(464) Temperature Relationships in a Mature Orange Orchard between Areas with or without a Partial Permanent Cover Crop

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  • 1 1University of California, Cooperative Extension Tulare Co., Tulare, CA, 93274-9539
  • | 2 2University of California, Cooperative Extension Kern Co., Bakersfield, CA, 93307
  • | 3 3University of California, Davis, LAWR, Hoagland Hall, Davis, CA, 95616
  • | 4 4Columbine Vineyards, Delano, CA, 93215-9597
  • | 5 5University of California, Cooperative Extension, Fresno, CA, 93702

Many citrus growers are hesitant to plant cover crops, particularly perennial types, because of possible increased frost hazard. To quantify the increased risk, temperature relations over a 3-year period were compared between areas in a `Valencia' orange orchard with and without a partial perennial cover crop. The partial perennial cover crop consisted of a mowed perennial planting along the double drip line hoses, and an annually fall-replanted unirrigated strip of groundcover in the middle between the tree rows. This partial perennial cover crop increased the frost hazard compared to uncultivated bare ground even when wind machines were operating.

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