In Mark Chien's presentation, he recommends that the pH for growing grapevines be between 5.5-7.0.
Our soil analysis also included values of the phosphorus, potassium, calcium, magnesium, boron, iron, manganese, copper, zinc, aluminum and organic matter content of our sample. Mark Chien recommends the following values:
We will use the above information as a guide to amending our soils this fall. (I know, it is getting late!) The other thing was that because we had analyses done by two different laboratories, the information for one came back as pounds per acre and the other one as parts per million (ppm). How does one do that conversion? I looked at the chapter on Nutrient Management in Wine Grape Production Guide for Eastern North America and found out how to do it on page 157. I'll try to summarize the information:
In metric units there are:
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1,000,000 milligrams (mg) in 1 kilogram (kg)
1,000,000 micrograms (μg) in 1 gram (g)
One acre-furrow slice in agriculture is defined as 2,000,000 pounds of soil, so, to get the conversion from metric to pounds/acre, or pounds/acre to metric do the following:
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ppm x 2 = pounds/acre
pounds/acre ÷ 2 = ppm
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