30 vs 20 inch corn - The Combine Forum
 
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post #1 of 9 (permalink) Old 12-05-2011, 04:49 PM Thread Starter
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30 vs 20 inch corn

Was wonting to move to a 20 inch planter for soybeans and don't wont to run 2 machines was wondering is the any advantage or disadvantage to planting corn other then having to buy a different corn head
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post #2 of 9 (permalink) Old 12-05-2011, 10:25 PM
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you should see a 4% increase, depending where you are from. you need to fit down the row to spray, so you need skinny tires, or you can spray sideways, tires are not cheap of course.
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post #3 of 9 (permalink) Old 12-05-2011, 10:51 PM
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We switched a few years back and like 20 inch rows. Combine tires run over rows and it chews up tires even with stalk stompers. I've never done a yield comparison with 30 inch rows, but from all the research I've seen it's hardly ever less and most of the time there is a modest increase in yield. The corn head is heavier per foot and there is more maintenance on the cornhead and the planter because of the increase in rows. All in all we like it but it does complicate some things.
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post #4 of 9 (permalink) Old 12-05-2011, 11:17 PM
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With the costs and problems listed.....and a very modest yield increase....WHY????
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post #5 of 9 (permalink) Old 12-05-2011, 11:39 PM
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It depends how far north or south you are. We are in SE Nebraska and have had independent research company doing plots for a major seed company do trials of upcoming varieties at populations of 24,000 to 48,000 and 20" or 30" rows. Our location, one year was 4 bu adv for 30", next year 5 bu adv for 20", another year even. Farther north increases advantage for 20" when looking at entire plot sets.
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post #6 of 9 (permalink) Old 12-06-2011, 12:03 AM
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Quote:
Originally Posted by harsh View Post
With the costs and problems listed.....and a very modest yield increase....WHY????
What would you call modest? 3%? Should be a reasonable number for sure. Lets do some math. 150 bpa corn times 1.03 is a 4.5 bpa increase. 4.5 bpa x $6.00 bu = $27/acre increase with only "modest" gains. 27/increase x 2000 acres of corn = $54000 dollars. Rolling planters every 2 years costs the same per acre as a 30 inch planter. Corn head just has more moving parts, but cornhead parts are cheap. Plus the added benefit of having beans in narrow rows is a nice bonus.

So I ask........Why would you ask why????????
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post #7 of 9 (permalink) Old 12-06-2011, 01:35 AM
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without knowing where you farm this question can't be answered.
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post #8 of 9 (permalink) Old 12-06-2011, 09:05 PM Thread Starter
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im in sw manitoba thinking maybe 22inch just so i can fit down the rows with my 18inch tracks in be able to spray it
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post #9 of 9 (permalink) Old 12-07-2011, 02:49 AM
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Yes then in SW toba you will see a yield bump. The latest issue of Successful Farming had a multi page article on this. We have been on 22" rows since '88 when "you can't" plant 22" corn was the only statement in NW MN.
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