Agriculture in California

California farms produce 90% of all U.S.-grown avocados, with the great majority being Hass variety.[9] In 2018, the state grew 300 million pounds. Drought and heat can significantly reduce the harvest in some years.[10]

Relative to traditional farming, aquaculture is a small part of California's agricultural economy, generating only $175 million in 2014.[13] Oysters, abalone, mussels, channel catfish, rainbow trout, and salmon are farmed commercially.[14]

The 2020 table grape harvest was worth $2.12 billion[15] while wine grapes brought in $1.7 billion, down 15.3% year-on-year. By weight this was 17% lower versus 2018.[16]

The seriousness of Pierce's disease (Uncinula necator) has been recognized since at least 1859 when Newton B. Pierce discovered it in the northern grape district.[16] Over the next few years he watched it spread to the south. Frederic Bioletti called it the only serious fungal disease the industry suffered from, and so it has remained ever since.[16][17]

For more about wine grapes specifically see § Wine below.

Ferrisia gilli is an ecnomically significant pest of pistachio here.[24] F. gilli was formerly known as a California population of F. virgata, only being studied sufficiently to recognize that it is distinguishable from F. virgata due to its severe impact on pistachio and almond in this state.[24]

By 2006, California produced the second-largest rice crop in the United States,[25] after Arkansas, with production concentrated in six counties north of Sacramento.[26]

California's production is dominated by short- and medium-grain japonica varieties, including cultivars developed for the local climate such as Calrose, which makes up as much as 85% of the state's crop.[27]

California walnuts account for nearly all the walnuts grown in the United States. In 2017, walnut production was the seventh most valuable agricultural commodity in California, valued at $1.59 billion in cash receipts.[28]

The Central Valley of California is one of the world's most productive agricultural regions.[36] More than 230 crops are grown there.[36] On less than one percent of the total farmland in the United States, the Central Valley produces eight percent of the nation's agricultural output by value: US$43.5 billion in 2013.[37] The top four counties in agricultural sales (2007 data) in the U.S. are in California's Central Valley: Fresno ($3.731 billion), Tulare ($3.335 billion), Kern ($3.204 billion), and Merced ($2.330 billion).[38][39]

Its agricultural productivity relies on irrigation both from surface water diversions and from groundwater pumping (wells). About one-sixth of the irrigated land in the U.S. is in the Central Valley.[40] Central Valley groundwater pollution is an ongoing environmental issue in the area.

There are 6,000 almond growers who produced more than 1.8 million tonnes in 2013, about 60 percent of the world's supply.[41][42]

The Salinas Valley, located within Monterey County, is one of the most productive agricultural regions in California. Monterey County grows over 50% of the national production for leaf lettuce, head lettuce, and celery. It also produces significant percentages of the country's broccoli, spinach, cauliflower, and strawberries.[43] The area is also a significant producer of organic produce, with 68,868 acres in cultivation and annual sales of $412,347,000.

The largest overall water users in California are the environment, agriculture and urban/ municipal uses.[2] In an average year, about 40% of California's water consumption, or approximately 34.1 million acre feet (42.1 km³), is used for agricultural purposes. However, the exact proportion of total water usage for agriculture can vary widely between 'wet' and 'dry' years, where in wet years, agriculture is responsible for closer to 30% of total water consumption and in dry years, agriculture is responsible for closer to 60% of total water consumption.[2] Water for agriculture is used to irrigate more than 9 million acres of cropland annually.[48]

Water for agriculture comes from two primary sources: surface water and groundwater. Surface waters include natural lakes, rivers, and streams, as well as large network of human-built reservoirs and a complex distribution system of aqueducts and canals that carry water from the location of the source to the agricultural users.[48] Groundwater aquifers range in depth and accessibility across the state, and historically have been used to supplement surface water supplies in dry years.[49]

California is one of the top five states in water use for livestock. Water withdrawals for livestock use in California were 101-250 million gallons per day in 2010 (0.135-0.344 km³ per year).[50]

Agricultural impacts on water quality concentrate around concerns of the following contaminants: nutrients, pesticides, salts, pollutants, sediment, pathogens, and heavy metals.[51] These contaminants enter water bodies through above-ground surface runoff of rainwater or excess irrigation water, or percolating through the soil and leaching into groundwater.  Water quality concerns affect most regions of the state and tend to be exacerbated during periods of drought.[52]

At present, all irrigated agricultural operations in the State are required to participate in the Irrigated Lands Regulatory Program.[53] The regulatory program began after the California Legislature passed Senate Bill 390 (SB390) in 1990, that eliminated a blanket waiver for agricultural operations to discharge wastewater without any specific environmental standards.[54]

Prior to the arrival of Europeans, the Indigenous peoples of California, with diverse societies mainly reliant on hunter-gatherer methods, practiced seed collection and forest gardening. Some California hunter-gatherer tribes, including the Owens Valley Paiute, developed irrigation.[55]

In the late 1700s, Franciscan missionaries established Spanish missions in California. Like earlier Spanish missions established in Baja California, these missions were surrounded by agricultural land, growing crops from Europe and the Americas, and raising animals originating from Europe. Indigenous workers from Baja California made up a large part of the initial labor force on California missions.[56] In the early 1800s, this flow of laborers from Baja California had largely stopped, and the missions relied on converts from local tribes. By 1806, over 20,000 Mission Indians were "attached" to the California missions. As missions were expected to become largely self-sufficient, farming was a critically important Mission industry. George Vancouver visited Mission San Buenaventura in 1793 and noted the wide variety of crops grown: apples, pears, plums, figs, oranges, grapes, peaches, pomegranates, plantain, banana, coconut, sugar cane, indigo, various herbs, and prickly pear.[57] Livestock was raised for meat, wool, leather, and tallow, and for cultivating the land. In 1832, at the height of their prosperity, the missions collectively owned over 150,000 cattle and over 120,000 sheep. They also raised horses, goats, and pigs.[58]

While the Spanish were the most successful farmers active in California in the early 1800s, they were not the only ones. In 1812, the Russians established Fort Ross in what is now Sonoma County, California, and intended the fort in part as an agricultural supply point for other Russian activity on the west coast. Despite Russian plans for the colony, agriculture at Fort Ross had low yields, significantly lower than the California missions. Inefficient farming methods, labour shortages, coastal fog, and rodents all contributed to limit agriculture at the fort.[59]

The Spanish (1784–1810) and Mexican (1819–1846) governments made a large number of land grants to private individuals from 1785 to 1846. These ranchos included land taken from the missions following government-imposed secularization in 1833, after which the missions' productivity declined significantly. The ranchos were focused on cattle, and hides and tallow were their main products. There was no market for large quantities of beef (before refrigeration and railroads) until the California Gold Rush.

In 1848, before the Gold Rush, the population of CA was approximately 15,000, not counting Native Americans. By 1852, there were over 250,000 people in the state.[60] and by 1870, 560,000 people.[61] This rapid population growth drove an increase in importation of agricultural products, and, within a few years, a massive growth in in-state agriculture. In the first years of the gold rush, the state relied on agricultural imports arriving by ship, from Australia, Chile, and Hawaii. During these years, there was rapid growth in vegetable farming for local markets. This was followed by an expansion of grain farming.[60] A shift in the economic dominance of grain farming over cattle raising was marked by the passage of the California "No-Fence Law" of 1874. This repealed the Trespass Act of 1850, which had required farmers to protect their planted fields from free-ranging cattle. The repeal of the Trespass Act required that ranchers fence stock in, rather than farmers fencing cattle out. The ranchers were faced with either the high expense of fencing large grazing tracts or selling their cattle at ruinous prices.[62][63] By the 1890s, California was 2nd in US wheat production, producing over one million tons of wheat per year,[60] but monocrop wheat farming had depleted the soil in some areas resulting in reduced crops.[64]

Irrigation was almost nonexistent in California in 1850, but by 1899, 12 percent of the state's improved farmland was irrigated.[64]

Luther Burbank moved to Santa Rosa, California in 1875, and developed numerous commercially successful varieties of plants over the next 50 years.

The 1902 Newlands Reclamation Act funded irrigation projects on arid lands in 20 states including California.

In 1905, the California legislature passed the University Farm Bill, which called for the establishment of a farm school for the University of California (at the time, Berkeley was the sole campus of the university).[65] The commission took a year to select a site for the campus, a tiny town then known as Davisville.[65] UC Davis opened its doors as the "University Farm" to 40 degree students (all male) from UC Berkeley in January 1909.

In 1919, the California Department of Food and Agriculture was established. The department covers state food safety, state protection from invasive species, and promoting the state's agricultural industry.

The Dust Bowl of the 1930s drove many people from the American prairie, and a significant number of these economic migrants relocated to California. Poor migrants from Oklahoma and nearby states were sometimes referred to as Okies, generally a pejorative term. In 1933, the state saw a number of agricultural labor strikes, with the largest actions against cotton growers. Cherry, grape, peach, pear, sugar beet, and tomato workers were also involved.

In 1942, the United States began the Bracero program. Lasting until 1964, this agreement established decent living conditions and a minimum wage for Mexican workers in the United States.

In 1965, the Williamson Act became law, providing property tax relief to owners of California farmland and open-space land in exchange for agreement that the land will not be developed.

The 1960s and 1970s saw major farm worker strikes including the 1965 Delano grape strike and the 1970 Salad Bowl strike. In 1975, the California Agricultural Labor Relations Act of 1975 was enacted,[66] establishing the right to collective bargaining for farmworkers in California, a first in U.S. history.[67] Individuals with prominent roles in farm worker organizing in this period include Cesar Chavez, Dolores Huerta, Larry Itliong, and Philip Vera Cruz.

In the 2000s and 2010s, Califorians voted for propositions which established new protections for farm animals. 2008 California Proposition 2 and 2018 California Proposition 12 both established minimum requirements for farming egg-laying hens, breeding pigs, and calves raised for veal. Few veal and pig factory farm operations exist in California, so these propositions mostly affect farmers who raise California's 15 million egg-laying hens.[68]