Cover crop research review: How can it help almonds?

Cynthia Crézé (1), Jeffrey Mitchell (1), Andreas Westphal (2), Danielle Lightle (3), David Doll (3), Mohammad Yaghmour (3), Neal Williams (4), Amanda Hodson(4), Houston Wilson (5), Kent Daane (6), Brad Hanson (1), Steven Haring (1), Cameron Zuber (3) & Amélie Gaudin (1) Department of Plant Sciences, University of California – Davis Department of Nematology, University of California – Riverside University of California Agriculture and Natural Resources – Cooperative Extension Department of Entomology and Nematology, University of California – Davis Department of Entomology, University of California – Riverside Department of Environmental Science, Policy and Management, University of California – Berkeley Although cover cropping is compatible with almond production and is often implemented in other orchard systems, this practice has never been widely implemented in California. The potential benefits are recognized by growers, especially their value for pollinator forage and soil health but operational concerns, lack of cost-benefit analyses and unclear best management practices have hampered wide adoption. As cover cropping can provide significant sustainability benefits, there is an urgent need to assess and develop feasible and beneficial cover crop systems for California almond production. Here is some insight gathered by a research team assessing the impacts of multiple cover crop management strategies on: 1) soil health, 2) water use and dynamics, 3) bee visitation and pollination, 4) weed and pest pressure (NOW) and 5) almond yields in four orchards across the Central Valley precipitation gradient. Cover crop research trial in almond: Project website: https://almondcovercrop.faculty.ucdavis.edu Design: Three commercial orchards in Corning (Tehama county, 2nd leaf), Merced (Merced county, 16th leaf) and Arvin (Kern county, 16th leaf). One experimental station: Kearney (Fresno county). Two cover crops: Soil Mix (2 legumes, 2 brassicas & 1 grass), Pollinator Mix (5 brassicas, Project Apis M – https://www.projectapism.org/pam-mustard-mix.html) Compared to resident vegetation & to bare soil. Cover

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Orchard Cover Cropping pt 1

Written by: Jessica Corcorran, Pomology Intern, UCCE Merced County Jessica was selected by a committee to serve in the Summer Pomology Internship Program funded by the Almond Board of California. Being assigned within Merced County, she is working on several research projects, attending farm calls, and getting a feel for what it takes to be an extension agent. It is our hope that her career path will lead to extension work, hopefully serving the almond industry within California. She is entering her Senior Year at Cal Poly. The use of orchard cover crops is not a new practice. The benefits of cover crops have long been recognized and have been widely used in agriculture. In recent years, cover crop use has increased due to a multitude of reasons which include soils health improvement, increased soil fertility, and increased water retention and penetration. In today’s post, I will cover the impacts of cover cropping on soil health. In subsequent posts, I will discuss other benefits of cover cropping, general pros and cons, as well as the practicalities of implementing a cover crop in an orchard.   Cover crops have the ability to greatly improve soil quality and structure. Water penetration is often compromised by soil compaction in orchard soils.  The roots of the cover crop and their ability to move through the soil can help to reduce soil compaction by tillage and harvesting equipment.  Plow pans have even shown to be corrected by the use of cover crops. The fibrous roots of the cover crop also help to stabilize soil aggregates, which improve soil structure and aids in effective water infiltration. The addition of organic matter in the soil invites beneficial microorganisms. During the breakdown of organic matter, indigestible compounds are formed that are resistant to decomposition. These compounds bind soil particles

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