Krav på jordprovtagning i Kalifornien

Q: Hur ofta behöver man ta jordprover i Kalifornien?

Central Valley Water Board, Dairy General Order (avfallsutsläppskrav för befintliga mjölkkomejerier) (villkorlig regel): En gång vart 5:e år från varje markansökningsområde. Kan spridas över 5 år genom att 20 procent av områdena provtas varje år. University of California Cooperative Extension, riktlinjer för jordprovtagning (officiell vägledning): Allmän fertilitet: vart 3:e år är vanligt. Nitrat-N: varje år, före plantering eller gödsling.

Statliga regler: Central Valley Regional Water Quality Control Board Order R5-2013-0122, Återutfärdad allmän förordning om avloppsutsläpp för befintliga mjölkkomejerier. Statliga riktlinjer: University of California Cooperative Extension, riktlinjer för jordprovtagning.

Jordprovtagning i Kalifornien: frekvens, area, djup och kärnprovtagning

Hur ofta behöver man ta jordprover i Kalifornien?

Central Valley Water Board, Dairy General Order (waste discharge requirements for existing milk cow dairies) Conditional Once every 5 years from each land application area. May be spread over 5 years by sampling 20 percent of the areas each year.
University of California Cooperative Extension, guidelines for soil sampling Official guidance General fertility: every 3 years is common. Nitrate-N: every year, preplant or before fertilization.

När på året bör jordprover tas i Kalifornien?

University of California Cooperative Extension, guidelines for soil sampling Official guidance Spring or fall, at the same time each year, not after fertilizer.

Hur djupt bör jordprover tas i Kalifornien?

University of California Cooperative Extension, guidelines for soil sampling Official guidance General fertility: 6 inches or tilling depth. Nitrate-N: 6 inches to 3 feet, by rooting depth and leaching risk.

Hur många kärnor går det till ett jordprov i Kalifornien?

University of California Cooperative Extension, guidelines for soil sampling Official guidance At least 20 cores per block.

Soil sampling rules in California, with the exact wording of each source
Country / region	Purpose / programme	Time / frequency	Area per sample	Method	Depth	Cores	Status and source
United States
CaliforniaUnited StatesCalifornia, Central Valley Region only: existing milk cow dairies under Order R5-2013-0122. Other regions and states set their own rules.	Soil phosphorus monitoring on dairy land application areasCentral Valley Water Board, Dairy General Order (waste discharge requirements for existing milk cow dairies)	Repeat Once every 5 years from each land application area. May be spread over 5 years by sampling 20 percent of the areas each year.	Not specified	Not specified	Not specified	Not specified	ConditionalCentral Valley Water Board Order R5-2013-0122 with Monitoring and Reporting Program (PDF)
Who it applies to, the exact wording and every source Who it applies to Existing milk cow dairies in the Central Valley Region covered by the General Order, on each land application area. Laboratory and analysis Laboratory analysis for soluble phosphorus. Spring and fall pre-plant nitrate, organic matter and other tests at 0 to 1 foot and 1 to 2 feet are recommended but not required. In force from Under review Legal text Central Valley Regional Water Quality Control Board Order R5-2013-0122, Reissued Waste Discharge Requirements General Order for Existing Milk Cow Dairies, Monitoring and Reporting Program, Table 2 (Nutrient Monitoring, Soil) The wording in the source Timing Once every 5 years from each land application area (may be distributed over a 5-year period by sampling 20% of the land application areas annually): MRP, Table 2 Nutrient Monitoring, Soil Who it applies to REISSUED WASTE DISCHARGE REQUIREMENTS GENERAL ORDER FOR EXISTING MILK COW DAIRIES Order title page all Dischargers specified by the Central Valley Water Board and all Dischargers that were formerly regulated under the original version of Order R5-2007-0035 adopted in May 2007, their agents, successors, and assigns shall comply with the following: Order, operative paragraph after Finding 44 Laboratory and analysis Laboratory analyses for soluble phosphorus MRP, Table 2 Nutrient Monitoring, Soil The following soil tests are recommended but not required: MRP, Table 2 Nutrient Monitoring, Soil Sources Central Valley Water Board Order R5-2013-0122 with Monitoring and Reporting Program (PDF) Law Sources re-checked every two months, last update October 2026. Reviewed by GeoPard editorial team.
CaliforniaUnited StatesCalifornia only. Other states set their own rules.	General fertility and nitrate samplingUniversity of California Cooperative Extension, guidelines for soil sampling	Repeat General fertility: every 3 years is common Season Spring or fall, at the same time each year, not after fertilizer Repeat Nitrate-N: every year, preplant or before fertilization	Not specified	W-shaped pattern, a zigzag across the whole block, or a diagonal line. Divide non-uniform fields into blocks by cropping history and varieties, observed differences in crop development, and soil series.	General fertility: 6 inches or tilling depth. Nitrate-N: 6 inches to 3 feet, by rooting depth and leaching risk.	At least 20 cores per block	Official guidanceUCCE, Guidelines for Soil Sampling (PDF, UC ANR)
Who it applies to, the exact wording and every source Who it applies to Advice for California growers from University of California Cooperative Extension (UC Agriculture and Natural Resources). Not law. In force from Under review Legal text UC Cooperative Extension (Small Farms Advisor, Yolo, Solano and Sacramento Counties), Guidelines for Soil Sampling The wording in the source Timing Frequency: every 3 years is common, best to do before crops with high demands ( ex. Tomatoes have a high K demand), between the same crops in crop rotation For general fertility testing Best to do in the spring or fall For general fertility testing Do not sample after fertilizer has been added For general fertility testing Conduct samples the same time year after year For general fertility testing Frequency: every year; preplant, before fertilization or both For Nitrate-N testing Method Sample in a W-shaped pattern, by walking a zigzag course across the entire block, or walking a diagonal line Principles, Representative Divide non-uniform fields into blocks, based on Principles, Uniformity Cropping history, varieties Principles, Uniformity, first bullet Observed differences in crop development yield Principles, Uniformity, second bullet Differences in soil series (SoilWeb Ap) Principles, Uniformity, third bullet Depth Sampling depth should be 6” or the tilling depth For general fertility testing Depth: 6” to 3’, depending on the rooting depth and risk of leaching between sampling and phase of high crop uptake For Nitrate-N testing Cores Take a minimum of 20 cores for the block, which are mixed in 1 clean bucket, from which a single subsample is removed for lab testing Protocol, Taking a soil sample Sources UCCE, Guidelines for Soil Sampling (PDF, UC ANR) Guidance Sources re-checked every two months, last update October 2026. Reviewed by GeoPard editorial team.

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Krav på jordprovtagning i Kalifornien

Krav på jordprovtagning i Kalifornien

Jordprovtagning i Kalifornien: frekvens, area, djup och kärnprovtagning

Hur ofta behöver man ta jordprover i Kalifornien?

När på året bör jordprover tas i Kalifornien?

Hur djupt bör jordprover tas i Kalifornien?

Hur många kärnor går det till ett jordprov i Kalifornien?

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The wording in the source

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