The following are assumptions pertaining to sample costs of establishing an almond orchard and pr... more The following are assumptions pertaining to sample costs of establishing an almond orchard and producing almonds in the Northern San Joaquin Valley. Practices described are not recommendations by the University of California, but represent production procedures and materials considered typical of a well managed orchard for the Northern San Joaquin Valley. Costs and practices detailed in this study may not be applicable to all situations. Establishment and cultural practices vary by grower and region; variations can be significant. These costs are on an annual, per acre basis. The use of trade names in this report does not constitute an endorsement or recommendation by the University of California nor is any criticism implied by omission of other similar products.
Two configurations of subsurface drip were installed 16 inches deep: a single lateral line, 2 fee... more Two configurations of subsurface drip were installed 16 inches deep: a single lateral line, 2 feet from the tree row, and two lateral lines per tree row, each 4 feet from the trees. Summer weeds grow according to the wetting patterns of the microirrigation patterns. The microsprinklers in the foreground encourage more weeds than the subsurface drip in the back.
Greenhouse gas emissions from agriculture and forestry in California are estimated at approximate... more Greenhouse gas emissions from agriculture and forestry in California are estimated at approximately 8.3% of the total production of 493 million metric CO 2-equivalent tons (California Energy Comission (CEC); Research Roadmaps for Greenhouse Gas Inventory Methods; Sacramento, CA, 2005), of which nitrogen (N) fertilizers applied to soils and soil management are estimated to be the major sources of N 2 O production. Of the approximate 3.89 million hectares (ha) of intensively irrigated cropland in California (California Department of Water Resources (DWR); Agricultural Water Use; Sacramento, CA, URL http://www.water.ca.gov/wateruseefficiency/agricultural/), approximately 1.17 million ha are planted to orchards and vineyards. This acreage is irrigated and fertilized with N using microirrigation systems and liquid N fertilizers (fertigation). Understanding biophysical factors that regulate N 2 O emissions during fertigation will be necessary for scaling exercises, and
The following are assumptions pertaining to sample costs of establishing an almond orchard and pr... more The following are assumptions pertaining to sample costs of establishing an almond orchard and producing almonds in the Northern San Joaquin Valley. Practices described are not recommendations by the University of California, but represent production procedures and materials considered typical of a well managed orchard for the Northern San Joaquin Valley. Costs and practices detailed in this study may not be applicable to all situations. Establishment and cultural practices vary by grower and region; variations can be significant. These costs are on an annual, per acre basis. The use of trade names in this report does not constitute an endorsement or recommendation by the University of California nor is any criticism implied by omission of other similar products.
Orchard and vineyard producers conduct preplant site evaluations to help prevent planting permane... more Orchard and vineyard producers conduct preplant site evaluations to help prevent planting permanent tree and vine crops on lands where the crop will not perform to its highest potential or attain its full life expectancy. Physical soil characteristics within specific soil profiles and spatially throughout an orchard influence decisions on land preparation, irrigation system selection, horticultural choices, and nutrient management. Producers depend on soil surveys to help them understand the soil characteristics of the land and may be interested in technology that provides additional information. Electromagnetic induction (EM38) and four-probe soil resistance
... Yuba Kathy Kelley, Contra Costa, Colusa, Lake, Sutter-Yuba Bill Krueger, UCCE Tehama Bill Ols... more ... Yuba Kathy Kelley, Contra Costa, Colusa, Lake, Sutter-Yuba Bill Krueger, UCCE Tehama Bill Olson, UCCE Tehama Russ Stocker, ARENA ... Student, Division of Insect Biology, UC Berkeley; R. Buchner, is County Directors and Farm Advisors, UCCE Tehama, Glenn and Butte ...
ABSTRACT Fertilizer use in California agriculture has been under recent scrutiny regarding its im... more ABSTRACT Fertilizer use in California agriculture has been under recent scrutiny regarding its impacts on air, surface water and groundwater quality. In June 2007, we surveyed almond growers to assess their plant nutrition practices, identify opportunities for improvement, and target research and extension needs. The majority of respondents, particularly those with large almond acreages, used fertigation to apply nitrogen; applied nitrogen coincident with periods of maximal plant demand; and collected annual tissue samples for analysis. While the survey results suggested broad compliance with the best-available management practices and are likely to indicate good nutrient-use efficiency, they also suggested that growers are uncertain about current practices to monitor orchard nutrient status and would value additional information to enable greater precision in fertilization rates and timing.
Uploads
Papers by John Edstrom