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Food, Soil, and Pest Management
Chapter 12
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Core Case Study: Grains of Hope or an Illusion?
Vitamin A deficiency in some developing countries leads to Blindness Death 1999: Porrykus and Beyer Genetically engineered rice with beta-carotene and more iron Is this the answer for malnutrition in these countries? Challenge of increased food production
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Golden Rice: Genetically Engineered Strain of Rice Containing Beta-Carotene
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12-1 What Is Food Security and Why Is It Difficult to Attain?
Concept 12-1A Many of the poor suffer health problems from chronic lack of food and poor nutrition, while many people in developed countries have health problems from eating too much food. Concept 12-1B The greatest obstacles to providing enough food for everyone are poverty, political upheaval, corruption, war, and the harmful environmental effects of food production.
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Food insecurity – Living with chronic hunger and poor nutrition.
Many of the Poor Have Health Problems Because They Do Not Get Enough to Eat Food security – Every person in a given area has daily access to enough nutritious food to have an active and healthy life. Food insecurity – Living with chronic hunger and poor nutrition. Root cause: poverty
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12.1 Many People Suffer from Chronic Hunger and Malnutrition
Due to lack of the following: Macronutrients Carbohydrates Proteins Fats Micronutrients Vitamins Minerals
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12.1 Many People Suffer from Chronic Hunger and Malnutrition
Chronic undernutrition = hunger Chronic malnutrition – deficiencies of protein and other key nutrients What progress is being made?
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12.1 Key Nutrients for a Healthy Human Life
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12.1 Many People Do No Get Enough Vitamins and Minerals
One of every three people suffers from a deficiency of one or more vitamins and minerals, most often in developing countries. Iron – little or no iron can cause anemia, can increase a woman’s chances of dying from hemorrhage in childbirth. Vitamin A – More susceptible to common childhood infectious diseases. Children younger 6 go blind. More than half of all children die due to lack of vitamin A. Iodine – Essential for proper functioning of the thyroid gland, which produces hormones that control the body’s rate of metabolism. Chronic lack of iodine can cause stunted growth, mental retardation a goiter (a swollen thyroid gland that can lead to deafness). Golden rice ?
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12.1 Woman with Goiter in Bangladesh
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12.1 Acute Food Shortages Can Lead to Famines
Occurs when – There is a severe shortage of food accompanied by mass starvation, many deaths, economic chaos, and social disruption. Often results in - mass migrations of starving people to other areas or refugee camps in a search for food, water, and medicine help. Usually caused by - crop failures, drought, flooding, war, and other catastrophic events.
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12.1 War and the Environment: Starving Children in Famine-Stricken Sudan, Africa
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12.1 Many People Have Health Problems from Eating Too Much
Overnutrition – occurs when food energy intake exceeds energy use and causes excess fat. Too many calories, too little exercise, or both can cause overnutrition. Similar health problems to those who are underfed Lower life expectancy Greater susceptibility to disease and illness Lower productivity and life quality
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12-2 How Is Food Produced? Concept 12-2A We have sharply increased crop production using a mix of industrialized and traditional agriculture. Concept 12-2B We have used industrialized and traditional methods to greatly increase supplies of meat, fish, and shellfish.
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12.2 Food Production Has Increased Dramatically
Three systems produce most of our food Croplands: 77% Rangelands, pastures, and feedlots: 16% Aquaculture: 7% Importance of wheat, rice, and corn Tremendous increase in global food production
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12.2 Food Production Has Increased Dramatically
This occurred because of the following technological advances: Increased use of tractors, farm machinery, and high-tech fishing equipment. Inorganic chemical fertilizers Irrigation Pesticides High-yield grain varieties Raising large numbers of livestock poultry and fish in factory-like conditions. These developments have led to increasing reliance on industrialized production of a fairly small number of crops.
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12.2 Industrialized Crop Production Relies on High-Input Monocultures
Industrialized agriculture, high-input agriculture Goal is to steadily increase crop yield Plantation agriculture: cash crops Increased use of greenhouses to raise crops
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12.2 Satellite Images of Greenhouse Land Used in the Production of Food Crops
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12.2 Traditional Agriculture Often Relies on Low-Input Polycultures
Traditional subsistence agriculture Traditional intensive agriculture Polyculture Benefits over monoculture Slash-and-burn agriculture
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Science Focus: Soil Is the Base of Life on Land
Soil composition Soil formation - weathering Layers (horizons) of mature soils O horizon: leaf litter A horizon: topsoil B horizon: subsoil C horizon: parent material, often bedrock Soil erosion - The wearing away of a field's topsoil by the natural physical forces of water and wind or through forces associated with farming activities such as tillage.
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Soil Formation and Generalized Soil Profile
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12.2 A Closer Look at Industrialized Crop Production
Green Revolution: increase crop yields Monocultures of high-yield key crops E.g., rice, wheat, and corn Use large amounts of fertilizers, pesticides, and water Multiple cropping Second Green Revolution: use of dwarf varieties of rice and wheat. Introduced in India and China. World grain has tripled in production
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12.2 Case Study: Industrialized Food Production in the United States
Agribusiness Annual sales Food production: very efficient Percent of income spent on food
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12.2 Crossbreeding and Genetic Engineering Can Produce New Crop Varieties (1)
Gene Revolution Cross-breeding through artificial selection Slow process (15 yrs or more) Genetic engineering Genetic modified organisms (GMOs): transgenic organisms
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Age of Genetic Engineering: developing crops that are resistant to:
12.2 Crossbreeding and Genetic Engineering Can Produce New Crop Varieties (2) Age of Genetic Engineering: developing crops that are resistant to: Heat and cold Herbicides Insect pests Parasites Viral diseases Drought Salty or acidic soil Advanced tissue culture techniques
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12.2 Genetic Engineering: Steps in Genetically Modifying a Plant
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12.2 Meat Production and Consumption Have Grown Steadily
Animals for meat raised in Pastures Feedlots Meat production increased fourfold between 1961 and 2007 Demand is expected to go higher
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12.2 Industrialized Meat Production
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12.2 Fish and Shellfish Production Have Increased Dramatically
Aquaculture, blue revolution World’s fastest-growing type of food production Dominated by operations that raise herbivorous species Polyaquaculture
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12-3 What Environmental Problems Arise from Food Production?
Concept Food production in the future may be limited by its serious environmental impacts, including soil erosion and degradation, desertification, water and air pollution, greenhouse gas emissions, and degradation and destruction of biodiversity.
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12.3 Producing Food Has Major Environmental Impacts
Harmful effects of agriculture on Biodiversity Soil Water Air Human health
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NATURAL CAPITAL DEGRADATION
Food Production Biodiversity Loss Soil Water Air Pollution Human Health Loss and degradation of grasslands, forests, and wetlands Erosion Water waste Greenhouse gas emissions (CO2) from fossil fuel use Nitrates in drinking water (blue baby) Aquifer depletion Loss of fertility Increased runoff, sediment pollution, and flooding from cleared land Greenhouse gas emissions (N2O) from use of inorganic fertilizers Pesticide residues in drinking water, food, and air Salinization Fish kills from pesticide runoff Figure 12.9 Major harmful environmental effects of food production (Concept 12-3). According to a 2002 study by the United Nations, nearly 30% of the world’s cropland has been degraded to some degree by soil erosion, salt buildup, and chemical pollution, and 17% has been seriously degraded. Question: Which item in each of these categories do you believe is the most harmful? Waterlogging Killing wild predators to protect livestock Desertification Pollution from pesticides and fertilizers Greenhouse gas emissions of methane (CH4) by cattle (mostly belching) Contamination of drinking and swimming water from livestock wastes Loss of genetic diversity of wild crop strains replaced by monoculture strains Algal blooms and fish kills in lakes and rivers caused by runoff of fertilizers and agricultural wastes Other air pollutants from fossil fuel use and pesticide sprays Bacterial contamination of meat Fig. 12-9, p. 286
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12.3 Topsoil Erosion Is a Serious Problem in Parts of the World
Natural causes Human causes Two major harmful effects of soil erosion Loss of soil fertility Water pollution
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12.3 Natural Capital Degradation: Severe Gully Erosion on Cropland in Bolivia
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12.3 Natural Capital Degradation: Global Soil Erosion
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12.3 Drought and Human Activities Are Degrading Drylands
Desertification – occurs when the productive potential of soil, especially on arid or semiarid land, falls by 10% or more because of a combination of prolonged drought and human activities that reduce or degrade topsoil. Moderate – a 10-25% drop in productivity. Severe – a 25-50% drop in productivity Very severe – more than 50% causing huge gullies and sand dunes. Effect of global warming on desertification
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12.3 Severe Desertification
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12.3 Natural Capital Degradation: Desertification of Arid and Semiarid Lands
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12.3 Excessive Irrigation Has Serious Consequences
Irrigation problems Salinization Waterlogging
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12.3 Natural Capital Degradation: Severe Salinization on Heavily Irrigated Land
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12.3 There May Be Limits to Expanding the Green Revolutions
Can we expand the green revolution by Irrigating more cropland? Improving the efficiency of irrigation? Cultivating more land? Marginal land? Using GMOs? Multicropping?
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12.3 Industrialized Food Production Requires Huge Inputs of Energy
Industrialized food production and consumption have a large net energy loss Consider the energy used to grow, store, process, package, transport, refrigerate, and cook all land and animal food, about 10 units of nonrenewable fossil fuel energy are needed to put 1 unit of food energy on the table.
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12.3 Industrialized Agriculture uses ~17% of All Commercial Energy Used in the U.S.
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12.3 There Is Controversy over Genetically Engineered Foods
Pros Cons What about chimeraplasty?
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12.3 Trade-Offs: Genetically Modified Crops and Foods
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Biodiversity threatened when
12.3 Food and Biofuel Production Systems Have Caused Major Biodiversity Losses Biodiversity threatened when Forest and grasslands are replaced with croplands Agrobiodiversity threatened when Human-engineered monocultures are used Importance of seed banks Newest: underground vault in the Norwegian Arctic
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12.3 Industrialized Meat Production Has Harmful Environmental Consequences
Advantages Disadvantages
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12.3 Trade-Offs: Animal Feedlots
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12.3 Producing Fish through Aquaculture Can Harm Aquatic Ecosystems
Advantages Disadvantages
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12.3 Trade-Offs: Aquaculture
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12-4 How Can We Protect Crops from Pests More Sustainably?
Concept We can sharply cut pesticide use without decreasing crop yields by using a mix of cultivation techniques, biological pest controls, and small amounts of selected chemical pesticides as a last resort (integrated pest management).
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12.4 Nature Controls the Populations of Most Pests
What is a pest? Natural enemies—predators, parasites, disease organisms—control pests In natural ecosystems In many polyculture agroecosystems What will happen if we kill the pests?
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12.4 Natural Capital: Spiders are Important Insect Predators
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12.4 We Use Pesticides to Try to Control Pest Populations (1)
Insecticides Herbicides Fungicides Rodenticides Herbivores overcome plant defenses through natural selection: coevolution
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12.4 We Use Pesticides to Try to Control Pest Populations (2)
First-generation pesticides Second-generation pesticides Paul Muller: DDT Benefits versus harm Broad-spectrum agents Persistence
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12.4 Individuals Matter: Rachel Carson
Biologist Silent Spring Potential threats of uncontrolled use of pesticides
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12.4 Modern Synthetic Pesticides Have Several Advantages
Save human lives Increases food supplies and profits for farmers Work quickly Health risks are very low relative to their benefits New pest control methods: safer and more effective
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12.4 Modern Synthetic Pesticides Have Several Disadvantages (1)
Accelerate the development of genetic resistance to pesticides by pest organisms Expensive for farmers Some insecticides kill natural predators and parasites that help control the pest population Pollution in the environment Some harm wildlife Some are human health hazards
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12.4 Modern Synthetic Pesticides Have Several Disadvantages (2)
David Pimentel: Pesticide use has not reduced U.S. crop loss to pests Loss of crops is about 31%, even with 33-fold increase in pesticide use High environmental, health, and social costs with use Use alternative pest management practices Pesticide industry refutes these findings
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12.4 Trade-Offs: Conventional Chemical Pesticides
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Science Focus: Glyphosate-Resistant Crop Weed Management System: A Dilemma
Best-selling herbicide (Roundup) Advantages Disadvantages
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12.4 What Can You Do? Reducing Exposure to Pesticides
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12.4 Case Study: Ecological Surprises
1955: Dieldrin sprayed to control mosquitoes Malaria was controlled Dieldrin didn’t leave the food chain Domino effect of the spraying Happy ending
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12.4 Laws and Treaties Can Help to Protect Us from the Harmful Effects of Pesticides
U.S. federal agencies EPA USDA FDA Effects of active and inactive pesticide ingredients are poorly documented Circle of poison, boomerang effect
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12.4 There Are Alternatives to Using Pesticides (1)
Fool the pest Provide homes for pest enemies Implant genetic resistance Bring in natural enemies
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12.4 There Are Alternatives to Using Pesticides (2)
Use insect perfumes E.g., pheromones Bring in hormones Scald them with hot water
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12.4 Solutions: An Example of Genetic Engineering to Reduce Pest Damage
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12.4 Natural Capital: Biological Pest Control
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12.4 Integrated Pest Management Is a Component of Sustainable Agriculture
Integrated pest management (IPM) Coordinate: cultivation, biological controls, and chemical tools to reduce crop damage to an economically tolerable level Disadvantages
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12-5 How Can We Improve Food Security?
Concept We can improve food security by creating programs to reduce poverty and chronic malnutrition, relying more on locally grown food, and cutting food waste.
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12.5 Use Government Policies to Improve Food Production and Security (1)
Control prices Provide subsidies Let the marketplace decide (no government involvement).
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12.5 Use Government Policies to Improve Food Production and Security (2)
United Nations Children’s Fund (UNICEF) suggests these measures Immunizing children against childhood diseases Encourage breast-feeding Prevent dehydration in infants and children Provide family planning services Increase education for women Preventing health problems in children is an important step toward global food security.
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12-6 How Can We Produce Food More Sustainably? (1)
Concept 12-6A Sustainable food production will require reducing topsoil erosion, eliminating overgrazing and overfishing, irrigating more efficiently, using integrated pest management, promoting agrobiodiversity, and providing government subsidies for more sustainable farming, fishing, and aquaculture.
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12-6 How Can We Produce Food More Sustainably? (2)
Concept 12-6B Producing enough food to feed the rapidly growing human population will require growing crops in a mix of monocultures and polycultures and decreasing the enormous environmental impacts of industrialized food production.
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12.6 Reduce Soil Erosion Soil conservation, some methods
Terracing Contour planting Strip cropping with cover crop Alley cropping, agroforestry Windbreaks or shelterbeds Conservation-tillage farming No-till Minimum tillage Identify erosion hotspots
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12.6 Soil Conservation Methods
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Figure 12.24 Soil conservation methods include (a) terracing, (b) contour planting and strip cropping, (c) alley cropping, and (d) windbreaks (Concept 12-6A). Fig a, p. 302
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(b) Contour planting and strip cropping
Figure 12.24 Soil conservation methods include (a) terracing, (b) contour planting and strip cropping, (c) alley cropping, and (d) windbreaks (Concept 12-6A). (b) Contour planting and strip cropping Fig b, p. 302
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(c) Alley cropping Figure 12.24
Soil conservation methods include (a) terracing, (b) contour planting and strip cropping, (c) alley cropping, and (d) windbreaks (Concept 12-6A). (c) Alley cropping Fig c, p. 302
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Figure 12.24 Soil conservation methods include (a) terracing, (b) contour planting and strip cropping, (c) alley cropping, and (d) windbreaks (Concept 12-6A). (d) Windbreaks Fig d, p. 302
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12.6 Solutions: Mixture of Monoculture Crops Planted in Strips on a Farm
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12.6 Case Study: Soil Erosion in the United States—Learning from the Past
What happened in the Dust Bowl in the 1930s? Migrations to the East, West, and Midwest 1935: Soil Erosion Act More soil conservation needed
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12.6 Natural Capital Degradation: Dust Storm, Driven by Wind Blowing across Eroded Soil
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12.6 Natural Capital Degradation: The Dust Bowl of the Great Plains, U.S.
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12.6 Restore Soil Fertility
Organic fertilizer Animal manure Green manure Compost Commercial inorganic fertilizer active ingredients Nitrogen Phosphorous Potassium
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12.6Reduce Soil Salinization and Desertification
Prevention Clean-up Desertification, reduce Population growth Overgrazing Deforestation Destructive forms of planting, irrigation, and mining
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Solutions: Soil Salinization
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12.6 Solutions: Practice More Sustainable Aquaculture
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12.6 Produce Meat More Efficiently and Humanely
Shift to more grain-efficient forms of protein Shift to farmed herbivorous fish Develop meat substitutes; eat less meat Whole Food Markets: more humane treatment of animals
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12.6 Shift to More Sustainable Agriculture (1)
Paul Mader and David Dubois 22-year study Compared organic and conventional farming Benefits of organic farming
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12.6 Solutions: Organic Farming
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12.6 Shift to More Sustainable Agriculture (2)
Strategies for more sustainable agriculture Research on organic agriculture with human nutrition in mind Show farmers how organic agricultural systems work Subsidies and foreign aid Training programs; college curricula
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12.6 Solutions: Sustainable Organic Agriculture
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Science Focus: Scientists Are Studying Benefits and Costs of Organic Farming
Effect of different fertilizers on nitrate leaching in apple trees Less nitrate leached into the soil after organic fertilizers were used Significance?
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Science Focus: Sustainable Polycultures of Perennial Crops
Wes Jackson: natural systems agriculture benefits No need to plow soil and replant each year Reduces soil erosion and water pollution Deeper roots – less irrigation needed Less fertilizer and pesticides needed
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12.6 Comparison of the Roots between an Annual Plant and a Perennial Plant
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12.6 Buy Locally Grown Food Supports local economies
Reduces environmental impact on food production Community-supported agriculture
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12.6 What Can You Do? Sustainable Organic Agriculture
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