Let’s learn more about SMARTGRO® and see what’s the different between SMARTGRO® controlled-release fertilizer vs slow-release fertilizer!
What is SMARTGRO®?
SMARTGRO® is comprised of a water-soluble fertilizer encapsulated in a unique polymer coating. The coating allows moisture to penetrate and dissolve the nutrients inside the shell. Dissolved nutrients are slowly released at a constant rate depending on the soil temperature.
Controlled Release Fertilizer – SMARTGRO®
Controlled ReleaseFertilizer vs Slow Release Fertilizer
A common misconception is that Slow Release Fertilizers (SRF) and Controlled Release Fertilizers (CRF) are the same. Both deliver nutrients over a duration but are completely different products. Controlled release fertilizers are only affected by one factor – soil temperature and therefore releases nutrient at a more predictable rate. Controlled release fertilizers only come in a granular form where the coating regulates the nutrient release.
Slow-release fertilizers, on the other hand, is affected by soil temperature, moisture, and pH. Slow-release fertilizers come in granular, nugget or packet/sachet forms where the release mechanism varies widely.
The table below compares the different types of controlled release fertilizer vs slow-release fertilizer on the market.
Comparison of controlled vs slow-release fertilizer
|Technology||Polymer Coating||Sulfur Coating||Urea reaction product||Compression||Nitrification/Urease inhibitors|
|Release Mechanism||Diffusion||Rupture of coating||IBDU: Hydrolisis|
MU/UF: Microbial activity
|Smaller surface area||Inhibition of enzymes|
|Longevity||2-16 months||2-3 months||IBDU: Hydrolisis|
|2-4 months||Depends on soil moisture and bacteria|
|Release Controlling Factor||Temperature||Microbial activity, moisture, temperature||Microbial activity, moisture, temperature, pH, organic matter||Microbial activity, moisture, temperature, pH||Microbial activity, moisture, temperature, pH|
|CRF or SRF||CRF||CRF||SRF||SRF||-|