Posted 31 October 2017. PMN Crop News.
UGA Extension Soils and Fertility Specialist Glen Harris Advocates for Conservation Tillage
Source: University of Georgia Press Release. www.plantbio.uga.edu
Athens, Georgia (October 23, 2017)--Conservation tillage saves farmers time and money and improves the soil, but only 20 or 30 percent of Georgia farmers use this system, according to University of Georgia Cooperative Extension soils and fertility specialist Glen Harris.
“More farmers don’t switch to conservation tillage because they’ve always used conventional tillage,” Harris said. “Farmers are worried about a yield drag and putting money into new equipment. But again, in the long run, I think conservation tillage is probably one of the best things we can do. It’s only called ‘conventional tillage’ because it’s what's being done most frequently.”
A conservation tillage system begins with a cover crop, like rye or cotton, that’s planted during fallow times of the year, such as late fall and early winter when row crops have been harvested. The cover crop is killed prior to the planting of next year’s summer crop.
If farmers maintain this system, the plant residue from the cover crop builds organic matter in the soil over time, which leads to reduced erosion and added nutrients in the soil.
Harris describes conservation tillage as minimal tillage with less soil disruption. Farmers apply all of the fertilizer and lime on the surface and do not deeply turn the soil. Farmers who use conservation tillage systems might only dig a few inches into the ground for a soil sample, rather than the typical 8 or 9 inches associated with conventional tillage, to determine the soil’s fertilizer needs.
Southern Georgia soil tends to be naturally low in organic matter. Conventional tillage doesn’t add organic matter to the soil, but cover crops grown in conservation tillage systems provide an opportunity to increase the soil’s organic matter, Harris said.
“(Conservation tillage) helps hold in the nutrients that we’re putting down, and it can also help to hold water, which can be very important around here,” he said.
Conservation tillage requires different equipment. Instead of using deep-turning plows or harrows, farmers use a strip-tillage rig, and they have to learn how to farm with it, Harris said. However, once the switch is made, growers save money and time because they make fewer trips across the field.
Increased herbicide use may call for increased spending, but that depends on the weeds the conditions for the year, according to Harris.
“A lot of people think you can’t make comparable yields using conservation tillage, but I think you can. Sometimes you don’t make them right away just because you’re learning a new system,” Harris said. “Yields can be, in my opinion, just as good.”