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Are There Reasonable Alternatives to Fall Tillage for Residue Management?
Dec 24, 2020
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Big crops mean big residue left behind! One the positives of big residues means lots of organic matter to return to the soil, which supports soil health and return or cycling of various nutrients like P, K and micros. All of this supports microbial life, reduces the potential for soil erosion by helping to keep ground covered through the vulnerable non-growing season and supports resilient soils.
Residue Management Begins at Harvest
How do you manage those residues? Residue management has traditionally been tillage, but the first step in residue management should begin with the combine. As combines get bigger and headers get wider, its crucial to employ the right straw chopper/spreader to manage the residue coming through the combine. It is imperative that the chopper be able to spread the residue evenly over the full width of the header. It’s also very important that the chaff is spread separately than the straw when windrowing so that matting doesn’t occur in a concentrated band right behind the combine. This matting, regardless of crop, impacts seeding effectiveness, germination uniformity and early growth of the next crop. It also increases the potential for slug damage. Figure 1 shows residue being spread evenly behind the combine and to the width of the header in both wheat (chaff) and soybeans.
Covering the soil prevents spring sunlight from drying out and warming up the soil, which may delay planting dates.
Crop residues can interfere directly with seeding if the tillage and planting equipment is unable to cut the residue. Where the disks cannot cut the residue it gets pushed down into the seed trench and creates a barrier for good seed-soil contact that is critical to ensuring rapid and uniform germination of new seeds. This is called “hair-pinning”.
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