Fertility - Time to Tissue Test

Thursday, July 31, 2014

Hi Folks,


First off, thanks to everyone who came out to our first Vineyard Walk of the season at Planters Ridge - and thanks to John and Lisa for having us! 


I hear from a lot of people around this time of year wondering what (if anything) they should be fertilizing with in their vineyards.  While soil tests do a great job of telling us what's in the soil, it doesn't always translate into what the plant is able to take up!  I am a strong promoter of tissue testing with any perennial fruit crop (and really even many longer season annuals).  It's just a really good way of determining what the plant is able to take up from the soil and what you might need to look at supplementing! 


Generally with grapes, tissue testing is done during Bloom or at Veraison!  Since we are quickly approaching Veraison, I thought it might be timely to post some info on taking your tissue tests!


Sample each variety separately and if you have blocks of the same variety in different areas, it might be best to treat them as separate samples also. 


You can find information on what plant part to sample on the NS Analytical Lab Website  and you can click here to download a copy of the sample submission form. 


When you get your results back, it's a good idea to compare them against 'normal' ranges (this one is from the Midwest Grape Guide)


Suggested "Normal" Ranges of Nutrients from Grape Leaf Petioles* Nutrient
Normal Range
Nitrogen (N)
0.9 – 1.3 %
Phosphorus (P)
0.16 – 0.29 %
Potassium (K)
1.5 – 2.5 %
Calcium (Ca)
1.2 – 1.8 %
Magnesium (Mg)
0.26 – 0.45 %
Manganese (Mn)
31 – 150 ppm
Iron (Fe)
31 – 50 ppm
Copper (Cu)
5 – 15 ppm
Boron (B)
25 – 50 ppm
Zinc (Zn)
30 – 50 ppm


If your values are significantly higher or lower than these - please feel free to give me a call to discuss! 


Finally please mark Thursday August 21st on your Calendar for our second vineyard walk of the season.  Details will be announced on location soon!  Stay tuned to the blog and our facebook page for details. 

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