Join Date: Jan 2007
Location: Three Hills/Trochu, Alberta, Canada
Mentioned: 6 Post(s)
Quoted: 4659 Post(s)
Turns out you have to do this through Google Chrome:
This is the text that goes with Steve's chart in bussard's post # 149:
Seed distribution on 5 precision drills
Counting plants per row tells story
A few weeks ago I took the time to measure product distribution across five popular precision air drills to find out if the same amount of product was being delivered to each row across the drill. What we discovered confirmed my suspicion and found that product distribution across each row of an air drill can vary to a large degree. In fact, we found a low of 29% in product variance to a high of 98%! It certainly begs the question: Why talk about optimizing plant stand densities and fertility rates when the tools we use can’t deliver our inputs accurately? So, if I aim for 30 plants ft2 in wheat, do I mean on shanks 2, 21, 36, 48 and 56?
I followed up on our ‘sock test’ this week and measured the plant stand densities of wheat planted into canola stubble on the same five air drills. I measured the number of wheat plants inside half a metre of row across 10 rows side by side. All wheat plants were at the 3-leaf stage and planted between 1 and 1.5 inches deep. The opener widths ranged from 1 inch wide on the JD 1870 to as wide as 6 inches on the Morris C2.
Now, I understand that crop emergence is impacted by many factors like residue, moisture, depth and germination. In spite of these things, there were some clear differences as it was with the sock test. We’re operating equipment with distribution issues that need to be addressed. The table you see above shows rows with plants below the average coloured in yellow and rows with plants above the average marked in red. Let me walk you through it:
• According to statistician Rong-Cai Yang, "there is consistency (homogeneity) for three pairs, Morris vs. Bourgault, New Holland vs. Seedhawk, and John Deere vs. Seedhawk. The inconsistency in other pairs is likely due to one or a few large deviations as highlighted."
• The two drills with the least amount of variance in plant densities were New Holland P1070 and the Morris C2.
• The Bourgault, which showed the highest variance in the sock test, once again had the highest degree of variance from low to high plant counts. The difference was a low of 10 to a high of 38 plants per 0.5M of row.
• The John Deere 1910 tank and the New Holland P1070 tank both have similar metering systems. They also create a fairly consistent pattern of high-low-high-low plant densities across the drill.
• The Morris appeared to be more consistent with a low of 6 plants below the average and 6 plants above the average.
• The New Holland had almost a perfect pattern of high-low-high-low plant densities.
• The SeedHawk was somewhat consistent with three rows high and three rows low across the bank of 10 rows I measured.
The impact of varying seed and fertilizer distribution can wreck havoc on our agronomy programs through ill-timed herbicides and fungicides from excessive or reduced tillering depending on each rows plant density. If 30-50% of the rows on you drill many not be receiving the prescribed seed and fertilizer rates, how much yield, maturity and protein are you losing? In a perfect world, every single furrow should have the same opportunity to optimize the performance of the plants inside it. That means the same plant densities and the same fertilizer rates on every row. Is that a tall order for $300,000 to $500,000 precision drills?
In the end, there is very little we can do to alter the distribution of seed and fertilizer outside of tweaking hose lengths and air brakes to alter air-flow and in turn product distribution. In reality, we need to find a way to move product from the tank to the opener so that it is metered right above the shank just like a vacuum planter. If we want to optimize seed and fertilizer distribution, the air delivery systems of today have to make radical changes to create planter type accuracy across every row. SL
Last edited by Don Boles; 06-08-2015 at 11:25 AM.