Welcome to
Growing With Robby
Services
Expert Garden Design and Maintenance Solutions
Pruning Services (15ft and under)
Designing And Planting Gardens
Invasive Plant Removal
Turf Management
Pest and Disease Control

Soil Testing
We conduct soil tests by taking multiple core samples from each plot/field and
submitting them to a specialized lab that can test your water as well as perform the
newer saturated paste test. Most universities only offer the standard test known as a
Mehlich 3 test. Testing the soil can save you tons of money by knowing whether or not you need to add fertilizer or compost. More times than not, there is usually an excess of a
particular nutrient which can prevent plant uptake of other nutrients. (See figure 1)
This comes from applying fertilizers year after year without testing to see if those
fertilizers are needed. Other times a pH imbalance is the reason plants can’t take up nutrients so adding fertilizer will not only cost money, but can compound problems
when the plants can’t take up the added fertilizer anyways when the pH is off. (See
figure 2)
Mulder's Chart
Figure 1.
The red arrows coming from a nutrient show which other nutrients it will
lock out if that nutrient is in excess in the soil. A common over applied nutrient is
Phosphorus. We can see here, if there is too much phosphorus, it will prevent the
plant from being able to access copper, calcium, potassium, iron, and zinc. The
green arrows indicate if there is the correct amount of the particular nutrient, which will help with the uptake of the nutrients it points to.
Plant Availability
Figure 2.
This chart shows the plant availability, for most agricultural crops, of
mineral nutrients based on what pH the soil is. We can see here that the availability
of nutrients are at their highest between a pH 6 and 7. The availability of these
nutrients greatly decreases outside of this range so sometimes the answer to crop
health is just fixing the pH and not purchasing more fertilizer. There are certain
crops that prefer more acidic soil like blueberries, and some that prefer more
alkaline soil like asparagus and pole beans, but this is still a good chart to reference to understand how pH affects nutrient uptake.
We offer various types of soil testing including:
Standard Soil Test
This test will tell you what mineral nutrients you have in your
soil and the amount of each nutrient. It will also tell you the pH of the soil, cation exchange capacity which is the ability for your soil to hold on to nutrients during heavy rain or watering events, and organic matter %. This is helpful for determining if you need to add more organic matter, like compost to your soil. This will also tell you if you need to add more, or if you have too much of any particular nutrient to your soil for maximum plant health and production.
