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Gleaning

Gleaning 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 Gleaning rather than just read about it. In short: Gleaning is the act of collecting leftover crops in the field after harvest. During harvest, there is food that is left or missed often because it does not meet store standards for uniformity.

Gleaning — main illustration
Gleaning — illustration

Key takeaways

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

Reference excerpt

Gleaning is the act of collecting leftover crops in the field after harvest. During harvest, there is food that is left or missed often because it does not meet store standards for uniformity. Sometimes, fields are left because they were not economically profitable to harvest. In modern times, gleaning is used to provide fresh foods to those in need. "Dumpster diving", when done for food or culinary ingredients, is seen as a similar form of food recovery. There are multiple organizations that support gleaning, including the Gleaning Network in the UK, and the National Gleaning Project in the United States. Both organizations have worked on national networks to connect modern gleaning and food recovery organizations.

History The term glean was first used in English in the 14th Century, and meant both "to gather grain or other produce left by reapers" and "to gather information or material bit by bit". It has roots in Middle English (glenen), Anglo-French (glener), and Late Latin (glen(n)ō (“make a collection). Gleaning is referred to throughout history, including biblical references in the books of Leviticus and Deuteronomy. Gleaning has long been a part of agricultural calendar and process, and was practiced widely by the rural poor during the 16th and 17th Centuries. Additionally, as much as one-eighth of labour-based households' annual earnings came from gleaning in the 18th and 19th Centuries. Technology of the mid-19th Century would heavily reduce gleaning globally.

In the Bible

According to the books of Deuteronomy and Leviticus, farmers should leave the edges of their fields unharvested (pe'ah), should not pick up that which was dropped (gleanings), and should not harvest any overlooked produce that had been forgotten when they harvested the majority of a field. On one of the two occasions that this is stated in Leviticus, it adds that in vineyards, some grapes should be left ungathered, a statement also found in Deuteronomy. These verses additionally command that olive trees should not be beaten on multiple occasions, and whatever remains from the first set of beatings should be left. According to Leviticus, these things should be left for the poor and for strangers, and Deuteronomy commands that it should be left for widows, strangers, and paternal orphans. The Book of Ruth tells of gleaning by the widow Ruth to provide for herself and her mother-in-law, Naomi, who was also a widow.

Rabbinical view In classical rabbinic literature, it was argued that the biblical regulations concerning left-overs only applied to grain fields, orchards, and vineyards. The farmer was not permitted to benefit from the gleanings, and was not permitted to discriminate among the poor, nor try to frighten them away with dogs or lions; the farmer was not even allowed to help one of the poor to gather the left-overs. However, it was also argued that the law was only applicable in Canaan, although many classical rabbinic writers, who were based in Babylon, applied the laws there too; it was also seen as only applying to Jewish paupers, but poor gentiles were allowed to benefit for the sake of civil peace.

Historic European practice

In many parts of Europe, including England and France, the Biblically derived right to glean the fields was reserved for the poor; a right, enforceable by law, that continued in parts of Europe into modern times. In 18th century England, gleaning was a legal right for "cottagers", or landless residents. In a small village the sexton would often ring a church bell at eight o'clock in the morning and again at seven in the evening to tell the gleaners when to begin and end work. This legal right effectively ended after the Steel v Houghton decision in 1788.

Modern times

In addition to supermarkets, gleaning can also occur at farms in the field. Volunteers, called gleaners, visit a farm where the farmer donates what is left in their fields to collect and donate to a food bank. In New York State in 2010, this form of gleaning alone rescued 3.6 million pounds of fruits and vegetables. In the Soviet Union, the Law of Spikelets (sometimes translated "law on gleaning") criminalised gleaning, under penalty of death, or 10 years of forced labour in exceptional circumstances. In the U.S., the Bill Emerson Good Samaritan Act of 1996 limited the liability of donors to instances of gross negligence or intentional misconduct, alleviating gleaning from much of the risk that was allegedly hampering the delivery of surplus food from restaurants and dining facilities to emergency food centers. The law preempts state Good Samaritan Acts, that provide less protection. The Shulchan Aruch argues that Jewish farmers are no longer obliged to obey the biblical rule. Nevertheless, in modern Israel, rabbis of Orthodox Judaism insist that Jews allow gleanings to be consumed by the poor and by strangers during Sabbatical years. On the island of Bali, traditional law allows fruit from a tree to be picked by the passerby from the ground—even if the tree is on privately owned land. Currently, gleaning is often practiced by humanitarian and social groups which distribute the gleaned food to the poor and hungry; in a modern context, this can include the collection of food from supermarkets at the end of the day that would otherwise be thrown away. There are a number of organizations that practice gleaning to resolve issues of societal hunger; the Society of St. Andrew and the Boston Area Gleaners, for example. In the United States there are also laws that support and sanction gleaning and the National Gleaning Project, created by the Center for Agriculture and Food Systems at Vermont Law and Graduate School connected modern gleaning and food recovery organizations across the United States while providing related policy and law resources, and examples of handbooks, waivers, and other documents organizations may utilize. These laws allow corporations to receive grants for the use of gleaning, mandates the agriculture sector to financially sustain gleaning nationally, and sanctions the distribution of the vegetables harvested from gleaning. In 2020, there were 143 gleaning organizations in the United States and Canada combined, harvesting anywhere from 163,000-5.2 million pounds of food gleaned in the year.

… excerpt ends here. Continue reading the full article.

Illustrations

Gleaning: The Gleaners by Jean-François Millet, 1857
The Gleaners by Jean-François Millet, 1857
Gleaning: Gleaning by Arthur Hughes
Gleaning by Arthur Hughes
Gleaning: Impoverished Germans gleaning in 1956
Impoverished Germans gleaning in 1956
Gleaning illustration
Gleaning illustration

Worked examples

Example 1 — a first encounter with Gleaning

Start with the simplest possible case. Write down what Gleaning 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 Gleaning 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 Gleaning 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 Gleaning

In research
Gleaning 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 Gleaning 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
Gleaning is common in secondary-school and first-year university syllabi. It links to neighbouring topics Food and drink in Christianity, Food and drink in Judaism, Food security, so understanding it makes those chapters shorter.
In everyday life
Look for Gleaning 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 Gleaning in 20 minutes

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

Frequently asked questions

What is Gleaning in simple terms?

Gleaning is the act of collecting leftover crops in the field after harvest. During harvest, there is food that is left or missed often because it does not meet store standards for uniformity.

Why does Gleaning 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 Gleaning?

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 Gleaning.

Tags

  • Food and drink in Christianity
  • Food and drink in Judaism
  • Food security
  • Foraging
  • Harvest
  • Waste collection
  • Welfare

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