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)
02 May 2025
Agrivoltaics 4.0 is transforming Italian farming: up to 50% water savings, protection from heat, rain, and frost, plus extra income from solar energy. Giampaolo Dal Pane shares insights on orchard innovation in Emilia-Romagna at the Agrivoltaico Tour event.
29 May 2024
According to Alper Kerim, owner of Demir Fresh Fruits, the focus this year will be on the European market: ‘We are able to send large volumes to Europe and transit times are very good for cherries. However, Asian countries remain the biggest buyers.’
12 Dec 2025
In the last decade, Chile turned cherries into a premium export worth over US$ 1.8 billion, driven by ideal climate, advanced technical management and booming Chinese demand. Andean areas of Peru show potential, but would require infrastructure and adapted strategies.
12 Dec 2025
A Ukrainian study shows that a pre-harvest treatment with chitosan and salicylic acid extends sour cherry shelf life up to 30 days, reducing weight loss, defects, and microbial contamination. It enhances fruit storage, quality and marketability post-harvest.
