Re: JD SELLER bpa

Posted by JD Seller on August 14, 2013 at 21:57:34 from (208.126.196.144):

In Reply to: JD SELLER bpa posted by stonerock on August 14, 2013 at 17:21:41:

Stonerock: Figuring the yield estimate on your soybeans does not use the seeding rate you planted. You need to know the actual final stand in the field. The seed beans you bought did not have a 100% germination and the weather conditions effect the surviving plants too.

There are several ways to figure the final stand on soybeans. I use the hoop method. I check my soybeans when they are 3-4 inches tall. I use a 36 inch diameter "hoop". I made the hoop out of 3/4 PVC pipe. I randomly throw/roll the hoop in ten places in the field. I count the number of plants inside the hoop. So lets say I have an average of 27 plants inside of the hoop after ten samples. The area in a 36 inch circle is 1/6165 of an acre. So you multiply the average plants in the hoop times 6165. In this example that would be 27 x 6165 = 166,455 plants per acre.

I mark the plants in several of the hoop circles with a red string around the stem at the base. I just loop it loosely around the base. I then mark the spots with red flags. So I know the average stand at the 3-4 inch stage. I go back and check the plants as the field grows. I modify my population estimate based on the number of live plants that reach maturity/pod stage in those hoop circles.

So I know the estimated population when the plants mature.

With this number I then count the pods on ten plants scattered around the field. I also count the beans per pod on those plants. So with these two numbers I can get an average number of pods and beans per plant.

I take that average beans per plant and multiply it times the plants per acre. This gives me the "beans" per acre.

With that number you then have to estimate the seed size. I usually used 3000 per LBS in a dry year and 2700 per LBS in a good growing year.

This is the hardest part of making an estimate. I check myself at harvest by counting a 1/4 pound of the beans a few times in the fields I estimated the yield in. You kind of learn what the average sizes you grow are.

So that is the long story of how you can estimate the final yield of your soybeans.

I have checked my estimate with the actual final yield across the scales. The estimate is usually within 5%.

Replies:

• Re: JD SELLER bpa merlynr 09:30:29 08/15/13 (0)
• Re: JD SELLER bpa 60 acre hillside 03:11:43 08/15/13 (1)
  • Re: JD SELLER bpa j hikemper 05:20:40 08/15/13 (0)

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