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Dallefeld on cover crops

Karl DallefeldKarl Dallefeld spoke at the ACRES USA conference about "capturing maximum value from diversity of plant species on your farm", mostly in relation to mixtures of cover crops.  Dallefeld has experimented extensively with cover crops on his eastern Iowa farm, and much of his talk consisted of a who's who of top cover crops for various applications.  His recommendations by category include:

  • Scavenging nitrogen - rye, sorghum-sudangrass, radish, rapeseed, ryegrass
  • Nitrogen fixation - legumes (especially clovers)
  • Quick spring cover - buckwheat, sorghum-sudangrass, berseem clover, medic
  • Late planted winter cover - annual ryegrass, rye, oats, radish, rape, turnips
  • Erosion control - barley, rye, sorghum-sudangrass, cowpeas
  • Building soil - rye, sorghum-sudangrass, sweetclover, woollypod and hairy vetch
  • Loosening compacted soil - radish
  • Suppressing nematodes - brassicas (only if tilled in)
  • Dealing with high pH - mustard, berseem clover, ryegrass, vetch
  • Fighting weeds - rye, oats, buckwheat, radish, berseem clover, chickling and other vetches, cowpeas, subclover
  • Quick, temporary pastures - annual ryegrass, oats, wheat, sorghum-sudangrass, berseem clover, crimson clover, white clover, red clover

Cover crop mixtureYou'll notice that most categories include several options, and Dallefeld prefers to mix lots of species together when planting cover crops.  His goal is to include at least one legume, one grass, and one non-legume forb (aka everything else) in each mixture, on the assumption that a more diverse cover crop assortment will do its job better.  For example, he might plant mustard, berseem clover, ryegrass, and a vetch all at once, figuring that the clover and vetch will add nitrogen to the soil, the mustard will feed pollinators and reduce the number of nematodes, and the ryegrass will build organic matter.

I was particularly struck by Dallefeld's explanation of when to kill cover crops depending on your goals.  He explains that young, succulent plants (like buckwheat at the bloom stage) provide quick nutrients while lignified (aka mature and woody) cover crops tie up nutrients at first, but end up building humus in the long run.  That's why we use buckwheat in the summer in short windows between vegetables and save oats for over-wintering, since the latter have time to rot down a bit before we plant into them the next year.

Tilling cover crops inDallefeld's experiences are with cover crops in their mainstream, large-scale application.  Generally, he sows cover crops into newly tilled fields and then tills them back into the ground before planting a vegetable, so you should be careful about using his favorite varieties in a no-till garden.  Still, we can all take his wisdom to heart --- more diversity in the garden is nearly always better.  Maybe I need to continue expanding my selection of cover crops beyond the tried and true.

Our chicken waterer keeps the flock healthy with POOP-free water.



This post is part of our ACRES conference lunchtime series.  Read all of the entries:





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