Almond Rootstock Options for High Boron Conditions PDF
Preview Almond Rootstock Options for High Boron Conditions
Almond Rootstock Options for High Boron Conditions Kat Pope Orchard Advisor, Sac-Solano-Yolo February 7th, 2017 Talk outline • Almond boron basics • Almond rootstock trial results: yields, what may be driving yield differences, practical take-aways • Triage for what’s already planted Top Three • 2,000+ lbs/ac is possible in high B conditions IF you pick the right rootstock. (6th leaf) • Lovell and Krymsk 86 yield low in high B conditions. • If a not great rootstock is already in the ground, leach in the winter, set a crop early and watch for Bot. Boron Toxicity in Almond •No leaf symptoms. •Brown-black dead lesions on bark •Tip die-back •Boron accumulation in fruit •Gumming on fruits and bark •Increased stick tights Slide Credit: Patrick Brown Rootstock Trial Site and Set-Up Marvin silty clay loam 41% clay, 48% silt Water: <1 - 3.1 mg/l B Soil: 1.3-2.2 mg/l B Credit & Thanks: 9 Rootstocks w/ Nonpareil Host: Dave Scheuring, Gold Oak Ranch Funding: Almond Board of California Nursery grafted All Bareroot except Brights Planted: Feb, 2011 (Titan Apr 2011 not rep’d) Spacing: 22’ x 18’ (110 trees/ac) Rootstock Trial Site and Set-Up Marvin silty clay loam Rootstock Origin 41% clay, 48% silt Titan SG1 Peach-Almond Water: <1 - 3.1 mg/l B FxA Peach-Bitter Almond Soil: 1.3-2.2 mg/l B Nickels Peach-Almond 9 Rootstocks w/ Nonpareil Brights 5 Peach-Almond Hansen 536 Peach-Almond Nursery grafted Rootpac-R Myro Plum-Almond All Bareroot except Brights Viking Pch-Alm-Myro-Apr Planted: Feb, 2011 Krymsk 86 Myro Plum-Peach (Titan Apr 2011 not rep’d) Lovell Peach Spacing: 22’ x 18’ Rootstock Trial Site and Set-Up Marvin silty clay loam Rootstock Origin 41% clay, 48% silt Titan SG1 Peach-Almond Water: <1 - 3.1 mg/l B FxA Peach-Bitter Almond Soil: 1.3-2.2 mg/l B Nickels Peach-Almond 9 Rootstocks w/ Nonpareil Brights 5 Peach-Almond Hansen 536 Peach-Almond Nursery grafted Rootpac-R Myro Plum-Almond All Bareroot except Brights Viking Pch-Alm-Myro-Apr Planted: Feb, 2011 Krymsk 86 Myro Plum-Peach (Titan Apr 2011 not rep’d) Lovell Peach Spacing: 22’ x 18’ Yield Varied with Rootstock 2,500 2015 2016 a a 2,000 ab e r c bc A 1,500 r e P cd s de b L l1,000 e ef n r e f K 500 0 Yield Varied with Rootstock 2,500 2015 2016 a a 2,000 ab e r c bc A 1,500 r e P cd s de b L l1,000 e ef n r e f K 500 0 Yield Varied with Rootstock 2,500 2015 2016 a a 2,000 ab e r c bc A 1,500 r e P cd s de b L l1,000 e ef n r e f K 500 0
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