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Continued from Page 25<br />
control trees to delay trees. The control treatment consisted of irrigation<br />
initiation based on a grower standard typically related to soil moisture meters<br />
and/or leaf out. The delay treatment in turn utilized SWP measurements of<br />
approximately 2 to 3 bars below baseline to initiate irrigation, which didn’t<br />
trigger until the first week of June (site dependent). Yield measurements<br />
between treatments showed no significant differences, yet trees in the delay<br />
treatments appeared to improve in general overall health over time. Field trials<br />
have been extended to a few other counties, including Stanislaus, to incorporate<br />
variation across walnut growing regions in CA. Research is ongoing, and<br />
currently funded by the California Walnut Board.<br />
Biological Controls for<br />
Anthracnose, Alternaria, N.O . W.,<br />
and more...<br />
How Much do I Water?<br />
So, how much do I water? Weekly<br />
updates of crop water use are<br />
available. This information is<br />
provided by UCCE and the<br />
Department of Water Regulations<br />
(DWR). Evapotranspiration is<br />
calculated for a limited number<br />
of different crops at multiple<br />
sites throughout California and<br />
appropriated in finer detail to<br />
specific locations using CIMIS<br />
weather stations. These tables can<br />
then be used as guides to know<br />
how much water to apply. SWP<br />
can be used to fine tune how often<br />
irrigation is applied and how much<br />
by measuring tree stress before<br />
and after irrigations. For more<br />
information on any of these topics,<br />
please contact your local UCCE<br />
farm advisor. Additionally, for a<br />
video demonstration on how to use<br />
a pressure chamber, please follow<br />
this link: https://www.youtube.com/<br />
watch?v=M6ZkmB1ld60.<br />
Comments about this article?<br />
We want to hear from you.<br />
Feel free to email us at<br />
article@jcsmarketinginc.com<br />
Mid Valley Nut Conf.<br />
Visit us in Booth #25<br />
marronebio.com<br />
26<br />
West Coast Nut September 2018
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