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An advantage of using synthetic fertilizer instead of organic fertilizer is that
An advantage of using synthetic fertilizer instead of organic fertilizer is that
A vegetable farmer wishes to switch to a combination of trees and vegetables (agroforestry) on several hectares of her land to reduce erosion and to diversify what she grows. She needs to assess whether her land can produce as much income by growing two crops instead of one. The farmer estimates that the new tree crop would cover 40 percent of her fields, with the vegetable crop covering the other 60 percent. Which equation should she use to calculate how much total income she would get from using the new two-crop plan?
A vegetable farmer wishes to switch to a combination of trees and vegetables (agroforestry) on several hectares of her land to reduce erosion and to diversify what she grows. She needs to assess whether her land can produce as much income by growing two crops instead of one. The farmer estimates that the new tree crop would cover 40 percent of her fields, with the vegetable crop covering the other 60 percent. Which equation should she use to calculate how much total income she would get from using the new two-crop plan?
Country with the greatest percentage of land area affected by desertification
Country with the greatest percentage of land area affected by desertification
When a rain forest is slashed and burned, the local concentration of carbon dioxide in the atmosphere increases. This is primarily due to
When a rain forest is slashed and burned, the local concentration of carbon dioxide in the atmosphere increases. This is primarily due to
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Factors contributing to the rise in world hunger include all of the following EXCEPT
Factors contributing to the rise in world hunger include all of the following EXCEPT
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Which of the following problems is best addressed with contour plowing?
Which of the following problems is best addressed with contour plowing?
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Which of the following statements about genetic diversity is true?
Which of the following statements about genetic diversity is true?
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Which of the following methods of agricultural irrigation results in the loss of the least amount of water by evaporation?
Which of the following methods of agricultural irrigation results in the loss of the least amount of water by evaporation?
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Which of the following statements identifies a concern associated with the increased proportion of GM crops being grown?
Which of the following statements identifies a concern associated with the increased proportion of GM crops being grown?
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Glyphosates are herbicides that are often applied to genetically modified (G M) crops to kill weeds without harming the crop itself. Which of the following statements best explains the relationship shown on the graph?
Glyphosates are herbicides that are often applied to genetically modified (G M) crops to kill weeds without harming the crop itself. Which of the following statements best explains the relationship shown on the graph?
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Which of the following describes a fundamental characteristic of the green revolution in food resources?
Which of the following describes a fundamental characteristic of the green revolution in food resources?
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Which of the following is likely to minimize soil erosion?
Which of the following is likely to minimize soil erosion?
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Which of the following practices is consistent with the production of organic crops according to the United States Department of Agriculture?
Which of the following practices is consistent with the production of organic crops according to the United States Department of Agriculture?
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Long-term intensive agriculture that does not add soil amendments such as manure or fertilizer has been shown to decrease soil organic matter content. Which of the following figures best shows this relationship?
Long-term intensive agriculture that does not add soil amendments such as manure or fertilizer has been shown to decrease soil organic matter content. Which of the following figures best shows this relationship?
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Which of the following best represents the percent of water that is used for various purposes worldwide?
Which of the following best represents the percent of water that is used for various purposes worldwide?
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Q16 Read monetary return an irrigation from graph Which of the following statements best explains the graphs above?
Q16 Read monetary return an irrigation from graph Which of the following statements best explains the graphs above?
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Which of the following procedures would be best for remediating the effects of soil salinization?
Which of the following procedures would be best for remediating the effects of soil salinization?
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This type of irrigation uses a large system of sprinklers that must be manually moved from field to field and has very large evaporative losses.
This type of irrigation uses a large system of sprinklers that must be manually moved from field to field and has very large evaporative losses.
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Which of the following is true of the Ogallala Aquifer?
Which of the following is true of the Ogallala Aquifer?
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Which of the following represents a correct pairing of an agricultural practice with its environmental consequence?
Which of the following represents a correct pairing of an agricultural practice with its environmental consequence?
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Study Notes
Synthetic vs. Organic Fertilizers
- Synthetic fertilizers provide more targeted macronutrients to crops than organic fertilizers (e.g., manure).
Agroforestry Income Calculation
- To calculate agroforestry income, multiply the income per hectare from trees by the total land area and the proportion of land covered by trees (0.4). Similarly, calculate the income from vegetables by multiplying the income per hectare for vegetables by the total land area and the proportion of land covered by vegetables (0.6). Sum these two figures to determine total income.
Desertification
- Australia has the greatest percentage of land area affected by desertification.
Slash-and-Burn Rainforests & Carbon Dioxide
- Slash-and-burn deforestation increases atmospheric carbon dioxide due to oxidation of carbon compounds.
Factors Contributing to World Hunger
- Increased consumption of vegetable protein instead of meat protein is not a factor contributing to increased world hunger.
Soil Erosion Prevention
- Contour plowing helps prevent soil erosion.
Genetic Diversity in Crops
- Crossing crop plants with ancestral varieties can increase genetic resistance to pests and diseases.
Irrigation Methods & Water Loss
- Drip irrigation results in the least water loss due to evaporation.
Concerns Regarding GM Crops
- Increased use of GM seeds can lead to loss of genetic diversity in crops.
Glyphosate & Herbicide Resistance
- Glyphosate use has selected for herbicide resistance in weed populations.
Green Revolution Characteristics
- The green revolution involved the development of new, high-yield crop strains.
Soil Erosion Mitigation
- No-till agriculture helps to minimize soil erosion.
USDA Organic Crop Practices
- Using pheromones to disrupt insect mating cycles is consistent with USDA organic crop production.
Soil Organic Matter & Intensive Agriculture
- Long-term intensive agriculture without soil amendments (e.g., manure or fertilizer) decreases soil organic matter.
Global Water Usage
- Agriculture uses 70% of the world's water, while industrial/municipal use accounts for 20% and residential/commercial accounts for 10%.
Monetary Return of Irrigation
- Fruits and vegetables generally have the highest monetary return per unit of water used.
Soil Salinization Remediation
- Adding large amounts of water to leach out salts is an effective soil remediation measure for soil salinization.
Spray Irrigation
- Spray irrigation involves a system of sprinklers that move between fields. This method has significant evaporative losses.
Ogallala Aquifer
- The Ogallala Aquifer, underlying the US High Plains, is being depleted due to overuse.
Agricultural Practice & Environmental Consequence
- Paddy rice cultivation results in methane emissions.
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Description
Test your knowledge on various aspects of environmental science, including the differences between synthetic and organic fertilizers, agroforestry income calculations, and the impact of desertification. Explore the effects of slash-and-burn tactics on carbon dioxide levels and factors influencing world hunger.
