New Olericulture – Hort 320 Lesson 6, Fertility, Irrigation,...
Transcript of New Olericulture – Hort 320 Lesson 6, Fertility, Irrigation,...
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Olericulture – Hort 320 Lesson 6, Fertility, Irrigation, Pests
Jeremy S. Cowan WSU Spokane County Extension 222 N. Havana St. Spokane, WA 99202 Phone: 509-477-2145 Fax: 509-477-2087 Email: [email protected]
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Soil Composition
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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)
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Soil Management Soil Selection: Organic soils Good for production of leaf, root, and bulb crops Good for germination of fine-
seeded crops No crusting problems High fertility Slow to warm and prone to
frost damage Poor drainage
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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
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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
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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
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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
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Soil Management Soil organic matter Must be constantly renewed in mineral soils
Can have detrimental effects
High salt concentration
Layered soils
Nitrogen tie-up
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Soil Management Soil organic matter Sources:
Crop residues
Animal manures decomposed fresh
Green manures
Cover crops
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Soil Management
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Soil Management
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Soil Management Soil pH Optimum 5.0-7.0
Acid soils can be adjusted with lime
Alkaline soils are more difficult Sulfur compounds for short-term
adjustment Addition of unavailable nutrients
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Fertility - Mineral Nutrients Macronutrients: Nitrogen Calcium
Phosphorus Magnesium
(K) Potassium Sulfur
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Fertility - Mineral Nutrients Micronutrients: (Fe) Iron (Cu) Copper
(Mn) Manganese (Zn) Zinc
Boron Cobalt
(Cl) Chlorine Molybdenum
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Fertility - Mineral Nutrients Fertilizer needs dependent on: Crop
Soil type and pH
Residual nutrients
Organic matter
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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
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m2 area to be fertilized Fertility - Mineral Nutrients
kg fertilizer desired % of nutrient m2 in a hectare 43,560 ft2 = 1 acre
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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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Irrigation
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Irrigation
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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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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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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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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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Weed Control Common weeds in vegetables: Grasses foxtail, wild oats, barnyard grass
Broadleaf redroot pigweed, lambsquarter,
purslane, kochia, Canada thistle, bindweed
Sedges yellow nutsedge
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Weed Control
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Weed Control
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Weed Control
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Weed Control Methods of weed control: Cultivation
Mulching organic materials manmade materials
Herbicides
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Weed Control Potential problems with herbicide use: Limited choice of registered compounds
Lack of efficacy
Presence of resistant weed species
Crop sensitivity
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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)
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Weed Control Factors affecting rates and timing: Soil type
Environmental conditions
Stage of crop growth
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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
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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.
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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
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Disease Cycle – Pathogen Life Cycle
Stages of Disease Development overwinter
inoculation
germination
penetration
infection incubation
invasion
reproduction
dissemination
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Disease Control Disease-causing pathogens: Viruses
Fungi
Bacteria
Mycoplasmae
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Disease-Causing Pathogens Fungi > 100,000 known species, most are saprophytic
only species are known to cause disease in plants
Beneficials decay plant and animal tissues symbionts – mycorrhizae antibiotics – Penicillium, Gleocladium species
10,000
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Fungi
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Fungi
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Fungi
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Symptoms of Fungal Infection Root rots
Basal stem rot / wirestem
Damping-off
Canker
Scab
Leaf spots
Blights
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Symptoms of Fungal Infection Soft rots and dry rots
Clubroots
Galls
Witches’ broom
Warts
Leaf curl
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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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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
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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)
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Virus Diseases Given name based on host and symptoms: Tomato Ringspot Virus
Cucumber Mosaic Virus
Tobacco Mosiac Virus
Potato Leaf Roll Virus
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Virus Diseases
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Virus Diseases
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Virus Diseases
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Virus Diseases Control of virus diseases: Control insect vectors
Resistant varieties
Use virus-free material (certified seed)
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Diseases caused by bacteria
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Diseases caused by bacteria
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Control of Bacterial Disease • Mostly copper based (Bordeaux mix, Kocide, copper
sulfate) • Antibiotics – streptomycin • Resistant varieties • Insect control • Sanitation
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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
General Disease Control Strategies
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Insect Control Monitoring populations Scouting plant inspections for insects plant inspections for injury sweep nets
Trapping Baits Hormone traps
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Insect Control Action decisions: Determine injury potential (life cycle)
Determine economic threshold
Determine potential for future population shifts (sources and reproductive rate)
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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
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Insect Control Resistance management: Avoid insecticide applications when possible
Rotate insecticides with different modes of action
Maintain refuges when appropriate
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Insect Control
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