California Agriculture

California farmers who use reduced-disturbance tillage and winter cover cropping can boost production and improve soil health. However, some farmers are hesitant to try these conservation practices due to uncertainty about whether planting winter cover crops will deplete soil moisture in already drought-stricken regions. Our study addresses these concerns by looking at how long-term reduced-disturbance tillage and winter cover cropping, compared to fallowed soils with standard tillage, affected soil moisture. Although we found a statistical difference in total soil water content, the difference was only about 0.3 inches of water per foot of soil. On average, the soil water content of the top 0–96 inches was highest for the reduced-disturbance fields with winter cover crops. This was especially evident during our driest field season, from November 1, 2017, to March 15, 2018, when cumulative rainfall was only 1.9 inches. Our findings show that winter cover cropping and reduced-disturbance tillage can improve soil without depleting soil water levels in row crops.

“Africanized” honey bees (AHB) have been part of California’s agricultural and natural landscapes for nearly three decades. Prior to their arrival in 1994, leading honey bee experts expressed concern over the potentially disastrous impact of AHB on California agriculture and public safety. Despite these concerns, the state’s agricultural production has not been significantly impacted by AHB. However, some evidence suggests that the abundance of AHB in natural habitats can have negative consequences for native pollinators. At the same time, AHB may provide a genetic resource for improving managed honey bee health. We recommend updating the term “Africanized” honey bees to more accurately reflect their biology and to avoid unfortunate connotations.

Food-safety incidents are costly for everyone in the leafy greens industry. However, it is challenging to estimate the size and distribution of these costs in today’s complex supply chains. Extensive use of formal contracts in markets such as leafy greens obscures prices and other terms of trade from the public view. Using proprietary data on prices and sales from a major leafy greens processor operating in the retail and food-service sectors, we were able to separately estimate short-run damages associated with the November 2018 romaine Escherichia coli advisory for grower-shippers, processors, retailers, and food-service operators. Due to fixed prices in grower-processor contracts, growers were only minimally impacted by the advisory. Processors, meanwhile, lost approximately $55.3 million from price and quantity impacts. Retailers incurred $14.1 million in losses after pulling product from distribution channels and shelves. Food service operators were less impacted because lower prices offset losses from destroying potentially contaminated products. Moving forward, the best way to mitigate losses during food-safety incidents is fast and efficient traceability.

Public speaking is an essential skill for the workforce, yet many professionals lack confidence when speaking in front of an audience. While the 4-H Youth Development Program helps young people learn and practice public speaking, little is known about which specific 4-H activitiesfoster these skills. We conducted a study to explore 4-H members' public speaking confidence and to identify specific 4-H activities that bolster young people’s public speaking confidence. Quantitative and qualitative survey analyses revealed that, regardless of age, the longer 4-H members spend in the program, the more their self-confidence in public speaking improves. The 4-H program offers unique opportunities for public speaking at club meetings and formal presentations. There is room to expand these opportunities by offering youth more instructional “how to present” materials and increasing low-stakes speaking venues.