Volume 38, Number 01 | January 9, 2012
$4.25
PRACTICAL PRODUCTION TIPS FOR THE PRAIRIE FARMER
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Three uses for forage radish Looking for a way to combat hardpan? A grazing opportunity? Increased soil fertility? Consider tillage radish as an option for your farm BY KEVIN ELMY
W
hen Columbus left the safety and comfort of his home to find the New World, people thought he was crazy; everyone knew the world was flat. Instead of finding India, Columbus found North America. Not what he was looking for, but a remarkable discovery. What does Columbus have to do with agriculture? Products that were developed for one market can be a remarkable solution for a different problem. Tillage radish is one of those products. In 2001 Steve Groff and Dr. Ray Weil from the University of Maryland started developing tillage radish as a cover crop to improve soil health, break up soil hardpans and control weeds. After years of experimenting, fine tuning, and local agronomic development, Cover Crop Solutions now markets tillage radish as a wonder plant with many uses, widely adapted to different climates.
COVER CROPS A cover crop is planted to cover the soil. This practice can manage soil fertility and quality, control pests, create a disease and insect break, control erosion and nutrient loss and provide a grazing opportunity. Cover crops are not common in Western Canada but are used indirectly. Greenfeed crops, annuals used for grazing and green manure crops can be referred to as cover crops. In most cases cover crops are a monoculture, or sometimes two or three crops mixed together. These work, but a true cover crop is made up of multiple species grown together to get the best effect. Multi-species mixes will include both monocot and dicot (grass and broadleaf) species. Of the broadleaf types, most mixes will try to include pulses and, warm season and cool season types. The idea is to mimic nature by creating diversity in the stand. This diversity ensures that different
parts of the soil will be used, that the stand will be made up of plants that grow to different heights at different times under different conditions, and that there are a variety of effects on the soil. Pulses will fix some nitrogen, cereals add fibre, and brassicas will scavenge nutrients. But most of these species’ roots tend to colonize only the top six inches of the soil. Enter the tillage radish.
TILLAGE RADISH Of all the forage radish line, tillage radish has been selected based on top growth and a straight root that produces good loosening action deep into the soil. Oilseed radishes produce roots similar to canola. The tillage radish produces a “super carrot” type of root, driving down two to four feet and creating root pressure measured at 290 psi. Aggressive top growth allows the plant to smother the ground and choke out weeds. Tillage radish can be seeded almost at any time after June 20. Seeding after the summer solstice allows the plant to produce more root mass and more vegetative mass. (Corn responds the same way when seeded later than normal for grain production.) For root growth, researchers recommend allowing 40 to 60 days of growth before a killing frost, three consecutive nights of -8 C. One common concern is seeding into cover crop residue. Because
The tillage radish produces a ‘super carrot’ type of root, driving down two to four feet and creating root pressure measured at 290 psi. carbon-to-nitrogen ratio. This results in a quick rot in the spring. The roots will dry up, and the root channels left by the rotting tubers will have the appearance of a major
radish. This is released to the next year’s crop as it rots. Next year’s soil will have a lower pH and nutrients will be released slowly, resulting in higher yields.
HARDPAN
Once it’s growing, the tillage radish will drive its root down. If it encounters a hardpan, it will send out root hairs. cover crop species should be picked based on compatibility to spring breakdown, most species are well rotted by spring. Tillage radish leaves are mostly basal with high moisture and high protein, leaving a tight
gopher infestation. These channels will reduce compaction and allow the soil to warm up quicker. Cover Crop Solutions’ research has shown significant nitrogen and phosphate accumulation in the root of tillage
Once it’s growing, the tillage radish will drive its root down. If it encounters a hardpan, it will send out root hairs. When a root hair finds a crack, it will develop into a root, cracking the hardpan open. Since the Prairies have seen well above average moisture and not much soil frost, there is a lot of hardpan in the soils, limiting crop development and moisture infiltration. Tillage and seeding operations will accelerate hardpan development.
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If the goal is to break up hardpan with a pure stand of tillage radish, researchers recommend using seven to 10 pounds of seed per acre. Higher seeding rates are used on heavy soils with good moisture. The goal is to produce lots of small roots to break up as much of the hardpan as possible. For grazing, a mixture of species is a must. Tillage radish has high feed values, and is high in protein. It’s best to mix in 50 to 60 per cent grass, along with pulses and potentially other brassica species, rates depending on plans for next year’s crop and the animals grazing the mix. On our farm we saw production of nine to 17 wet tonnes per acre from our tillage radish, » CONTINUED ON PAGE 4
Wheat & Chaff ..................
2
Weather .............................
4
Features ............................
5
Columns ........................... 12 Crop Advisor’s Casebook
16
Machinery & Shop ............ 19
Four ways to identify hardpan ANGELA LOVELL
PAGE 8
Agritechnica coverage — new machinery on display SCOTT GARVEY PAGE 19
Cattleman’s Corner .......... 25 FarmLife ............................ 34