Now is the time to consider sending in vine samples for analysis. FULL BLOOM is the period when GRAPE PETIOLE ANALYSIS is performed - it will show what the vine is receiving in the areas of Nitrate Nitrogen, Phosphorous, Potassium, Calcium, Magnesius, Zinc, Manganese, Boron, and Sodium. The analysis report will also show what the "Optimal Range" is for each of these areas.

I have used CALIFORNIA GROWERS LABORATORY
4630 W. JENNIFER, SUITE 104
FRESNO, CA 93722

TEL: 559 - 275-3377
WEB: WWW.CAGROWLAB.COM

One of the Viticulturists at the Lab is Roger Kerneur who is very knowledgeable and helpful. If you pull up the Lab web site you will find instructions on not only Tissue Sampling Procedure, but also Soil Sampling Procedure.