Sweet cherry farmers in California, aware of the short window to make nitrogen management decisions, are adopting new approaches to maximise yield. Historically relying on leaf sampling and critical values, the project 'Development of a Nutrient Balance and Nutrient Demand Model for Nitrogen Management in Cherry Trees' introduced new fertiliser management tools.
The project demonstrated that adjusting nitrogen applications according to tree demand and seasonal uptake patterns can optimise fertiliser use in mature cherry trees. Nitrogen requirements were calculated based on fruit production and perennial tissue growth, providing useful guidance to growers.
Cherry trees were sampled to determine the nitrogen removal coefficient and the nitrogen required for perennial tissue growth. The results showed variations between cherry varieties, influencing the total nitrogen fertiliser requirements for the season.
To optimise nitrogen efficiency, a strategy was recommended that considers the estimated nitrogen requirements minus available nitrogen from other sources. In addition, applications of organic fertilisers and soil conditioners should be scheduled during the periods of highest nitrogen uptake, from November to September.
| Variety | N Removal Coefficient (lbs. N/1000 lbs. of fresh fruits) |
| Rainier | 2.74 |
| Coral | 2.73 |
| Bing | 2.32 |
| Weighted Average | 2.59 |
| Variety | N for Perennial Growth (lbs. N/acre) |
| Rainier | 28.99 |
| Coral | 28.41 |
| Bing | 27.51 |
| Weighted Average | 28.30 |
The impact of the project is significant, promising to set new standards for nitrogen management in cherry trees. Synchronising fertiliser applications with tree demand and seasonal uptake patterns can optimise fertiliser use and significantly reduce nitrogen losses. These findings are shared with growers through the Cherry Board of California and the University of California Fruit and Nuts website, helping to improve agricultural practices in the region.
To learn more about this project and other ongoing and completed FREP projects, visit the website: https://www.cdfa.ca.gov/is/ffldrs/frep/Research.html.
Read the full article: California Department of Food and Agriculture (CDFA)
Table and images: California Department of Food and Agriculture (CDFA)
06 Jun 2024
The aim of this renewal is to adapt the visual identity of the PDO to an increasingly digital world. The Regulatory Council renews the corporate image by launching a new logo, representing both cherries and PDO picotas.
12 Mar 2024
A study conducted in Spain evaluated the impact of the simultaneous application of MAP and two antagonistic yeasts on the shelf life of early “Burlat” cherries. The use of these yeasts induced changes in the quality of the fruit as an increase in the solids content was observed.
17 Dec 2025
A Spain-Denmark study reveals the molecular pathways behind sweet cherry bud dormancy release. The research highlights the roles of hydrogen cyanamide, jasmonates and cytokinins in helping fruit trees adapt to climate change effects on flowering.
17 Dec 2025
Japanese cherry blossom trees bloom from March to April, but not all produce edible cherries. Learn the difference between ornamental and fruiting cherry trees, discover the most iconic varieties and where to see them—from Tokyo to Washington D.C.
