Olericulture Hort 320 Lesson 6, Fertility, Irrigation, Pests
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1 Olericulture Hort 320 Lesson 6, Fertility, Irrigation, Pests Jeremy S. Cowan WSU Spokane County Extension 222 N. Havana St. Spokane, WA Phone: Fax:
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4 Soil Composition
5 Soil Management Soil Types: Organic Peat soils (>50% OM, partly decomposed) Muck soils (<50% OM, mostly decomposed) Mineral Sand (large particles, low WHC, low nutrients) Silt (medium particles, high WHC, med nutrients) Clay (small particles, med WHC, high nutrients)
6 Soil Management Soil Selection: Organic soils Good for production of leaf, root, and bulb crops Good for germination of fineseeded crops No crusting problems High fertility Slow to warm and prone to frost damage Poor drainage
7 Soil Management Soil Selection: Sands and Loamy Sands Preferred for early production Good for root and tuber crops Well drained and aerated Low nutrient content Very low WHC
8 Soil Management Soil Selection: Sandy Loams, Silt Loams, and Loams Preferred for most vegetable production Easy to work and give high yields Good WHC Moderate levels of natural nutrition Easy soils to maintain
9 Soil Management Soil Selection: Loamy Clays and Clays Suitable for late planted crops Productive in dryland production Good water retention during extended dry periods Poor aeration Can develop compaction or texture problems
10 Soil Management Soil organic matter Source of nitrogen, phosphorus, and sulfur Increases cation exchange Improves soil structure Improves porosity of heavy soils Improves heat absorption
11 Soil Management Soil organic matter Must be constantly renewed in mineral soils Can have detrimental effects High salt concentration Layered soils Nitrogen tie-up
12 Soil Management Soil organic matter Sources: Crop residues Animal manures decomposed fresh Green manures Cover crops
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14 Soil Management
15 Soil Management
16 Soil Management Soil ph Optimum Acid soils can be adjusted with lime Alkaline soils are more difficult Sulfur compounds for short-term adjustment Addition of unavailable nutrients
17 Fertility - Mineral Nutrients Macronutrients: Nitrogen Phosphorus (K) Potassium Calcium Magnesium Sulfur
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20 Fertility - Mineral Nutrients Micronutrients: (Fe) Iron (Mn) Manganese Boron (Cl) Chlorine (Cu) Copper (Zn) Zinc Cobalt Molybdenum
21 Fertility - Mineral Nutrients Fertilizer needs dependent on: Crop Soil type and ph Residual nutrients Organic matter
22 Fertility - Mineral Nutrients Determination of fertilizer rates: Determine intended crop Collect soil samples Follow published recommendations for soil type and location Use tissue sampling and seasonal applications if appropriate
23 Fertility - Mineral Nutrients kg % m 2 of fertilizer area in nutrient a hectare to be desired fertilized 43,560 ft 2 = 1 acre
24 Irrigation Amount and frequency dependent on: Crop requirement Environmental conditions Soil type Irrigation equipment type dependent on: Intended crop use and crop response Water availability and price Soil characteristics
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26 Irrigation
27 Irrigation
28 Irrigation Types of irrigation equipment: Surface or flood Sprinkler hand move side roll big gun center pivot Trickle or drip systems Sub-irrigation
29 Irrigation Types of irrigation equipment: Surface or flood Sprinkler hand move side roll big gun center pivot Trickle or drip systems Sub-irrigation
30 Irrigation Types of irrigation equipment: Surface or flood Sprinkler hand move side roll big gun center pivot Trickle or drip systems Sub-irrigation
31 Irrigation Types of irrigation equipment: Surface or flood Sprinkler hand move side roll big gun center pivot Trickle or drip systems Sub-irrigation
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33 Weed Control Common weeds in vegetables: Grasses foxtail, wild oats, barnyard grass Broadleaf redroot pigweed, lambsquarter, purslane, kochia, Canada thistle, bindweed Sedges yellow nutsedge
34 Weed Control
35 Weed Control
36 Weed Control
37 Weed Control Methods of weed control: Cultivation Mulching organic materials manmade materials Herbicides
38 Weed Control Potential problems with herbicide use: Limited choice of registered compounds Lack of efficacy Presence of resistant weed species Crop sensitivity
39 Weed Control Reasons for herbicide effectiveness: Crop morphology (i.e. waxy leaves) Application timing (i.e. root inhibitors) Spray placement (i.e. spray shields) Biochemical crop tolerance (selectivity)
40 Weed Control Factors affecting rates and timing: Soil type Environmental conditions Stage of crop growth
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42 Disease Control What is Plant Disease? ANY malfunctioning of host cells and tissues that results from continuous irritation by a pathogenic agent or environmental factor and leads to the development of symptoms
43 Disease Control Agents of Plant Disease: Nonparasitic noninfectious, abiotic Parasitic Infectious, biotic An organism living on or in another living organism (host) and obtaining its food from the latter.
44 Disease Control Plant Pathogens: Compete with crop plants by using metabolites, carbohydrates and other nutrients produced by the host Reduce photosynthetic efficiency Reduce water and nutrient uptake Disrupt normal growth and metabolites at the cellular level
45 Disease Cycle Pathogen Life Cycle Stages of Disease Development dissemination overwinter inoculation reproduction germination invasion penetration incubation infection
46 Disease Control Disease-causing pathogens: Viruses Fungi Bacteria Mycoplasmae
47 Disease-Causing Pathogens Fungi > 100,000 known species, most are saprophytic only plants 10,000 species are known to cause disease in Beneficials decay plant and animal tissues symbionts mycorrhizae antibiotics Penicillium, Gleocladium species
48 Fungi
49 Fungi
50 Fungi
51 Symptoms of Fungal Infection Root rots Basal stem rot / wirestem Damping-off Canker Scab Leaf spots Blights
52 Symptoms of Fungal Infection Soft rots and dry rots Clubroots Galls Witches broom Warts Leaf curl
53 Control of Fungal Diseases Soil fumigation methyl bromide, vapam Use disease free propagules Resistant varieties Fungicides Crop rotation Cultural practices sanitation / no wounds Biocontrol agents / antagonists
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55 Virus Diseases Virus particles A = flexous threadlike virus B = rigid rod-shaped virus C = short, bacillus like-virus D = polyhedral virus D1 = icosahedron E = geminivirus
56 Virus Diseases Obligate parasites To cause disease, they must have a vector: Insects (aphids, leafhoppers, thrips) Soil-borne fungi Nematodes Infected seed Mechanical transmission (humans)
57 Virus Diseases Given name based on host and symptoms: Tomato Ringspot Virus Cucumber Mosaic Virus Tobacco Mosiac Virus Potato Leaf Roll Virus
58 Virus Diseases
59 Virus Diseases
60 Virus Diseases
61 Virus Diseases Control of virus diseases: Control insect vectors Resistant varieties Use virus-free material (certified seed)
62 Diseases caused by bacteria
63 Diseases caused by bacteria
64 Control of Bacterial Disease Mostly copper based (Bordeaux mix, Kocide, copper sulfate) Antibiotics streptomycin Resistant varieties Insect control Sanitation
65 General Disease Control Strategies Disease control strategies: Utilize certified seed Control refuge species Select disease-free production sites Use disease resistant cultivars Utilize crop rotation Optimize planting date for avoidance Apply appropriate pesticides when necessary Control vectors
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67 Insect Control Monitoring populations Scouting plant inspections for insects plant inspections for injury sweep nets Trapping Baits Hormone traps
68 Insect Control Action decisions: Determine injury potential (life cycle) Determine economic threshold Determine potential for future population shifts (sources and reproductive rate)
69 Insect Control Insect control strategies: Eliminate refuges Protect beneficial insects Understand the life cycle of important pests Design an effective scouting program Timely insecticide applications
70 Insect Control Resistance management: Avoid insecticide applications when possible Rotate insecticides with different modes of action Maintain refuges when appropriate
71 Insect Control
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