Nitrogen Fertilization Recommendation 

for Walnut

 

P.H. Brown and Q.Zhang, Pomology Department, University of California, Davis
Max Stevenson, UC-SAREP program
R.C.Rosecrance, College of Agriculture, California State University, Chico
Funding for this project was provided through the CDFA-FREP program 
and the UC Sustainable Agriculture Program.

 

                                                                                                                        

This model calculates the N requirement for Walnut production based upon the yield history, current conditions and previous N applications. This model can be used to calculate both timing and rate of fertilizer application required to maintain optimum yield. Site specific information is required for accurate projection of N requirement hence this model should be applied to each distinct management unit (block or field).

    The data used in this model was derived from exhaustive tree-N budget determinations and input from Max Stevenson, BIOS staff Scientist at the Community Alliance with Family Farmers (www.caff.org)

Attention

This program provides recommendations only and is not intended to be used as the sole source of information for making N fertilization decisions.  Local environmental conditions can have a profound effect of fertilizer demands.  CDFA-FREP and the University of California are not responsible for the accuracy of this model.