There are distinct differences in the active ingredients and percentages between the Sprint 138 Chelated Iron and the Sprint 330 Chelated Iron. You can use the compare tool on our site, or follow THIS LINK to see them compared side by side. The Sprint 330 contains 7% Nitrogen and 10% Iron, whereas the Sprint 138 contains 4% Nitrogen and 6% Iron. The higher percentages will give a deeper green and more growth to the lawn than the lower percentages.
Typically chelated iron like Sprint 330 Chelated Iron 10% can be applied once during the spring. We suggest contacting your local cooperative extension office for assistance with how often to apply this product for your circumstance.
Sprint 330 Chelated Iron 10% is labeled for use in turfgrass. Repeat application timing will depend on your application and how it is applied. Please be sure to review the product label for more information an complete application instructions.
