| May
11, 2007: I saw a bumper sticker awhile back. I remember
it often when reality interrupts the future I have all mapped
out. It said: “If you want to make God laugh…tell
him your plan.”
Well, he must be laughing, because I had a plan. We’ll
call it Plan A.
Plan A was to plant my cover crops on time last fall…check;
have good weather to get the cover crop germinated and growing…check;
get the crop through the winter in preparation for rolling
and no-till planting…uh oh. No check.
Reality is that most of our vetch cover crop didn’t
survive the winter. And that means Plan B, and in some cases
Plan C, needs to materialize—and fast.
What happened? I can’t say for sure, but it may have
been a “perfect storm” scenario. First we had
a long, mild fall. This was great weather for harvesting and
for growing cover crops, but it never really cooled off. We
had a few days of cold weather early in December, then it
warmed right up. January saw many folks outside in just a
T-shirt. Then, in early February, the bottom fell out and
the temperature plummeted.
We had no snow-cover for the first few days, then snow well
into March. Spring never wanted to get here until early April,
then—wham!—summer.
When you couple this weather pattern with the traits of some
vetch varieties we used, it spells disaster. Why? Some varieties,
those grown in more-temperate climates, can’t seem to
adjust to unusual weather cycles.
I believe one of the varieties we planted “interpreted”
the warm spell after that first cold snap as a sign spring
was here. It began to grow, then couldn’t stop when
the weather got cold again and it froze out. Other varieties
stayed dormant through the early warm snaps, revived later
with no problem and now look great.
This really points out the need to source your cover crop
seed appropriately. (For details on vetch variety winterhardiness,
in our experience, see Dave
Wilson’s article from last month.) From my experience
here in southeastern Pennsylvania, seed grown in northern
climates works best.
Now what?
So back to Plan B. What are my choices for substitute fertility
and weed management? While we get loads of benefits from legume
cover crops, the benefit we need most going into corn is nitrogen.
Manure and compost:
If you have access to animal manure, your N problem may be
solved. Figure on adding enough manure to cover your nitrogen
needs, and you’re off and running. Compost can work
even better if you had the foresight to make some last year.
Luckily, we have some of both. We make a fair amount of compost,
and almost always have some on hand to use. I also had some
leftover poultry manure to apply (which I did).
Emergency cover crops:
I thought a lot about the option of using a short-season cover
crop planted earlier in spring. Leading contenders were field
peas or Austrian Winter Pea. We actually tried both in one
field. I’m waiting to see how much nitrogen that will
supply.
I was part of my problem, too. I waited too long to make
my ultimate decision to abandon our vetch crop. I was hoping
it might recover, but my hope was misplaced. The idea of rescuing
a failed winter-legume planting in spring with a quick legume
planting is a good one. It’s especially important for
organic rotation systems but needs more research on dates,
rates and fates before we’ll really know what’s
possible in different situations.
“Buy” the bag:
We always have the option of going out and purchasing nitrogen
in several different forms that our organic certifier approves.
Corn gluten, peanut meal, Chilean nitrate and many other sources
are commercially available and can help to meet the nitrogen
needs of any crop.
Incorporation and weeds:
No matter what course of action we choose to take at this
point, it looks like plow tillage will be in the picture to
control weeds. No-tilling into sparse cover crops or bare
ground in an organic situation just won’t be an option.
So maybe your Plan A didn’t work either. With a crop
rotation and a network of resourceful farmer problem solvers
to consult, you still have options to figure out your Plan
B. Or Plan C.
I still wish we could go back to Plan A and do organic no-till
in waist-deep hairy vetch at 75-percent bloom, but then God
wouldn’t get his laugh on me. Hope all is well on your
farm.
From One Farm to Another.
Jeff
PS: If you’re willing to share some of your creative
work-arounds at a time when your big Plan A fell through,
drop
me a note. I’ll feel better, and maybe God will
smile again at what we’ve learned. |
