Fall fertilizer applications can take one more job off a grower’s spring checklist. Applying months before planting also can raise concerns about nutrient availability next spring. With fertilizer costs top of mind, growers need confidence that nutrients applied this fall will still be available to their crops next spring.
CG P2X from Ostara offers a flexible approach to fall fertility, helping growers prepare fields ahead of spring planting while preserving a nutrient source for the coming crop.
With a 9-42-0 analysis plus 9% magnesium, CG P2X supplies nitrogen, phosphorus and magnesium in one granule. Its distinguishing feature is how those nutrients are released. Rather than dissolving readily in water, CG P2X responds to organic acids and localized acidity associated with roots and soil biological activity. That difference is particularly relevant when considering a fall application.
Preserving nutrients from fall to spring
Traditional soluble phosphate fertilizers begin dissolving when exposed to moisture. Once released, phosphorus can react with calcium, iron or aluminum in the soil, becoming less readily available to crops. Applying fertilizer does not necessarily mean the same amount of nutrition will be accessible when roots begin growing.
CG P2X is designed to help preserve nutrient availability by keeping nutrients within the granule until conditions favor their release. In an overwintering study comparing buried bags of CG P2X with MAP, DAP and triple superphosphate (TSP), CG P2X showed essentially no change in granule weight. The conventional fertilizers lost approximately 50% to 85% of their weight as material dissolved and moved out of the bags. The study ran from December through March, with nearly three inches of precipitation recorded during that period.
That measurement tracked material remaining in the bags. It did not establish that dissolved nutrients had left the field. What it demonstrated was a clear difference in release behavior. CG P2X remained stable during the winter testing period, retaining its nutrients within the granule.
For growers evaluating fall fertility options, that is a meaningful result. It supports the opportunity to apply ahead of planting while preserving a nutrient source for the coming crop.
Built to work with the growing crop
Stability over winter is only part of the story. Those nutrients also need to become available as the crop develops.
This is where roots and soil biology enter the picture. Plant roots release compounds called exudates, including organic acids. Soil microorganisms also produce acids and influence the chemistry surrounding fertilizer granules. Those processes help dissolve CG P2X and release its nutrients.
When we describe CG P2X as demand driven, we are describing a system involving the plant, soil chemistry and microbial activity. Roots contribute to that process, but they are not the only source of nutrient release.
Beneficial fungi can also help crops access nutrition beyond the immediate root zone. Mycorrhizal fungi extend fine threads into surrounding soil, helping capture nutrients and transfer them to the plant. Together, roots and microbes support the connection between fertilizer in the field and nutrition inside the crop.
Based on years of research, 95% of CG P2X nutrients are available to the crop in the first year. That availability helps protect the value of a fertilizer application while supporting access to nutrition during the growing season.
An advantage for fall-planted wheat
CG P2X also fits fall applications made at winter wheat planting. Its nutrient release mechanism supports availability as the crop establishes in fall and resumes growth in spring. Its low salt index helps reduce the risk of fertilizer salt injury near the seed, keeping essential nutrients close to developing roots. For wheat growers, that combination brings seed safety and nutrient availability together in the same application.
Download Ostara’s wheat information sheet
Make fall part of your spring strategy
Moving a fertilizer application to fall can give growers more flexibility when spring work begins. CG P2X pairs that scheduling opportunity with a release mechanism designed to work with the crop and its soil environment.
Phosphorus supports energy transfer and crop development, while magnesium is essential to chlorophyll and photosynthesis. Those nutrients support the crop from establishment through continued growth.
The next step is matching the product to your fields. Application timing, placement and rate should fit your soil conditions, cropping system and fertility goals.
Talk with an Ostara representative about fall applications of CG P2X.
