PCC June July 2021 e

More documents

Recommendations

Info

Vineyard Water Management During Drought Years By GEORGE ZHUANG | UCCE Viticulture Farm Advisor, Fresno County From top left to top right: poor and uneven budbreak; stunted shoot growth (Front: Petite Verdot on 5BB rootstock; Back: Cabernet Sauvignon on 1103P rootstock). From bottom left to bottom right: stunted canopy growth on Pinot Gris on Freedom rootstock with suckers pushing vigorously at the base; poor fruit set with excessive berry abscission (all photos courtesy G. Zhuang.) This past winter was a dry year with a total of
Textural Class Available Water (inches) a Root Zone Depth (feet) Allowable Depletion Percentage b Inches c Sandy 0.6 4.5 50 1.4 Loam 1.5 3.5 50 2.6 Clay 2.5 3.5 50 4.4 a b The percentage allowable depletion represents the amount of available water that can be extracted before the next irrigation. To avoid stress, irrigation should occur when 30% to 50% of available water is depleted throughout the root zone. 50% depletion is used in this example. c Values obtained by multiplying available water × root zone depth × percentage allowable depletion. To avoid stress, irrigation must take place after the vineyard has used this amount of water. Table 1: Representative values for available water content, rooting depth and allowable depletions for different soil types. Table is elaborated in Raisin Production Manual (L.P. Christensen 2000). ® The Grower’s Advantage Since 1982 soil moisture much faster at sandier sites. Soil type can be accessed through UC Davis SoilWeb (casoilresource.lawr. ucdavis.edu/gmap/), or can be analyzed through commercial laboratories by collecting representative soil samples at a site. Cover crop and middle row vegetation should be mowed earlier under drought conditions to preserve soil moisture. After understanding the different soil types and their water-holding characteristics, growers need to make the decision for first irrigation based on the soil moisture content, and that can be quite important during the current drought condition. Numerous tools are available for growers to use to measure soil moisture content, the most commonly used method being ‘feel and appearance’, where growers use a shovel or auger to dig out soil samples at different depths and feel the moisture by squeezing the soil in their hand. Currently, growers have access to many inexpensive soil moisture sensors which can help to measure soil moisture in real time. There are mainly two types of soil moisture sensors: one measures soil water tension (e.g., tensiometer or WaterMark) and the other measures soil volumetric water content (e.g., Neutron probe and capacitance ORGANIC Effective Plant Nutrients and Biopesticides to Improve Crop Quality & Yield Contains Auxiliary Soil & Plant Substances Botector ® Biofungicide ® ORGANIC Plant Nutrients & Adjuvants ® GARGOIL INSECT, MITE & DISEASE CONTROL Blossom Protect Bactericide ® Herbicide EC ® Continued on Page 36 For more information, call (800) 876-2767 or visit www.westbridge.com <strong>July</strong> / August <strong>2021</strong> www.progressivecrop.com 35
Page 1 and 2: July / August 2021 Can AI Enhance t
Page 3 and 4: 4 10 16 20 IN THIS ISSUE Can Artifi
Page 5 and 6: ® IMAGINATION INNOVATION SCIENCE I
Page 7 and 8: L Such sporadic information is a li
Page 9 and 10: team will use the ground informatio
Page 11 and 12: solanacearum (CLso)/potato psyllid/
Page 13 and 14: Conclusion Current methods for HLB
Page 15 and 16: July / August 2021 www.progressivec
Page 17 and 18: educing airflow results in reduced
Page 19 and 20: 7:00AM - 8:00AM 8:00AM - 9:30AM 9:3
Page 21 and 22: F warmer (high of 73 degrees F, low
Page 23 and 24: peas, and barley and vetch) led to
Page 25 and 26: INSECT CONTROL FOR LEAFY GREENS & p
Page 27 and 28: I once worked directly with a walnu
Page 29 and 30: there are certainly benefits to mon
Page 31 and 32: THE BEST WAY TO MANAGE PATHOGENS BE
Page 33: huge storage for that,” she said.
Page 37 and 38: elated to the amount of sunlight ca
Page 39 and 40: FOR BETTER SIZE AND COLOR IN TABLE

PCC June July 2021 e

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?