Tissue Testing – Best Time of Day?

Agronomists are using plant tissue nutrient analysis more each year.  For situations where you are trying to diagnose areas of fields with possible nutrient symptoms, it is important to collect good and bad tissue samples along with good and bad soil samples in each field.  Our staff often gets questions about the time of day tissue samples are collected.  Customers want to know if there is a “Best Time of Day to Collect Tissue Samples”.   To give our customers more information on this question, AGVISE did a demonstration project looking at nutrient levels of tissue samples collected at different times of day.  In this project we collected plant samples at 9AM, 11AM, 1PM, 3PM and 5PM from corn, soybean and wheat fields at various stages of growth. The figures show a few examples of nutrient levels from tissue samples collected at different times of day at different growth stages.  As you can see, there are no large differences in the nutrient levels when samples are collected between 9 AM and 5 PM.  This is good news and gives us confidence that plant tissue samples can be collected at any time of day and get good quality test data for trouble shooting and making fertility decisions.


If you need tissue sampling supplies or have any questions on how to collect tissue samples from different crops at different stages of growth please contact our staff of Soil Scientists and Agronomists.  You can also find tissue sampling information on our web site.  Just go to www.agvise.com  click on “agronomic information”, then “Sampling instructions” then “Plant Tissue Sampling Guide”.  This publication has tissue sampling information for all major crops in this region.