Trial Results: YaraLiva CN-9 Storage and Quality Study by CSU

Yara has conducted a study in partnership with the Colorado State University with the objective of evaluating the impact of available calcium and nitrate nitrogen from YaraLiva® CN-9® on yield, packout weight, and storage quality in potatoes in the San Luis Valley of Colorado.

Here are some of the key findings:

Packout percentages in YaraLiva CN-9 treatment were improved compared to grower standard practice amounting to a $162/acre value.

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Harvested tubers from YaraLiva CN-9 treatment had improved storability at 3 and 6 months in storage.

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Impact of CN-9 on quality in storage

  • YaraLiva CN-9 improved storability in a simulated pile at 3 and 6 months, leading to reduced dry and wet rot, reduced bruising, and increased peak load/reduced susceptibility to pressure bruise.
  • Tubers were analyzed for pressure bruise, shrink, and rot in a simulated pile. Samples were placed in the crib and cushioned with other russet tubers. Pile pressure was applied to the sample tubers using a water tank. Empty, half full, and full tanks were placed in cribs to induce pile pressure. Samples were analyzed after 3 and 6 months.

Nutrient content was also improved in the YaraLiva CN-9 treatment compared to the grower standard.

  • Peel content of P, K, Zn, Fe, Mn, Cu was higher
  • Tuber content of Zn, Fe, Mn, Cu, and B was higher

Spoon feeding YaraLiva CN-9 beginning at tuber initiation and throughout the season provided a predictable and available source of nitrogen and a consistent source of available calcium. This can lead to healthier, more robust plants and healthier roots, particularly under heat stress - improving plant and root vigor, nutrient uptake, and movement from leaves and stems to tubers.

Study Basic Information

  • Target crop: potato
  • Variety: Russet Norkotah 278
  • Location: Monte Vista, CO
  • Product: YaraLiva CN-9
  • Trial date: 2021
  • Researcher: Dr. Sastry Jayanty, Colorado State University





Grower Standard


To meet N needs of crop

Spoon-fed through pivot. N balanced with Yara treatment.


YaraLiva CN-9



68 gpa


To balance N with control

Applied starting at TI and spoon-fed through pivot.

N balanced with control.


Contact your Yara representative to learn more about this trial and discuss how to incorporate YaraLiva CN-9 into your crop's fertility program.

Erika Wagner
Erika Wagner
Agronomy Solutions Manager
Ally Latham
Ally Latham
Sales Agronomist

Southeast Arizona, Colorado, New Mexico, Nebraska Panhandle 

Neil Iverson
Neil Iverson
Sales Agronomist

Red River Valley of Minnesota, North Dakota