[nielreal]

I have been searching the internet trying to figure out what is an acceptable amount of canola seeds behind the combine and I am coming up with 400 seeds per square foot makes a bushel loss per acre. Can this be right ?? I am picking up a 18 foot swath with a 1680

 

[crw]

How many are you finding back there?

 

[Don Boles]

If you mean evenly across the field that takes about 100 seeds sq/ft.

 

[cobra1970]

FYI: This Chart can be used for any combine in the 55" range for width of machine. This would be sufficent for most combines on the market.

 

[nielreal]

It is hard to see them but I would guess I have about 100 seeds per square foot behind the combine at most

 

[Don Boles]

That chart assumes a smaller seed size than what has likely became average with the hybrids now but unlike wheat which has a fairly narrow
range of seed size canola can vary by over 2 to 1, for example 3 to 7 mg/seed, whereas wheat tends to be around 40 mg.

 

[crw]

I was just curious. I tossed a pan under mine yesterday and caught a few but wasn't sure how many was too much. I was way under 100/sq. ft.

 

[nicemustang]

A bushel per acre is too much over, should try to aim for 1/2 at most.

Use the pami seed loss guide. http://pami.ca/wp-content/uploads/2012/06/Canola-Coucil-of-Canada-PAMI-Seed-Loss-Guide.pdf

 

[skgrain]

Its 23 seeds in a meter square=1kg. So thats 49 seeds in a square foot = 1 bushel of canola.

 

[farmingsk]

This will do it: Combine Loss Calculator

 

[fjlip]

I catch in a 3 sq ft pan, clean and weigh the seeds. Of course need to assume that chopper is not spreading back 100% and it tends to concentrate to ouside of spread pattern. Getting 0.5 gms per sq. ft. on average.
Do the math for 43560 sq ft / acre= 21780 gms/ acre, divide by 454 gm/lb= 48lb/ acre.
I assume that on half the spread so 24lbs/ acre, half bu. 40bu canola, 35' swath at 4.5mph. Seeds are too small to count. IMO

 

[nielreal]

some calculations put it at 685 seeds per sq ft. I am talking right behind the combine .

 

[Duane H]

In the STS book it's 822 seeds per square foot on a 30 header. That's on a 9750. We are running 5 mph in 45bu crop and using a 6.44 square foot catch pan chopper lifted and getting maybe 100 seeds. Was going to drop pan again today and weigh sample.

 

[Duchek]

In the STS book it's 822 seeds per square foot on a 30 header. That's on a 9750. We are running 5 mph in 45bu crop and using a 6.44 square foot catch pan chopper lifted and getting maybe 100 seeds. Was going to drop pan again today and weigh sample.

What are you running for a fan speed on your 9750?

 

[Duane H]

What are you running for a fan speed on your 9750?

Rotor at 500 fan at 800 concave at 25 airfoil chaffer and 3 on bottom. Two small wire concaves and one large wire

 

[Duane H]

What are you running for a fan speed on your 9750?

Dropped catch pan again today running 5.3 In 45 bu canola catch pan is 18"x54" so 6.44 sq feet weighed out 20Grams of seed, cleavers and some chaff so I think that's around 1/2 to 3/4 bu so have both machines running at 4.5

 

[nielreal]

i am using a cf factor of 6 for a 18 foot swath and 100 kernels per sq ft 50 lbs a bushel 40 bushel crop and coming out with .16 of a bushel per acre loss using pami combine loss calculator

 

[rod]

i am using a cf factor of 6 for a 18 foot swath and 100 kernels per sq ft 50 lbs a bushel 40 bushel crop and coming out with .16 of a bushel per acre loss using pami combine loss calculator

I think a 1680 sieve width would be about 1.2 wide & your swath width is 5.4 wide, so your CF would be 4.5.

You should also look at Havestcalc. Developed to provide answers to these questions quickly & easily.

 

[bud]

At a seed weight of 4.8 grams/1000 seeds I calculate 130 seeds over every sq ft of the field is 1 bushel/acre loss. If dropping the straw to catch a sample and it was 5 feet wide for a 30' cut you would have to multiply the 130 x 6 to get a bushel. So in this example you would have 780 seeds/sq ft. If catching on the ground with the chopper and chaff spreader running it gets much harder to figure out.

 

[nielreal]

rod
You are probably right but that still works out to only a quarter bushel loss per acre