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Nutrient Management Planning

Nutrient Management PlanningDan Davidson, PhD
Agronomist, Consultant

Every producer is concerned about the health and progress of their crop be it carrots or corn or radishes or wheat. Checking the visual cues is one way to check the health of a crop. Crop exhibit very specific symptoms when something is wrong and you can use that information […]

Soybean sampling – much easier than alfalfa plucking

Soybean sampling – much easier than alfalfa plucking
Dan Davidson, PhD
Agronomist, Consultant

I am running a project on a field of soybeans this summer, sampling every two weeks over a 10-week period. I can tell you sampling soybeans is much easier than alfalfa and ever easier than corn where you have to plow through a […]

Sap test – better deal that tissue testing

Sap test – better deal that tissue testing
Dan Davidson, PhD
Agronomist, Consultant

Crop Health Laboratory’s sap test is not just a good test to check the nutrient levels and metabolic health of the plant it is also a better economic deal considering all the information you get.

The conventional tissue only test measures nitrogen, phosphorus, potassium, calcium, magnesium, […]

New and Old Leaves – Why Both Are Important

Dan Davidson, PhD
Agronomist, Consultant

One unique feature of sap analysis is that they ask you to sample both old and new leaves.

This probably strikes people as a bit odd because tissue testing requires only a certain grass leaf or trifoliate or petiole from a certain position on a broadleaf plant. The reason for this is that […]

Blood Test for Plants

Dan Davidson, PhD
Agronomist, Consultant
Sap analysis – this new technique is like a blood test for plants.
When you get a health check-up at your local doctor’s office, two things happen. Firstly, you are asked pages of questions about previous health conditions, family history, lifestyle choices, happiness level, and many others. Secondly, a nurse checks your pulse […]

Why Test for Nutrients

Dan Davidson, PhD
Agronomist, Consultant

Maintaining nutrient reserves and their availability in the soil is important to productivity of field and specialty crops. However, too little or too much of any one nutrient can cause problems. In fact, excess amounts can be as detrimental as a deficiency. As a producer or agronomist your goal is to make […]

Crop Health Lab’s Agronomy Blog

Blogs provide an excellent opportunity to share information and ideas, discuss management practices and respond to questions from readers. In short – it is a place for agronomist and crop consultants to share timely and relevant information on plant nutrition, testing methods, and discuss recommendations for managing crops and improving yield and quality.

Crop Health […]

Sap Analysis – Validation in Corn and Soybean

Dan Davidson, PhD
Agronomist, Consultant
Sap analysis is a new approach to measuring nutrient sufficiency in plants. Sap testing measures the supply of soluble nutrients entering the leaf instead of assessing what is in the whole leaf tissue like tissue testing. What appeals to me about this test is that it monitors the supply of nutrients going […]

Reader question 1: What’s the relationship between sodium and EC?

Last week Crop Health Labs sponsored a webinar event for several agronomists and consultants in the Midwest. Afterwards, one of the consultants in attendance emailed me the following comment:

“I would like to know what correlation there is between sodium and the EC reading and more information on how to interpret how we can use […]

Sap analysis sabermetrics

First, I want to thank those of you who have been reading this blog and taking an interest in the content.  I recently spoke with a consultant in Iowa who said he’s been paying attention to it.  I was pretty surprised–but also glad pretty glad to hear it.  If you are inclined, you may follow […]