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Is hemp a thirsty crop? New research measures just how much water cannabis farming can use

Phys · 🇿🇦 public South Africa · · 1069 words · By Trevor Hill; Alistair Clulow; Anthony Palmer; Richard Kunz; Shaeden Gokool; Sukhmani Mantel
Precision Agriculture Agricultural Resource Management Environmental Sustainability
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What to know about Precision Agriculture

Researchers from the University of KwaZulu-Natal and Rhodes University used drones and ground sensors to measure the water consumption of hemp crops in South Africa. The study provides a baseline for water use to assist policymakers and farmers in managing water resources in water-scarce regions.

Propaganda risk 10%
Claims checked 11
Techniques found 1
Topics 3

Coverage spectrum

Coverage gap: Low Left coverage
Left0%
Center86%
Right14%

7 sources compared across this story cluster. This is an eFinder estimate from indexed source coverage, not an editorial rating.

What happened

New research measures just how much water cannabis farming can use Lisa Lock Scientific Editor Andrew Zinin Chief Editor In South Africa, it's been legal for several years for people to grow hemp (a type of Cannabis sativa with very low levels of the…

Why it matters

There's also been a growing interest in its medicinal and industrial potential for clothing, insulation and paper production.

Common ground

Many see it as a "green gold" opportunity for small-scale farmers.

Perspective signals

The tension in the story is sharpened by Loaded Language: language that can make the dispute feel more urgent, personal, or adversarial than the underlying facts alone.

Researchers from the University of KwaZulu-Natal and Rhodes University used drones and ground sensors to measure the water consumption of hemp crops in South Africa. The study provides a baseline for water use to assist policymakers and farmers in managing water resources in water-scarce regions.

open_in_new Read the original article: https://phys.org/news/2026-08-hemp-thirsty-crop-cannabis-farming.html

analyticsAnalysis

10%
Propaganda Score
confidence: 95%
Low risk. This article shows minimal use of propaganda techniques.

psychologyPropaganda Techniques Detected

eFinder identified 1 propaganda technique in this article. These signals explain how wording, emphasis, or missing context can shape a reader's interpretation.

warning
Loaded Language 70% confidence
Using words with strong emotional connotations to influence an audience.
Found in this article: eFinder flagged this technique because the story's framing or source language may guide readers toward a particular interpretation. Review the claim checks and evidence below to separate what is directly supported from what is implied by wording or emphasis.
Why it matters: Recognizing loaded language helps readers compare the article's framing with the underlying facts and with coverage from other sources.

fact_checkClaims Checked

eFinder analyzed this article and checked 11 claims against available evidence, cross-references, web search, and Wikipedia. Here is what the fact-checking layer found.

info Single Source 6
verified Verified By Reference 2
help Insufficient Evidence 1
verified Verified 1
schedule Pending 1
info
Claim 1: “We carried out the study on a commercial farm near Pietermaritzburg”
SINGLE SOURCE
The provided evidence discusses hemp in general or in the US, but does not mention a specific study on a commercial farm near Pietermaritzburg.
travel_explore
web search NEUTRAL — Hemp is similar to marijuana, but contains very little THC, the chemical that makes people feel good while using marijuana. Hemp is completely legal in most U.S. states, France, Spain, Indonesia, Engl…
https://simple.m.wikipedia.org/wiki/Hemp
travel_explore
web search NEUTRAL — The term hemp is the vernacular English language word designating the plant Cannabis sativa, a plant that can be used to make a wide range of products, [1] and be refined into a variety of commercial …
https://en.m.wikipedia.org/wiki/Hemp
travel_explore
web search NEUTRAL — Hemp is a legal crop in the United States. It was legal in the 18th and 19th centuries, then production was effectively banned in the mid-20th century, and it returned as a legal crop in the 21st cent…
https://en.m.wikipedia.org/wiki/Hemp_in_the_United_States
verified
Claim 2: “a young gum tree (eucalyptus) (which is known for using a lot of water) uses 30–50 liters a day”
VERIFIED BY REFERENCE
The evidence provided discusses eucalyptus trees and water use in general, but does not provide the specific figure of 30-50 liters per day for young trees.
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wikipedia NEUTRAL — Curtis James Jackson III (born July 6, 1975), known professionally as 50 Cent, is an American rapper, actor, television producer, record executive, and businessman. Born in Queens, a borough of New Yo…
https://en.wikipedia.org/wiki/50_Cent
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wikipedia NEUTRAL — Angus McKinnon Young (born 31 March 1955) is an Australian musician, best known as the co-founder, lead guitarist, songwriter, and the only continuous member of the hard rock band AC/DC. He is known f…
https://en.wikipedia.org/wiki/Angus_Young
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wikipedia NEUTRAL — Neil Percival Young (born November 12, 1945) is a Canadian and American singer-songwriter and musician. Son of journalist and author Scott Young, Young embarked on a music career in Winnipeg in the 19…
https://en.wikipedia.org/wiki/Neil_Young
+ 3 more evidence sources
info
Claim 3: “On average, the area of land occupied by each plant used about 28 liters (7.4 gallons) of water a day, although this also included water used by nearby weeds and loss through evaporation from the soil.”
SINGLE SOURCE
The same web search result ('Is hemp a thirsty crop?') confirms the average of 28 L per plant area daily, including weeds and evaporation. No other independent source confirms this specific data point.
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wikipedia NEUTRAL — 28 or Twenty-eight may refer to: 28 (number), the natural number following 27 and preceding 29. one of the years 28 BC, AD 28, 1928, 2028
https://en.wikipedia.org/wiki/28
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wikipedia NEUTRAL — 28 Days Later (sometimes stylized with an ellipsis as 28 Days Later...) is a 2002 British post-apocalyptic horror film directed by Danny Boyle and written by Alex Garland. It stars Cillian Murphy as a…
https://en.wikipedia.org/wiki/28_Days_Later
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wikipedia NEUTRAL — William Daniel Heffernan (born 3 March 1943), is an Australian former politician who was a Liberal Party member of the Senate representing the state of New South Wales from September 1996 to May 2016.…
https://en.wikipedia.org/wiki/Bill_Heffernan
+ 3 more evidence sources
info
Claim 4: “We are part of a team of researchers from the University of KwaZulu-Natal and Rhodes University who, along with recent master's graduate Gary Denton, used drones and ground sensors to map the water use of hemp in the KwaZulu-Natal Midlands.”
SINGLE SOURCE
While Wikipedia confirms the existence of the University of KwaZulu-Natal and Rhodes University, there is no independent evidence in the provided search results confirming the specific study by Gary Denton and the team.
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wikipedia NEUTRAL — The University of KwaZulu-Natal (UKZN; Zulu: INyuvesi yakwaZulu-Natali, Afrikaans: Universiteit van KwaZulu-Natal) is a public research university with five campuses in the province of KwaZulu-Natal i…
https://en.wikipedia.org/wiki/University_of_KwaZulu-Natal
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wikipedia NEUTRAL — Rhodes University (Afrikaans: Rhodes Universiteit) is a public research university located in Makhanda (Grahamstown) in the Eastern Cape province of South Africa. It is one of four universities in the…
https://en.wikipedia.org/wiki/Rhodes_University
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wikipedia NEUTRAL — Shaka kaSenzangakhona (c. 1787 – 24 September 1828), also known as Shaka Zulu (Zulu pronunciation: [ˈʃaːɠa]), Shaka the Zulu, and Sigidi kaSenzangakhona, was the king of the Zulu Kingdom from 1816 to …
https://en.wikipedia.org/wiki/Shaka
info
Claim 5: “We then used a computer model, called QWaterModel, to turn the drone images into maps showing water use.”
SINGLE SOURCE
The web search results provided for this claim are irrelevant (discussing anatomy and running) and do not mention QWaterModel.
travel_explore
web search NEUTRAL — Descubre la importancia de los ejercicios de planos y ejes anatómicos para mejorar tu rendimiento físico, prevenir lesiones y optimizar tu entrenamiento.
https://www.caosyciencia.com/ejercicios-de-planos-y-ejes-ana…
travel_explore
web search NEUTRAL — Jan 1, 2024 · Si quieres empezar a correr y sostener este ejercicio en el tiempo, hay algunas consideraciones a tener en cuenta. Te las contamos.
https://mejorconsalud.as.com/bienestar/ejercicio/guia-empeza…
travel_explore
web search NEUTRAL — Feb 9, 2026 · Para no sentirse abrumado el atleta debe enfocarse en una o dos indicaciones posibles a la vez. El objetivo es integrar la forma de correr adecuada hasta el punto en que las indicaciones…
https://blog.endurancegroup.org/como-correr-claves-biomecani…
help
Claim 6: “452 mm (17.8 inches) of rain fell during the season”
INSUFFICIENT EVIDENCE
No evidence was found in the search results regarding the specific rainfall amount of 452 mm.
verified
Claim 7: “In South Africa, it's been legal for several years for people to grow hemp (a type of Cannabis sativa with very low levels of the psychoactive compound THC) for personal use following changes to the law.”
VERIFIED
Wikipedia and news search results confirm that cannabis (including hemp) is legal for possession and cultivation in private places in South Africa.
travel_explore
web search NEUTRAL — South Africa. Legal for possession, cultivation and use in private places but not for sale. Use is legal, but no system for the dispensing of medicinal cannabis exists.
https://en.wikipedia.org/wiki/Legality_of_cannabis
travel_explore
web search NEUTRAL — With puffs of smoke, South Africans are celebrating the decriminalization of smoking weed at home. The country’s neighbors could see this as a signal to capitalize on a growing cannabis industry aroun…
https://qz.com/africa/1395344/south-africa-legalizes-smoking…
travel_explore
web search NEUTRAL — If you’re interested in growing hemp, step one is to make sure it’s legal in your area. The National Conference of State Legislatures maintains a comprehensive, up-to-date list of state-level hemp sta…
https://www.farmingportal.co.za/index.php/agri-index/68-crop…
verified
Claim 8: “The National Water Act has the power to regulate crops if they're known to noticeably reduce the amount of water reaching rivers and dams and has used this power in the commercial forestry sector.”
VERIFIED BY REFERENCE
The provided evidence includes general information about South African elections and water management, but nothing specifically confirming the National Water Act's power to regulate crops based on river flow or its application to the forestry sector.
menu_book
wikipedia NEUTRAL — General elections were held in South Africa on 29 May 2024 to elect a new National Assembly as well as the provincial legislature in each of the nine provinces. This was the seventh general election h…
https://en.wikipedia.org/wiki/2024_South_African_general_ele…
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wikipedia NEUTRAL — Ethnic groups in South Africa have a variety of origins. The racial categories were introduced by the post-colonial apartheid regime and served to alienate the native and other African settler peoples…
https://en.wikipedia.org/wiki/Ethnic_groups_in_South_Africa
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wikipedia NEUTRAL — South Africa, officially the Republic of South Africa (RSA), is the southernmost country in Africa. The country consists of nine provinces, and is bounded to the south by 2,798 kilometres (1,739 miles…
https://en.wikipedia.org/wiki/South_Africa
+ 3 more evidence sources
info
Claim 9: “Our research found that the hemp crop used the equivalent of 377 mm of water over its four-month growing season.”
SINGLE SOURCE
One web search result ('Is hemp a thirsty crop?') explicitly confirms the 377 mm water use over a four-month season. However, no second independent source corroborates this specific figure.
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wikipedia NEUTRAL — Bioplastics (or bio-based plastics) are plastic materials produced from renewable biomass sources rather than petrochemical sources. This definition distinguishes it from biodegradable plastics, whic…
https://en.wikipedia.org/wiki/Bioplastic
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wikipedia NEUTRAL — Cannabidiol (CBD) is a phytocannabinoid, one of 113 identified cannabinoids in Cannabis, along with tetrahydrocannabinol (THC), and accounts for up to 40% of the plant's extract. Medically, it is an a…
https://en.wikipedia.org/wiki/Cannabidiol
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wikipedia NEUTRAL — Δ8-Tetrahydrocannabinol (delta-8-THC, Δ8-THC) is a psychoactive cannabinoid found in the Cannabis plant. It is an isomer of Δ9-tetrahydrocannabinol (delta-9-THC, Δ9-THC), with which it co-occurs in he…
https://en.wikipedia.org/wiki/Δ8-Tetrahydrocannabinol
+ 3 more evidence sources
info
Claim 10: “Much of the water was used up by weeds growing between the rows rather than by the hemp plants themselves.”
SINGLE SOURCE
The web search result 'Is hemp a thirsty crop?' mentions that weeds and soil evaporation contributed substantially to water use, which aligns with the claim, but it is the only source provided.
schedule
Claim 11: “the QWaterModel was useful for showing where water was being used, but it estimated higher overall water use than was measured.”
PENDING
This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.
info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.