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Purdue University Hemp Research

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http://www.purdueexponent.org/campus/article_5076336e-3999-5e60-beb6-704702007626.html

Article in Purdue Exponent newspaper about 3rd year of research. Purdue Botany and Plant Pathology professor and extension researcher Dr. Janna Beckerman has some comments.

Hemp is a crop that grows like any other, but with more legal boundaries.
Purdue’s Agriculture personnel have been growing and researching hemp since 2015. They hosted their second Industrial Hemp Field Day on Thursday at Meigs Farm, south of Lafayette.
Janna Beckerman, field day organizer and professor of botany and plant pathology, said she has seen limited change for hemp due to being in the “murky legal realm” but that the public is becoming more accepting, which stems from more education.
“I’d like to see this going in as something that growers would consider in rotation, similar to wheat,” she said. “(Hemp) has more of a role than what we currently have it used for. Of course, the federal government has to legalize it first, and all of those ‘little’ details.”
This year’s field day, those who have been working with the hemp fields gave presentations about the potential challenges and opportunities growing hemp can have for one’s business.
Leah Sandler is a doctoral student working with Kevin Gibson, professor of botany and plant pathology, to reintroduce industrial hemp into the Midwest. Sandler said Indiana was one of the leading producers of hemp in the United States before it became illegal 70 years ago.
So, the knowledge of how to grow industrial hemp in this type of climate has dwindled. She and her colleagues are researching the various types of industrial hemp to determine which would be best suited here.
Purdue is researching eight variations, or cultivars — six seed varieties from Canada and two fiber varieties from Europe — according to Sandler.
“Hemp is a day length-dependent crop, which means that flowering is induced at a certain amount of hours of daylight,” Sandler said. “We were curious as to how they would grow here, since we were getting all of our seeds from Canada, which is at a much farther northern latitude.”
To research effectiveness, Sandler’s group planted seeds on different dates to monitor how it would affect the growth of the plants.
“The idea being, the earlier you planted it the more growth you could get, the more robust your yield, because it’s produced more,” she said. “What we’ve found ... is that this doesn’t seem to be the case. The hemp seems to flower at about four weeks after we plant it, regardless of when we plant it, regardless of the day length.”
The hemp seeds grown can be tested for composition, but according to Indiana law, they must be destroyed afterward.
Many who attended the field day asked questions regarding hemp’s tetrahydrocannabinol and cannabidiol content, and how it could be compared to marijuana’s properties.
“Legally, hemp has to have 0.3 percent of THC content or below, to be legally grown; however, hemp in general has very low THC content, but a higher CBD content,” she said.
Marijuana, on the other hand, has high THC and low CBD, she said; Purdue Ag does not study marijuana.
“The key difference (between hemp and marijuana plants) is that hemp does not have a significant amount of THC,” said Marty Mahan, agricultural director for the Indiana Hemp Industries Association. “And other than that, there is no difference.”
Mahan was sitting at an INHIA booth during the field day. He said he is seeing a shift in the industry, because when he first became involved, its No. 1 priority was “to get people to understand that there was a difference between marijuana and hemp — and I don’t feel like that’s necessarily the case anymore.”
But INHIA volunteer Michelle Lennis said she is still surprised by how many people don’t know there is a difference.
“As popular as it seems, you still get a lot of people who just can’t understand that it’s a separate plant,” she said.
Mahan said he finds the need for explanation is dwindling as he sees public acceptance of hemp growing. This is especially true when looking at hemp-related legislation.
“(Hemp legislation) is much more interest-driven than education-driven,” he said. “If it’s not about corn or soybeans, they don’t care, they’re not interested. ... They just don’t see it as a commodity like they do with other crops.”
During last year’s field day, Beckerman said she saw some odd businesses and mildly interested people come in, but this year it seemed more focused.
“They’re starting to realize this is an agricultural enterprise and that you need to have that background to go into it,” she said. “You’re not going to buy a bag of seed and cast it like chicken feed. And when we started, I really do think we had people who thought that.”
One interested woman who attended was Gail Hale, who came with her husband, Stephen, from Bloomington.
The Hales, both Purdue alumni, have gone through two major careers and attended the event to see about branching out. Hale works with fibers to create artwork, and although she and her husband “can’t grow anything,” she is excited by opportunities hemp presents.
“We work with a lot of young people doing tours of (Bloomington) orchards, and they’re all into organic stuff,” she said. “This (field day) gives us some hope for something good to happen that can boost the economy and give these young people the know-how to grow.”
Hemp research and education is something Beckerman said should grow in prominence in the Midwest — but support from other research agencies is crucial.
“This really is a ‘joint’ effort,” she said with a laugh.


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Read up on what they've found out in their research! https://purduehemp.org/


<article class="post-29 page type-page status-publish entry override" itemscope="" itemtype="https://schema.org/CreativeWork"><header class="entry-header">Hemp Production

</header>Types of Hemp: Industrial hemp is composed of three types: Oilseed, fiber, and hybrid (dual purpose), which produces both fiber and seed, but not to the yield or quality of single purpose cultivars.
Hemp Growth and Development: Hemp is a short day plant. Short-day plants develop flowers only when the day length is less than about 12 hours (about August in Indiana). For best results in Indiana, earlier planting will promote greater vegetative growth resulting in more robust plants for seed, and in taller plants with higher fiber yields. Days begin to get shorter after June 21<sup>st</sup>, and approximately four to five weeks after this date, vegetative growth slows and flower development is triggered.
Hemp is dioecious, meaning plants can be male or female. Differences between male and female plants in growth rate and development are large (Van der Werf and Van den Berg, 1995). Male plants tend to flower and senesce (die) earlier. To minimize the impact of this on production, many cultivars are bred to be monoecious, resulting in plants that are mostly females (a small percentage of males plants are included for pollination), to harvest more seed (since male plants do not set seed) and greater fiber productions (since male plants die after flowering).
Male Flower Close up


Male flower (mature) releasing pollen


Female flower




Soil: One common myth is that hemp can be grown anywhere. Hemp grows best on a loose, well-aerated loam soil with high fertility and abundant organic matter, with a pH of 6.0-7.5. Well-drained or tiled clay soils can be used, but poorly-drained clay or poorly structured soils often results in establishment failures, as seedling and young plants are prone to damping-off. Sandy soils can grow good hemp with adequate irrigation and fertilization but these additional costs often makes production uneconomical.
Planting Date: Although the seedlings will germinate and survive at temperatures just above freezing, soil temperatures of 46°–50°F are preferable. Generally hemp should be planted after danger of hard freezes, and slightly before the planting date of corn. Good soil moisture is necessary for seed germination, and plenty of rainfall is needed for good growth, especially during the first six weeks, for establishment. Rainfall should be about 25-30 inches per year, but is most important in the first six weeks.
Planting Depth: Seedbed preparation requires considerable effort. Fall plowing is recommended, followed by careful preparation of a seedbed in the spring. The seedbed should be fine, level, and firm. Seed is best planted at 0.75-1.25 in (although deeper plantings will be tolerated, they are more susceptible to damping-off).
Plant Rate and Row Width. Seeding rate is specific to each variety, and this information should be sought from the supplier. Industrial hemp is normally planted using a standard grain drill. Both oil and fiber hemp is typically planted in 6-7-in. rows, using every run of the drill.
Oil Seed: As per other seed crops, plants are direct seeded at a rate of approximately 25-40 lb/acre. There are approximately 27,000 seeds per pound. Competition between plants is minimized to produce the highest quality seed and oil. For grain production, desired final plant population is around 10-15 plants/sq. ft.
Fiber: Fiber crops are planted at a rate of approximately 40-80 lbs per acre. This could be higher if germination is low or seeds are large. This high density is needed to produce higher quality primary bast fibers, as opposed to core fibers. The bast fiber content increases with plant density , but optimal densities have not yet been established in Indiana. Large quantities of hemp seeds must be planted to establish optimal crop density, and suppress weed competition. However, it is important to recognize that difficulties may also result from plant competition. Final stand density should be approximately 30-35 plants per square foot for fiber.
Hybrid: Densities for seed production for tall, European, dual-purpose cultivars are less than for short oilseed cultivars.
When hemp is planted on good draining, fertile loam with appropriate temperature and moisture conditions, seed will germinate quickly and reach 12 inches in 3-4 weeks from planting. At this stage it will give 90% ground shade and suppress the growth of weeds by shading. Rapidly growing hemp at a density of approximately 20 plants/sq ft, will suppress nearly all weed growth.
Fertility: Another myth regarding hemp production is that it doesn’t require additional nitrogen or potash inputs: Hemp production requires inputs of up to 100-130 lb of nitrogen/ acre, 45-70 lb/acre phosphorus, and 35-80 lb/acre of potash (to keep potassium levels in a medium to high range of >250 ppm). Hemp particularly requires good nitrogen fertilization, more so for seed production than fiber. Phosphorus levels should be medium to high (>40 ppm), sulfur good (>5,000 ppm), and calcium not in excess (<6,000 ppm). In addition to well aerated, loamy soils, hemp does best when organic matter greater than 3.5%. To provide perspective–Hemp requires about the same fertility inputs as a high-yielding crop of wheat, or corn.
fertility-1024x297.png

Hemp Rotations: Hemp can be successfully grown in continuous rotation for several years on the same land. However, the risk of pest buildup, particularly root worms, borers, and rots, makes this a risky proposition. Hemp could be used to diversify current rotations of bean, wheat, or alfalfa. Based upon reports from Ontario, Canada, it has been recommended that hemp not follow canola, edible beans, soybeans or sunflowers due to the risk of white mold and other pests and diseases.
Pest Management. Like most plants, hemp is prone to insects and pathogens. As the acreage of industrial hemp increases, the number of insect pests and pathogens will tend to increase, as well.
Disease. Historically, the fungal pathogens gray mold (Botrytis cinerea) and white mold (Sclerotinia sclerotiorum) have been reported to infect and impact industrial hemp production. In Indiana, white mold in particular, is expected to be a major pest north of highway 70, particularly when soybeans are grown in adjacent locales, or in rotation with hemp. Hemp is also prone to numerous fungal and bacterial leaf spots, viruses, and Pythium root rot and blight during establishment.
Insects. European corn borer, armyworm and grasshoppers have done some damage to hemp crops in North America.
No pesticides (insecticides, herbicides or fungicides) are registered for use on hemp in the United States. For now, crop rotation is the only management option available to avoid disease build-up until more is known about hemp’s susceptibility to disease organisms. A 4-year rotation is recommended. Do not grow hemp on the same fields following canola, edible beans, soybeans or sunflowers.
References:
Baxter, J. 2000. Growing Industrial Hemp in Ontario. Agdex# 153/20. Available at http://www.omafra.gov.on.ca/english/crops/facts/00-067.htm#fertility
Van der Werf, H.M.G. and W. Van den Berg. 1995. Nitrogen fertilization and sex expression affect size variability of fibre hemp (Cannabis sativa L.) Oecologia, 103: 462–470
Small, E. and D. Marcus. 2002. Hemp: A new crop with new uses for North America. p. 284–326. In: J. Janick and A. Whipkey (eds.), Trends in new crops and new uses. ASHS Press, Alexandria, VA.

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Oregonism

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So far, all hemp that shows a monoecious phenotype and is still 2n=20 genetically have all been female with no male marker present MADC32. Kinda interesting.....

In that vein OregonCbd has been pushing Day Neutral [autoflower] reversed [feminized] hemp seed. Basically for terroir purposes.

Shunning the male has become the new era of hemp in search of a commodity....full spectrum has been mainly ditched for single terpenoid dominant varieties....bleh
 
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