science

Row cover

Row cover is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Row cover rather than just read about it. In short: In agriculture and gardening, row cover is any transparent or semi-transparent flexible material, like fabric or plastic sheeting, used as a protective covering for plants, usually vegetables. Covers are used to extend growing seasons, and reduce undesirable effects of cold, wind and insects.

Key takeaways

Row cover belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Row cover to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Row cover from memory before moving on to harder problems.

Reference excerpt

In agriculture and gardening, row cover is any transparent or semi-transparent flexible material, like fabric or plastic sheeting, used as a protective covering for plants, usually vegetables. Covers are used to extend growing seasons, and reduce undesirable effects of cold, wind and insects. Row covers can reduce the drying effect of wind, and can provide a small amount of warming in a similar way to unheated cold frames, greenhouses and polytunnels, creating a microclimate for the plants. The first commercial-scale use of polyethylene row covers in the US was in the 1950s, and by the 1980s their use was widespread. Row cover is a lightweight synthetic, such as clear plastic (polyethylene) or spunbonded polyester called horticultural fleece. Plastic covers are elevated above plants on a supporting framework such as wire hoops to form a low tunnel. (Plastic placed directly on the ground is mulch.) Fleece covers can be placed directly on plants or on supporting frames. Floating row cover is the term used when there are no (or minimal) supports under the fleece and the plants themselves hold up the fleece, though the edges may be anchored to the ground against wind by metal staples or soil piled up over the edges. All row cover materials reduce the amount of light reaching the plants by a small amount (for example, 10%–20%), but such materials do not reduce sunlight in the way shade cloth does (50%–95% shading). Commercial products are marketed describing the percentage of light reduction. In hot weather, plastic covers need to be vented to prevent heat-buildup or too much moisture under the cover, and may have built in vent holes. Fleece material is self-venting and will allow water and rain to penetrate the cover. Row covers provide better frost protection in the fall than spring because the heat built up in the soil over summer will help to raise the temperature a few degrees under a cover. Fleece covers can protect against certain destructive insects but must be removed when the crop is flowering if insect pollination is required.

See also Horticultural fleece Plastic mulch Cloche (agriculture) Technical textile

References

Illustrations

Worked examples

Example 1 — a first encounter with Row cover

Start with the simplest possible case. Write down what Row cover claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Row cover before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Row cover ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Row cover

In research: Row cover appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Row cover in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Row cover is common in secondary-school and first-year university syllabi. It links to neighbouring topics Farming tools, Gardening aids, so understanding it makes those chapters shorter.
In everyday life: Look for Row cover outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Row cover in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Row cover means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Row cover out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Row cover in simple terms?

Why does Row cover matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Row cover?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Row cover.