Originally published October 10, 2017 on Manitoba Co-Operator
By Alexis Stockford
When Rourke Farms decided to go organic, it went all in, both in terms of acres and equipment.
Over 4,000 acres of cropped land started the transition this year, while another third of that has been put to green manure and the farm’s fleet of tractors, seeders, cultivators and harrows has expanded as owners make the switch from chemicals to mechanical weed control.
In particular, the farm’s light tillage equipment became critical for the Minto-area farm while the heavy harrow, a piece of equipment that might hit the field twice a year under conventional agriculture, was hardly used, Don Rourke said.
Fields were cultivated twice before seeding, blind weeded with the light harrow before emergence, subjected to additional harrow, cultivator or rotary hoe passes in crop for weed control as needed and potentially deep tilled after harvest.
“If I had to buy three things to start out, I would buy a good cultivator, a good harrow — a light harrow for getting weeds before the crop comes up and in crop — and then a disc for plowing down green manures,” Rourke said.
Rourke’s interest in organic farming can be tied to father, David Rourke, who has been interested in organic production since attending a seminar on the subject in the ’70s.
“It’s gone mostly as expected,” the elder Rourke said of the farm’s transition. “There’s always going to be something — a rain event or weather event that makes Plan A not possible — so we have to switch gears and kind of do whatever works. There were a few decisions that we could have made if we weren’t exhausted from doing other things. We’ve got a field of hemp that’s perfect and one field I wish we’d reseeded. There’s always going to be those kinds of things and that’s, perhaps, what makes it interesting.”
The farm’s experimental forays into equipment were the centrepiece of their summer field tour, organized by the Manitoba Organic Alliance and Prairie Organic Grain Initiative.
“We attempted discing ahead of the air seeder in spring and that missed weeds, so that didn’t work,” Don Rourke said. “We actually lost days trying that and getting equipment set. We didn’t have enough horsepower to pull one and we were having tractor issues, so I think that’s the biggest thing we learned, is that discs don’t get everything, especially in spring.”
The same high-speed disc, however, proved more than useful in cutting down green manure while an Einbock 60-foot light harrow earned distinction as the piece of equipment Don Rourke, “wouldn’t be without.”
The harrow was put to work both for the post-seed blind weeding and in crop in barley at the three- to four-leaf stage with little damage to the crop, Rourke said. He noted, however, that the long harrow dealt less well with ditches, which risked bending the arms.
Rourke was less impressed with a 40-foot Yetter rotary hoe, which failed to deal with the clusters of cleaver he was fighting at the time, and a rolling stalk chopper that, while it neatly sliced down a green manure crop in front of the crowd July 28, was prone to damage from rocks.
Rourke says he has become a stalwart advocate of rock shields and has adopted S-tines rather than single-shank tines to better deal with stones.
One tour member mentioned that the rotary hoe, which received less than stellar reviews from Rourke, worked better on smaller weeds early in the season.
Other row-crop cultivators, discs, mobile grain cleaner, a precision disc drill (bought so the farm might pursue more minimal tillage in the future) and seeder were also on display.
In several cases, equipment originated from the Rourke Farms shop rather than a machinery manufacturer.
Two of the farm’s row-crop cultivators, a 20-foot and 40-foot precision model spaced at 7-1/2 inches, are the Rourkes’ own design. The two camera-guided tillers are built for in-crop weed control, tearing out plants growing between rows while leaving crop largely untouched.
While the larger home-build is in the last stage of development, tour attendees saw the smaller of the two at work in a nearby hemp field.
David Rourke estimates the home-built 20-foot cultivator cost one-fifth to one-quarter as much as a similar machine would have cost from a dealer.
Besides Don Rourke, who counts “heavy-duty mechanic” on his resumé, another farm worker is a formally trained mechanic while David Rourke, himself, has mechanical inclinations.
Perhaps ironically, given the added tractor hours necessary in the farm’s current system, David Rourke is a former advocate of zero till and actually based his master’s study on the practice.
Now, however, he says he has seen a benefit in rolling back from a strict zero-till system.
“Over my almost 40-year farming career, we’ve actually increased the rate of salinity around here and that bothers me a lot,” he said. “We have to start managing the whole upland part of the soil much different than we have in the past. Cover crops, I think, are probably the key and probably the best way to use those is organic farming. They fit in very nicely. It’s not the only way, but I think it’s the best way… you put away the Roundup jug and you have to come up with other techniques and the downside is you have to use some tillage. You have to figure out how to till shallow, how to till, sometimes, fast or slow, how to be effective with tillage without spending a lot of time and money and fuel doing it.”
No-till management has been widely advocated to limit erosion and improve soil health.
Despite the learning curve, Rourke Farms has projected roughly the same profit as it made in conventional agriculture through the next two years of its transition, even with one-third of its acres now put to green manure.
“We will make about the same money because we don’t have the inputs,” Don Rourke said. “We’ve had a lot of capital purchases, a lot of iron, but we haven’t factored that into actual profit. That’s capital; we could turn around and sell those. For what it takes us to grow a crop, our diesel fuel’s gone up, seed’s gone down a bit; (there’s) no chemicals, no fertilizers.”
The younger Rourke expressed concern over potential market flood, however, should a glut of farmers decide to, likewise, transition to organic production.