Change Site
Growers
Go Search
cancel
cancel
Thank you for signing up for eNews and/or creating an Almond Profile.
Your sign-up is complete.


 Categories



Recent Issues
[+]  April 2014
[+]  March 2014
[+]  February 2014
[+]  January 2014
[+]  December 2013
[+]  November 2013
[+]  October 2013
[+]  August 2013
[+]  July 2013
[+]  June 2013
[+]  May 2013
[+]  April 2013
[+]  March 2013
[+]  February 2013
[+]  January 2013
[+]  December 2012
[+]  November 2012
[+]  October 2012
[+]  August 2012
[+]  July 2012
[+]  June 2012
[+]  May 2012
[+]  April 2012
[+]  March 2012
[+]  February 2012
[+]  January 2012
[+]  December 2011
[+]  November 2011
[+]  October 2011
[+]  August 2011
Past Issues
Search:

Make Nitrogen Fertilizer Rate Adjustments in May

According to the new almond fertility protocol that is revolutionizing the way almond growers apply nitrogen fertilizers throughout the year, May is the time to make in-season adjustments to nitrogen budgets on the basis of April sampling results and adjusted yield predictions.

Under the new nitrogen (N) management protocol posted on the Almond Board website (note revised calculations on page 6 and 7) and discussed in previous issues of California Almonds Outlook, growers establish a preseason nitrogen fertilization plan based on predicted yields and all potential sources of N. From there, April tissue sampling results, along with early-season yield estimates, are used to fine-tune that nitrogen budget and make in-season adjustments.

By May, growers will have received lab results from April leaf tissue analysis, and can make adjustments in N rate through kernel fill according to those results.

By May, growers will have received lab results from April leaf
tissue analysis, and can make adjustments in N rate through
kernel fill according to those results.
In years of lower-than-expected yield with adequate April tissue N analysis, a reduction in mid-season N fertilization is suggested, while higher-than-expected yields might require an increase in N applications. Similar adjustments can be made in accordance with sampling results and scenarios, which are included in the protocol.

Lead researcher Patrick Brown (UC Davis, Pomology) has offered four basic scenarios for leaf tissue analysis and yield assessment, and basic strategies for those scenarios. The protocol lays out very simple formulas to make in-season nitrogen application rate adjustments based on whether tissue levels are adequate, low or high as determined by April sampling, and whether visual field estimates for yield in April and May differ from preliminary yield predictions.

In addition, Brown has posted a spreadsheet and other resources for these calculations, which are available for download.
Share this article
Related Articles
Image 01 Image 01 Image 01 Image 01 Image 01 Image 01 Image 01 Image 01 Image 01 Image 01 Image 01 Image 01 Image 01 Image 01 Image 01 Image 01 Image 01
Warning: This link connects to a third party website not associated with the Almond Board of California. The link has been provided solely as a convenience to you and The Almond Board of California assumes no responsibility for the accuracy, quality, safety, or nature of the content on the linked site.
Click Agree to continue to the requested site, or click Decline to return to your most recently viewed Almond Board page.
agree decline