farming is common in that area, but he also does no-till on this farm, which is less popular. He's also begun planting trees in the grain fields as part of an alley cropping system. He brings sheep onto the fields to graze after harvest.
In Buttonwillow, on the western side of Kern County,Nathanael grows grains, along with cotton and corn. He tried poly cropping, where he planted a wide variety of grains all together in one field. He reported that this was a fun practice, but he ended up only being able to sell about 5% of the product since the market for organic mixed grains hasn't materialized yet. He used the rest of the harvest for animal feed. He planted this mix of grains to reduce the likelihood of total crop failure. He tried doing reduced till in his cotton field here last year, but it didn't work out very well because of intense weed pressure. For this reason, he's scaling this experiment down to just 2 acres this year. The rest of the field is in corn. He hasn't transitioned to a no-till system for his corn yet, since this practice is more popular and thus less exciting to try out.
He implements a wide variety of conservation practices, but didn't start them all at the same time. The first practice he implemented was cover crops, 5 years ago. Then he started transitioning to no-till 4 years ago. He started planting poly crops 3 years ago, incorporated sheep into his systems 2 years ago, and started spreading compost one year ago.
Nathanael has seen an instant yield increase after implementing poly cropping. It has been harder to see the immediate effects on yield of compost and cover cropping.
He sells most of his grain at farmers' markets. This niche market supports farmers who have an interesting or compelling narrative. Farmers' market customers will pay a higher price for dry farmed crops.
Poly cropping/intercropping cotton has encouraged more biodiversity. In Buttonwillow, in Kern County, he has noticed a huge difference between his field and his neighbors' fields. There are more beneficial insects and birds in his field. Last year, his cotton suffered no insect damage.
These practices, especially cover cropping and no till, have led to a noticeable decrease in wind erosion. This helps to improve the local air quality.
In Modoc, Nathanael has seen a positive impact of these practices on his dry farmed grains. Wherever there is more mulch on the surface because of his no-till and poly cropping practices, he has noticed that there is more water in the soil. The crops therefore stay green longer.
As already mentioned, the reduced till regimen for cotton didn't work out last year because the cotton was overwhelmed by weeds.
However, Nathanael has seen in his grain fields in Modoc that no till has reduced weed problems after the first year. The first year of no till there was difficult, but once the mulch layer gets established, it keeps weed seeds from germinating, especially the annual weeds that normally take over disturbed soils.
Once Nathanael started bringing in sheep to graze his fields, he gained an extra income stream. This practice brings in additional revenue but only requires minimal additional inputs.
Overall, he said that these practices have helped the farm's bottom line. It's hard to determine the exact dollar amount because it has been a total lifestyle change. Instead of spending hours on a tractor, he's now spending that time talking to customers and managing animals.
Nathanael explained that there has been a steep learning curve in implementing these practices and that he is still on the steep part of that curve, especially for animal management. As he's found with his poly cropped grains, marketing his products has been a challenge. However, the farm has managed to find good opportunities to sell their niche products to people willing to pay for them.
He would recommend these practices to other growers. He would advise reaching out to consultants and other resources to learn from experts. Also, he learned that it is easier and more efficient to contract out instead of doing everything himself. This has been especially true with the sheep grazing, since he had not dealt with sheep before. He also pointed out that many regenerative practices aren't new, they're just not generally paired together like he's been doing.
He would advise trying a practice out on a few acres and seeing the results for yourself.
Steven Lee, PhD, has worked as the farm manager for Quaker Oaks Farm in Visalia, CA for the past 5 years. This 22-acre nonprofit educational center includes 8 acres of native wetlands, 2 acres of organic mixed vegetable crops, and 1 acre of organic stone fruit and Asian pears.
Steven has been working in agriculture for about 20 years, both in the lab and in the field. In 2017, he applied for the first round of Healthy Soils funding to implement a wide variety of conservation practices. The farm already did reduced tillage, but they used HSP funds to offset the costs of buying compost, planting cover crops, spreading mulch, and installing hedgerows.
He started these practices to improve the health of the soil and benefit the local ecosystem.
For the orchard, Steven has followed the following schedule:
In the spring, he mows down the cover crops and then applies compost. He spreads wood chips on top of the compost. The mulch has not yet caused a nitrogen deficiency in the fruit trees because it stays on top of the soil and is not thoroughly mixed in. In the fall, he disks the mulch in lightly and seeds the cover crops right before a rain. The cover crop mix he planted last year included triticale, vetch, bell beans, and field peas. However, he prefers planting oats over triticale.
In the vegetable cropping area, he follows a different procedure:
He drives up to Williams, CA in the fall to procure organic straw to maintain the farm's organic certification. He then spreads the straw mulch in the area between the vegetable beds. He found that rice straw was too clumpy to spread easily and thus prefers more traditional oat or wheat straw. He then seeds the cover crops into the mulch. The mulch improves cover crop seed germination, as it provides both moisture and protection from hungry birds. After disking in the cover crops in the spring, he plants his vegetable crops.
In just the past 3 years of doing these practices, the soil organic matter has increased from 1% to 2%. However, the soil pH has also gone up from 7 to 7.5. At some point, the increase in organic matter should help buffer and stabilize the soil.
The total yield has decreased because of the difficulty of incorporating cover crops into the vegetable system schedule. Cover crops and mulch require more work and effort to implement, and Steven and his team of volunteers couldn't get everything done in time. However, for him, the long-term ecological benefits are more important than a season or two of reduced yields.
The cover crops and hedgerows have led to increased insect diversity. There are more beneficial insects like ladybugs, green lacewings, assassin bugs, praying mantis, along with more pollinators like bees and hoverflies than there were a couple years ago.
However, there are also more ground squirrels, rabbits, and gophers. There are birds of prey and snakes, but not enough – the cover crops offer cover and protection for these pests.
The mulch between the vegetable beds has reduced dust emissions, which makes working in the vegetable beds easier.
In both the trees and the vegetable crops, the mulch and compost keeps the soil moist. Steven has only watered the young fruit trees 3 times this year using furrow irrigation and has not seen any ill effects on tree health.
He has reduced his irrigation frequency on his vegetable crops from every other day to once a week. He estimates that he is now using about half the water he was applying before, but still has plenty of produce.
Steven doesn't need to buy expensive organic blood meal anymore because the cover crops and compost provide enough nutrition. The long-term stabilization of soil productivity through the implementation of these practices should lead to resilience.
One of the difficulties he's had is that the timing for the Healthy Soils Program doesn't always match up with what makes the most sense for vegetable production. He had to skip a whole cycle to plant cover crops, which ended up costing the farm money.
He would recommend implementing these practices if they fit into your system. If you're interested in trying one of these practices, his advice is to keep it simple.
He is cautious about recommending straw mulch in vegetable crops, because he found it to be time-consuming and not cost effective. The biggest benefit for the straw mulch was that it improved cover crop germination. Spreading wood chips on the orchard floor was easier and so he would recommend that more than he would recommend the straw mulch.
His highest praise was for the hedgerows. He pointed out that you can plant herbs like rosemary, oregano, or sage, which would allow you to both sell a product and promote biodiversity.
Looking back over the past 3 years, he would improve his implementation of these practices by simplifying and not overcommitting himself. He had better results when he seeded the cover crops between the vegetable beds instead of on the beds themselves.
He would also like to try further reducing tillage and using a roller crimper. This would turn the terminated cover crops into mulch. That way, he wouldn't need to import mulch from another farm.
He's also interested in doing multiple plantings of cover crops, now that the farm has finished its Healthy Soils project and thus will have more flexibility with its scheduling. For example, planting buckwheat, which grows so fast that it can evade drought and attracts beneficial insects.
- Author: Dana Brady
In Spring 2019, one of the owners from Alves Dairy reached out about applying for an Alternative Manure Management Program (AMMP) grant through CDFA. Only one other project like this in the area exists, so tackling this sort of large-scale manure management project was exciting!
The CDFA AMMP Program provides financial assistance for the implementation of manure management practices in California, which will result in reduced greenhouse gas emissions. This grant program is open to all livestock operations, although dairies are the most common applicants. A total of 58 projects have been funded since the grant program started in 2017, resulting in 716,800 metric tons of carbon dioxide equivalents reduced in 5 years. These projects can fall under four general categories, pasture-based management, solid separation, alternative manure treatment and storage, and conversion from flush to scrape.
The Alves Family started their Dairy in the 1920's and have sustained their operation in the county ever since. The four brothers, Greg, Rich, Gary and Mike, and the next generation, Chris and Scott, share responsibilities for the operation, where they have game birds, corn, alfalfa, orchards and their dairy, with each partner taking on a role to make the whole farm run smoothly. The family is very involved in the community and support local projects and organizations as well.
The Alves originally came to UCCE with this idea because they wanted to improve manure management practices on the dairy and reduce their overall methane emissions. Greg, one of the brothers and owners, spent a large part of his time cleaning manure from the lagoons, taking time away from other important projects on the dairy. With this in mind, we constructed a plan to hopefully make his life, and others on the dairy, a lot easier and achieve significant environmental benefits.
The Alves applied under the solid separation category to install a manure separator, a concrete slab and walls, and a new pump that would replace an old diesel pump. The separator filtered out the manure solids, resulting in nutrient rich solid manure to be spread onto fields and reduce the amount of time the solids spend in anaerobic lagoons, creating methane gases. This project will also reduce a substantial amount of greenhouse gases due to not needing to use the excavator to move manure around, or as many truck loads to export the material.
On January 1, 2020, the project started and the Alves hit the ground running. All of the partners contributed their own time and energy to this project to make it such a success. Over the past six months, the Alves completely finished their project a year ahead of schedule, and have just recently completed their final verification with CDFA. The verification was done remotely this year and consisted of a Zoom call with Greg to answer some questions, talk about his experience and show off his finished project.
Greg has already seen the both environmental and personal benefits from the separator project and hopes to continue making the dairy more sustainable in the future.
Congrats! You've been awarded a grant from the California Department of Food and Agriculture's Healthy Soils Program. Now what?
Once your grant has been executed and before you implement any of your practices, you need to take soil samples to measure the soil's baseline organic matter content. You will need to take soil samples 3 times over the course of your project. You should take the soil samples at the same time of the year every year. You should not take soil samples right after major rain events or right after you've applied soil amendments like manure.
How do you take soil samples? Here's the CDFA's protocol:
First of all, here's what you need to bring to the field:
- Plastic buckets
- Soil sample bags or one-gallon freezer storage bags (one bag per sample)
- Clipboard and papers for recording
- Permanent marker
- Straight shovel or soil probe
Where should you take your samples?
You should check your grant agreement to see how many soil samples you said you would take. Usually, it's 1 sample per APN or per field.
Next, mark an area of 30' by 30'. Take samples from 9-10 locations within that sampling unit. You can pick your locations by either:
- Walking in a zig-zag pattern
- Dividing the field into 9 grids of 10' by 10' and collecting one sample from each grid
Once you've chosen a location, here's how you can take a sample:
- Remove any vegetation, litter, or crop residue
- If you use a shovel:
- Use the shovel to dig a small hole 8” deep. From the side of the hole, take a vertical rectangular slice of soil 8” deep and 2” thick. Remove any extra soil to ensure that the sample is the same width at the top and bottom of the slice.
- If you use a soil probe:
- Twist the probe into the ground until the probe is 8” deep.
- Place sample into clean bucket
- Go to the next location and repeat until you finish all 9-10 sampling locations.
- Mix soils in the bucket and pour at least 6 cups/1 lb of soil into the sample bag.
- Label the sample bag with the APN, sampling date, and farm name.
Now that you have your sample, send it to a soil lab nearby that uses UC methods. Tell the lab that you'll need results for the soil's organic matter content.
For more information, reach out to your local climate smart agriculture specialist. We can help you take your soil samples and find a local soil lab. For more information, read through the grant manual: https://www.cdfa.ca.gov/oefi/healthysoils/docs/2020-HSPIncentives-GAPManual.pdf
Grower Profile #1: Frank Fernandes
Practices: No-Till, Strip-Till, and Cover Crops
Frank Fernandes grew up in a big dairy family in Tulare County. He has continued that tradition and now farms about 1,500 acres near Pixley. He grows corn, wheat, and alfalfa as forage for his cows. He also has a young pistachio orchard.
Frank and his brothers were among the first in their area to try out no-till 20 years ago. They ran into difficulties and converted to strip tillage 18 years ago. This practice minimizes the number of tillage passes they do. On his strip-till fields, Frank has gone from doing 15 passes per year to only 4 or 5, which saves him fuel and time. He currently implements a hybrid system of strip-till wheat and no-till corn. In 2020, he received a grant award from the California Department of Food and Agriculture's Healthy Soils Program to expand his use of strip tillage.
What initially drove Frank and his brothers to implement strip tillage on their fields was the prospect of reducing their tillage and fertilizer costs. When Frank started going to conferences and meetings about soil health, he learned about the soil health benefits of reducing disturbance and increasing plant diversity.
Four years ago, those discussions inspired him to test out a no-till system on one of his fields and to experiment with cover crops. In this field, he's down to 3 passes per year and 2 crops. He will have to stop planting cover crops in his forage fields to comply with his groundwater agency's implementation of the Sustainable Groundwater Management Act. However, he will continue to plant cover crops in his pistachio orchard, as he believes that the benefits of cover crops there outweigh the extra water costs.
Frank has found many benefits in implementing no-till and cover crops on his trial field.
The first major benefit is his reduction in costs. He has seen a decrease in fuel costs due to fewer tractor passes. He has also begun to reduce his fertilizer usage, since his cover crops provided some of the nutrients needed for his forage crops.
These practices did come with a negative effect on yield for the first couple years of his trial, but he found that the decrease in costs outweighed the drop in yield. The practices still penciled out, even in that first year. The yields have steadily increased over the past 4 years, while the costs have remained low.
Cover crops are supposed to encourage the proliferation of beneficial insects that reduce pest pressure. Frank has had very little pest pressure this year and has only had to spray insecticide once, but this might be due to this year's weather. He explained that it's hard to see the effects of a cover crop in one field when he's surrounded by growers spraying much more than he does, inadvertently killing off the very beneficial insects he wants to encourage.
In terms of water consumption, he has seen that his no-till field needs more water to get to saturation when he irrigates. However, the field can go for longer periods of time between irrigation events and needs fewer overall irrigation events. He's also seen that the crops suffer less from heat and drought stress than those in neighboring fields. The soil itself is cooler and keeps the plants healthier.
He's seen fewer weeds in his no-till field, which has resulted in 1 fewer herbicide application per year compared to his other fields. Weed seeds deep in the soil profile remain buried and cannot germinate. However, he pointed out that cover crops themselves can become weeds, so it is very important to pick the right cover crop for your situation.
One of the intangible benefits that Frank mentioned is that doing these practices has made farming more fun and enabled him to feel good about his stewardship of his land. He feels like he is doing his part to farm in a more sustainable way.
Frank has faced 2 main challenges with his cover crops.
The first is planting the seed correctly. The drill doesn't always put the seed into the soil at the right depth, so the field doesn't get a uniform seed coverage.
The other challenge is, of course, water. He has the choice to irrigate his cover crops and pay for that extra water or depend on the unpredictable winter rains.
The biggest challenge that Frank has faced with implementing no-till on his field is psychological. Not disking or ripping the field goes against decades of experience. Doing this method was a big leap of faith at the beginning of this trial, when he wasn't yet seeing the benefits. But now, he says that only doing 3 passes per year is no longer a difficulty. It's a major advantage in terms of reduced costs.
Frank would cautiously recommend these practices to other farmers. He explained that not all irrigation systems are set up for the challenges and each farm is different, so each grower's learning curve will be different.
For those starting out, he recommends starting small and slow. That way, the impact of that learning curve on your bottom line will be minimal. Growers can expect to start saving money that first year, despite the lower yields while the soil adapts to the change in management.
For cover crops, Frank recommends planting later in the season when there is more moisture. For instance, planting right before a big storm so that the cover crops can take advantage of the rain.
He also found that it's best to work the ground for strip tillage right behind the chopping crew. This leaves the ground moist and produces a nice seed bed. If you wait, you run the risk of the ground getting too hard and breaking your equipment.
He has ended up simplifying his equipment needs. He went from a disk to a vertical tillage bar. Instead of buying more and more equipment, he decided to sell off the intensive tillage equipment that he no longer used and use the proceeds to buy the equipment that would enable him to do no-till and strip till.