In AP Environmental Science, intercropping is the practice of growing two or more different crop species in the same field at the same time, which reduces pest populations without heavy pesticide use and is listed in the CED as a core integrated pest management (IPM) method (Topic 5.14).
Intercropping means planting different crop species side by side in the same field at the same time. Think rows of corn with beans planted between them, or squash growing under taller crops. The logic is simple. Most pests specialize in one crop, so a field that's all corn is an all-you-can-eat buffet for corn pests. Mix in other species and the buffet shrinks. Pests have a harder time finding their target plant, spreading between plants, and building up huge populations.
The CED names intercropping explicitly in EK STB-1.C.1 as one of the methods inside integrated pest management (IPM), alongside biocontrol, crop rotation, and natural predators. IPM is the umbrella strategy of combining biological, physical, and limited chemical methods to control pests while minimizing environmental disruption. Intercropping is one tool in that toolbox, and it comes with bonus effects. Pairing nitrogen-fixing legumes with a heavy feeder like corn controls pests and adds usable nitrogen to the soil.
Intercropping lives in Unit 5 (Land and Water Use), Topic 5.14, and supports both learning objectives there. For 5.14.A you need to describe IPM and name its component methods, and intercropping is one of the four the CED lists by name. For 5.14.B you need to weigh benefits and drawbacks. Intercropping is a big part of the 'benefit' side of that argument, since it controls pests without the pesticide risks to wildlife, water supplies, and human health described in EK STB-1.D.1. The drawback side matters too. IPM methods like intercropping can be complex and expensive compared to just spraying a field (EK STB-1.D.2). This fits the broader APES theme of sustainable agriculture: trading short-term convenience for long-term environmental health.
Keep studying AP® Environmental Science Unit 5
Integrated Pest Management (Unit 5)
Intercropping is not a standalone topic; it's one method inside the IPM toolbox from Topic 5.14. When an FRQ asks you to describe IPM, intercropping is one of the named methods you can pull out as a concrete example.
Crop Rotation (Unit 5)
Both are IPM methods that use crop diversity against pests, but they diversify in different dimensions. Intercropping mixes crops in space (different crops in the same field at once), while crop rotation mixes crops in time (different crops in the same field across seasons or years).
Biological Control (Unit 5)
Biocontrol uses living organisms, like natural predators, to attack pests directly. Intercropping works more passively by making the habitat less friendly to pests. On the exam, both show up as the non-chemical alternatives that make IPM safer than conventional pesticide use.
Nitrogen Cycle and Soil Fertility (Units 1 and 5)
A classic intercropping setup plants nitrogen-fixing legumes between rows of corn. That's a two-for-one: fewer pests plus free nitrogen fixed into the soil, which reduces the need for synthetic fertilizer and the runoff problems that come with it.
Multiple-choice questions usually test intercropping through a farm scenario and ask you to identify which IPM method is being used. A common stem describes a farmer planting nitrogen-fixing legumes between rows of corn, and you have to recognize that as intercropping rather than crop rotation. Watch the wording carefully. If the crops are planted together at the same time, it's intercropping; if the farmer switches crops year to year, it's crop rotation. On the FRQ side, the 2021 exam (Q2) asked about the benefits and harms of pesticide use, and intercropping is exactly the kind of specific, CED-named alternative you can propose when a question asks for a way to control pests while reducing pesticide risks to wildlife, water, or human health. Naming a concrete method like intercropping scores better than vaguely saying 'use IPM.'
This is the most-tested mix-up in Topic 5.14. Intercropping is spatial diversity, meaning multiple crop species growing in the same field at the same time. Crop rotation is temporal diversity, meaning one crop per field but the species changes over seasons or years (corn for three years, then soybeans, then alfalfa). Both disrupt pests, but intercropping confuses pests right now, while rotation breaks pest life cycles over time by removing their host crop for whole growing seasons.
Intercropping means growing two or more different crop species in the same field at the same time, which makes it harder for specialized pests to find food and build large populations.
The CED names intercropping in EK STB-1.C.1 as one of the core IPM methods, along with biocontrol, crop rotation, and natural predators.
Intercropping reduces the need for pesticides, which lowers risks to wildlife, water supplies, and human health (EK STB-1.D.1).
Intercropping differs from crop rotation by location versus time: intercropping mixes crops in one field simultaneously, while crop rotation changes the crop in a field from year to year.
Planting nitrogen-fixing legumes between rows of corn is the classic exam example because it controls pests and improves soil nitrogen at the same time.
Like other IPM methods, intercropping can be more complex and expensive to manage than conventional monoculture with pesticides (EK STB-1.D.2).
Intercropping is growing multiple crop species together in the same field at the same time to reduce pest populations. It appears in Topic 5.14 as one of the named methods of integrated pest management (IPM) in EK STB-1.C.1.
Intercropping mixes different crops in the same field at the same time, while crop rotation grows one crop per field but switches species over the years (like corn, then soybeans, then alfalfa). Same goal of disrupting pests, but intercropping works through space and rotation works through time.
No. Intercropping is a non-chemical, biological/physical pest control method. That's the whole point: it lets farmers reduce pesticide use, which protects wildlife, water supplies, and human health.
Most agricultural pests specialize in one crop species, so a monoculture lets their population explode. Mixing crops breaks up that continuous food supply, making it harder for pests to find host plants and spread between them.
Planting nitrogen-fixing legumes between rows of corn. It's the example exam questions use most because it shows two benefits at once: fewer pests and more nitrogen in the soil, which cuts down on synthetic fertilizer.
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