Management Options for Agricultural Water Quality University of California Cooperative Extension County of San Diego.

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Presentation transcript:

Management Options for Agricultural Water Quality University of California Cooperative Extension County of San Diego

Presentation Outline Irrigation Nutrients Erosion and Runoff Non-production Areas

Irrigation 1. Irrigation uniformity and efficiency o 1.1 Irrigation audit to determine efficiency and make changes o 1.2 Schedule regular audits o 1.3 If uniformity is low, consider converting to new irrigation system o 1.4 Use pressure regulators

Irrigation 1. Irrigation uniformity and efficiency cont. o 1.5 Use pressure compensating emitters o 1.6 Compensate for pressure differences on slopes o 1.7 Flow control nozzles on overhead systems o 1.8 Similar flow rates in each watering zone

Irrigation 1. Irrigation uniformity and efficiency cont. o 1.9 Group plants by size and water needs o 1.10 Correlate flow rates with plant type, media infiltration rate and pot size o 1.11 Use appropriate and uniform nozzle sizes o 1.12 Use sprinkler heads with high uniformity rating

Irrigation 2. Maintain system regularly o 2.1 Regularly inspect for leaks and repair o 2.2 Regularly flush and unclog lines and emitters o 2.3 Use and maintain appropriate filters o 2.4 Maintain appropriate pressure o 2.5 Regularly replace worn, outdated or inefficient system components

Irrigation 3. Avoid unnecessary or poorly placed watering o 3.1 Space plants closely with overhead irrigation o 3.2 Ensure every emitter is located in a plant or pot o 3.3 Consolidate plants and shut off irrigation in unused areas

Irrigation 3. Avoid unnecessary or poorly placed watering cont. o 3.4 Use overhead emitters with check-valves o 3.5 Use on/off valve in hand watering systems o 3.6 Check regularly to ensure spray delivers water to plants only

Irrigation 4. Irrigation rates and scheduling o 4.1 Base irrigation scheduling on environmental conditions and plant moisture requirements o 4.2 Adjust irrigation schedule to reflect weather, plant needs o 4.3 Group plants according to moisture need

Irrigation 4. Irrigation rates and scheduling cont. o 4.4 Avoid irrigation outdoors in wind o 4.5 Use pulse irrigation o 4.6 Check automatic time clocks regularly for accuracy and adjust

Irrigation 5. Training o 5.1 Ensure that irrigation is only performed by trained personnel o 5.2 Provide system maintenance and recordkeeping training o 5.3 Provide in-house audit training o 5.4 Keep records of training

Nutrients 1. Evaluation to optimize plant growth o 1.1 Regularly monitor the quality of irrigation source water o 1.2 Test well water regularly for contamination from fertilizers o 1.3 Maintain records of irrigation source water quality o 1.4 Consider nutrients already present when managing fertilizer application

Nutrients 1. Evaluation to optimize plant growth cont. o 1.5 Regularly test soil for nutrients, soluble salts and pH o 1.6 Test plant tissue for nutrients o 1.7 Use data from soil/plants in fertilizer management

Nutrients 1. Evaluation to optimize plant growth o 1.8 Use nutrient recommendations for your specific crop o 1.9 Regularly test fertigation water o 1.10 Maintain records of fertilizer use

Nutrients 2. Efficient fertilization and leaching o 2.1 Incorporate solid fertilizers to optimize nutrient availability to roots o 2.2 Use thoroughly composted compost and manure o 2.3 Apply top-dressed fertilizers carefully to keep in pot o 2.4 Mix and apply injected fertilizers carefully and at the correct rate

Nutrients 2. Efficient fertilization and leaching cont. o 2.5 Calibrate fertilizer injectors o 2.6 Use slow- or controlled-release fertilizers o 2.7 Time fertilizers with environmental parameters and growth stage of plants o 2.8 Flush excess salts from root systems by careful leaching

Nutrients 2. Efficient fertilization and leaching cont. o 2.9 Use the electrical conductivity of root media to determine leaching practices o 2.10 Set irrigation schedules to perform leaching at specific irrigation events o 2.11 Measure amount of leaching and ensure only 10-15% of water runs out

Nutrients 3. Avoid fertilizer spills o 3.1 Store fertilizers in structure that complies with government guidelines o 3.2 Locate fertilizer storage far away from water conveyances o 3.3 Include concrete pad and curb to contain spills and leaks o 3.4 Equip fertilizer tanks with secondary containment

Nutrients 3. Avoid fertilizer spills cont. o 3.5 Mix and load fertilizer on an impermeable surface o 3.6 Regularly verify that fertigation equipment is calibrated and intact o 3.7 Cover fertilizer while transporting and do not overfill o 3.8 Take care not to spill fertilizer while transferring to applicator or storage

Nutrients 3. Avoid fertilizer spills cont. o 3.9 Clean spills immediately o 3.10 Use check valves on application equipment o 3.11 Use backflow prevention o 3.12 Dispose of fertilizer bags in covered trash bins

Nutrients 4. Training o 4.1 Train in how and when to fertilize o 4.2 Train in how and when to leach o 4.3 Train in fertilizer transport, storage and disposal o 4.4 Train in fertilizer spill management o 4.5 Keep records of training

Erosion and Runoff 1. Evaluate water quality of runoff o 1.1 Inventory chemicals used in your operation o 1.2 Regularly sample runoff water o 1.3 Analyze runoff water for pH, EC, N, P, etc o 1.4 Compare water quality against local and state water quality standards o 1.5 Keep water quality records

Erosion and Runoff 2. Maximize soil infiltration and water- holding capacity o 2.1 Incorporate organic amendments in sandy soil to improve water capacity o 2.2 Incorporate organic amendments in clayey soil to improve infiltration o 2.3 Use mulches or cover crops o 2.4 Test media for water holding capacity o 2.5 Use wetting agents in media

Erosion and Runoff 3. Retard and/or retain runoff water o 3.1 Determine where and how much erosion and runoff is generated o 3.2 Establish barriers or buffers between production areas and waterbodies/ditches o 3.3 Convert paved or bare soil to vegetation o 3.4 Use polyacrylamide to remove sediment in runoff

Erosion and Runoff 3. Retard and/or retain runoff water cont. o 3.5 Use windbreaks/shelterbelts in areas prone to wind erosion o 3.6 Contain runoff from upslope or upstream properties o 3.7 Keep records of runoff management

Erosion and Runoff 4. Manage hilly/sloped areas o 4.1 Use terraces o 4.2 Use mulch on hilly or steep areas o 4.3 Use vegetation (cover crops, buffer strips, grassed swales, etc)

Erosion and Runoff 4. Manage hilly/sloped areas cont. o 4.4 Use berms o 4.5 Use proper irrigation in hilly production and non-production areas o 4.6 Use proper pest and nutrient management in hilly areas

Erosion and Runoff 5. Design/Manage nursery roads o 5.1 Design new roads to avoid erosion o 5.2 Use waterbars on roads with gradients exceeding 8% o 5.3 Use filter strips between roads and waterways o 5.4 Inspect and clean culverts during winter rains o 5.5 Seal or water unpaved roads

Erosion and Runoff 6. Collect excess runoff o 6.1 Use retention basins to store excess runoff o 6.2 Use captured water to irrigate non-crop areas o 6.3 Use captured water to irrigate cropped areas

Erosion and Runoff 7. Manage greenhouse roof runoff o 7.1 Direct roof runoff to avoid flow across areas where contaminants will wash into water o 7.2 Direct roof runoff to pervious areas o 7.3 Reuse collect roof runoff for irrigation

Erosion and Runoff 8. Training o 8.1 Provide training to runoff management o 8.2 Make staff aware of all drainage conduits and ditches on property o 8.3 Label all stormwater and sewer conduits with signs o 8.4 Keep records of training

Non-Production Areas 1. Prevent dry or wet weather runoff o 1.1 Clean indoor walkways, loading areas, etc using “dry” methods, or contain runoff from wet cleaning o 1.2 Periodically clean outdoor areas using “dry” methods, or contain runoff from wet cleaning

Non-Production Areas 2. Maintain vehicles and their storage o 2.1 Regularly maintain vehicles to detect/prevent leaks o 2.2 Ensure wash runoff from vehicles stays on property o 2.3 Properly dispose of collected fluids o 2.4 Drain and properly dispose of fluids from vehicles no longer in use

Non-Production Areas 2. Maintain vehicles and their storage cont. o 2.5 Locate vehicle maintenance and storage away from surface water o 2.6 Clean maintenance and storage areas to avoid oil and grease buildup o 2.7 Clean spills immediately

Non-Production Areas 3. Locate/maintain fuel tanks o 3.1 Locate fuel tanks away from surface waters o 3.2 Check and maintain fuel tanks to prevent leaks o 3.3 Perform fueling activities carefully o 3.4 Clean spills immediately

Non-Production Areas 4. Keep nursery free of debris/trash o 4.1 Maintain property free of debris/trash o 4.2 Provide adequate number of maintained waste containers o 4.3 Keep containers in good condition and closed o 4.4 Keep waste indoors or covered outdoors

Non-Production Areas 5. Maintain restrooms o 5.1 Provide adequate restrooms and portable toilets where needed o 5.2 Ensure proper plumbing in restrooms o 5.3 Locate portable toilets away from surface water o 5.4 Regularly maintain restrooms and toilets

Non-Production Areas 6. Training o 6.1 Train personnel in waste disposal and restroom maintenance o 6.2 Train personnel in spill cleaning o 6.3 Train personnel in recycling o 6.4 Train in disposal of batteries, paint, etc o 6.5 Keep records of training