Year Over Year Tree Growth

By Bill Adamsen
President, CT Chapter TACF
Year Over Year Growth
Several of our orchards have limited space for additional planting – they are essentially full – with all the trees we expect to plant for the back-cross program. The trees in these orchards have been in place for several years and have put on considerable size since planting, and we wondered exactly how much size had increased since last year's measurements. Following this year's measurements, we performed simple size (height) distribution analysis of the trees for each year for each orchard. By performing that analysis across the entire orchard we could easily compare last year's tree size overall to this years. The results are shown in Graph 1.

We also track performance for each orchard through comparative size distribution analysis. Some years see fantastic conditions for growth, and of course there are other variables as well. Some lines get planted in better parts of the orchard for growth, some years the trees get better care at a time they need it most. Each graph represents the back-cross trees grown at one orchard. The axis have been equalized to ease comparison. A binomial formula tells us growing a minimum of seventy-three trees should give us a 99% probability that we will have four progeny with the genes for resistance, in a three gene model for inheritance. The additional trees give us the opportunity to select for desirable ecological traits. Based on the tree size in several orchards we are very close to the point when we can inoculate.

hint: to better see the data on the graphs, you can expand and then view or download the full sized image. You may also download a pdf of all the tables and graphs here [220kb]

Graph 1. CT Backcross by Year
Graph of BC4F1 Back-cross trees in CT, measured in 2009 and then also 2010 for three orchards.
[click for larger image]

Graph 2. Woodbridge
Graph of surviving back-cross trees at Woodbridge Land Trust Orchard
[click for larger image]

Graph 3. Salem
Graph of Salem back-cross trees
[click for larger image]

Graph 4. NCLT Swann
Graph of surviving back-cross trees at Nothern CT Land Trust Swann Orchard
[click for larger image]

Graph 5. Guilford
Graph of surviving back-cross trees at Guilford Conservation Commission Orchard
[click for larger image]

Graph 6. Great Mountain Forest
Graph of surviving back-cross trees at Great Mountain Forest Orchard
[click for larger image]

Graph 7. Litchfield Hills Audubon Society
Graph of surviving back-cross trees at Litchfield Hills Audubon Society Orchard
[click for larger image]

Graph 8. City of Middletown Higby
Graph of surviving back-cross trees at City of Middletown Higby Reservoir Orchard
[click for larger image]

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Bill Adamsen

Bill Adamsen

Bill Adamsen is a member of the CT Chapter of The American Chestnut Foundation (TACF) Board of Directors. He served as Chapter President for eight years.

Bill Adamsen

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