For profitable hemp farming, particularly deep, humus-rich, nutrient-rich soil with controlled water flow is preferable. Waterlogged acidic, compressed or extremely light (sandy) soils primarily affect the early development of plants. Steep and high altitudes of more than 400 m above sea level are best avoided. Hemp is relatively insensitive to cold temperatures and can withstand frost down to −5 °C. Seeds can germinate down to 1–3 °C. Hemp needs a lot of heat, so earlier varieties come to maturation. The water requirement is 300–500 l/kg dry matter. This is around 1/14th that of cotton, which takes between 7,000 and 29,000 l/kg, according to WWF. Roots can grow up to 3 feet into the soil and use water from deeper soil layers.
Eating shelled hemp seeds, or hemp hearts, is as simple as sprinkling a spoonful or two into smoothies or on top of cereal, salads, or yogurt, says Kelly Saunderson of Manitoba Harvest Hemp Foods, the world's largest hemp foods manufacturer. People with gluten sensitivity can use hemp seeds as a substitute for breadcrumbs to coat chicken or fish. Just like you can blend almonds and water to make almond milk, you can do the same with hemp seeds for hemp seed milk, which you can use as an alternative to dairy milk in drinks and recipes. And because of its nutty flavor, hemp seeds make a great substitute for people with nut allergies—you can dry-toast them over low heat to bring out even more of that nuttiness.
Cannabis sativa L. subsp. sativa var. sativa is the variety grown for industrial use, while C. sativa subsp. indica generally has poor fiber quality and female buds from this variety are primarily used for recreational and medicinal purposes. The major differences between the two types of plants are the appearance, and the amount of Δ9-tetrahydrocannabinol (THC) secreted in a resinous mixture by epidermal hairs called glandular trichomes, although they can also be distinguished genetically. Oilseed and fiber varieties of Cannabis approved for industrial hemp production produce only minute amounts of this psychoactive drug, not enough for any physical or psychological effects. Typically, hemp contains below 0.3% THC, while cultivars of Cannabis grown for medicinal or recreational use can contain anywhere from 2% to over 20%.
One claim is that Hearst believed[dubious – discuss] that his extensive timber holdings were threatened by the invention of the decorticator which he feared would allow hemp to become a cheap substitute for the paper pulp used for newspaper. Historical research indicates this fear was unfounded because improvements of the decorticators in the 1930s – machines that separated the fibers from the hemp stem – could not make hemp fiber a cheaper substitute for fibers from other sources. Further, decorticators did not perform satisfactorily in commercial production.
Hemp seeds -- sometimes called "hemp hearts" -- are sprinkled on foods, pressed for oil, ground into protein powder and made into milk. Afraid of psychotropic side effects? Don't be. While these small, pale-beige to dark-brown seeds form the edible part of the hemp plant (aka pot, ganja, weed, grass, Mary Jane, doobage), they don't contain THC, the active drug found in hemp leaf.
There are no known allergic reactions to hemp seed, but the contact that the seeds may have had with THC-covered plant parts could result in small residues of THC on the seeds. This means that you could possibly experience the feeling of being “high” or under the effect of the psychotropic chemical. This effect of hemp seed is quite rare and isn’t harmful, but it can be an uncomfortable feeling if not anticipated.
The world-leading producer of hemp is China, which produces more than 70% of the world output. France ranks second with about a quarter of the world production. Smaller production occurs in the rest of Europe, Chile, and North Korea. Over 30 countries produce industrial hemp, including Australia, Austria, Canada, Chile, China, Denmark, Egypt, Finland, Germany, Greece, Hungary, India, Italy, Japan, Korea, Netherlands, New Zealand, Poland, Portugal, Romania, Russia, Slovenia, Spain, Sweden, Switzerland, Thailand, Turkey, the United Kingdom and Ukraine.
As of 2011, hemp seeds are not known to cause any interactions with common medications, but you should talk to your doctor or naturopath about any over-the-counter or prescription drugs you are taking before adding hemp seeds to your diet. Blue Shield of California recommends caution to anyone taking anticoagulant drugs, since hemp seeds inhibit platelets and may pose a bleeding risk.
In Western Europe, the cultivation of hemp was not legally banned by the 1930s, but the commercial cultivation stopped by then, due to decreased demand compared to increasingly popular artificial fibers. Speculation about the potential for commercial cultivation of hemp in large quantities has been criticized due to successful competition from other fibers for many products. The world production of hemp fiber fell from over 300,000 metric tons 1961 to about 75,000 metric tons in the early 1990s and has after that been stable at that level.
Separation of hurd and bast fiber is known as decortication. Traditionally, hemp stalks would be water-retted first before the fibers were beaten off the inner hurd by hand, a process known as scutching. As mechanical technology evolved, separating the fiber from the core was accomplished by crushing rollers and brush rollers, or by hammer-milling, wherein a mechanical hammer mechanism beats the hemp against a screen until hurd, smaller bast fibers, and dust fall through the screen. After the Marijuana Tax Act was implemented in 1938, the technology for separating the fibers from the core remained "frozen in time". Recently, new high-speed kinematic decortication has come about, capable of separating hemp into three streams; bast fiber, hurd, and green microfiber.
While hemp seeds are grown in many parts of the world, its major producers include Canada, France, and China. Hemp has been prohibited from cultivation in the United States since about 1950. Despite its value, the U.S. government doesn't recognize the differences between industrial hemp and marijuana. In fact, the U.S. Drug Enforcement Agency, or DEA, classifies all varieties of Cannabis as marijuana, making industrial hemp just as illegal regardless of its use.
In the UK, the Department for Environment, Food and Rural Affairs treats hemp as a purely non-food crop, but with proper licensing and proof of less than 0.2% THC concentration, hemp seeds can be imported for sowing or for sale as a food or food ingredient. In the U.S., imported hemp can be used legally in food products and, as of 2000, was typically sold in health food stores or through mail order.
Since hemp seed is very low in sodium and calories and is a complete protein, it can be eaten in large quantities without fear of gaining too much weight. Complete proteins make the body feel full because all of the necessary amino acids have been taken in through food, thereby inhibiting the release of ghrelin and curbing hunger pains. This reduces the chances of overeating and subsequent weight gain. Also, fiber makes the body feel full and stimulates good digestion and fast passage of bowels, which can reduce weight and increase the efficient absorption of nutrients.
Hemp seed has a wide range of effects on heart health, including the proper balance of cholesterol or fatty acids in the body. Most specialists recommended a specific balance of 3:1 or 4:1 omega-6 fatty acid to omega-3 fatty acid. According to Dr. Delfin Rodriguez Leyva’s, ( Department of Physiology, University of Manitoba and Institute of Cardiovascular Sciences, St Boniface Hospital Research Centre, Canada) report in the Nutrition and Metabolism Journal, this seed is one of the only plant substances in the world where this is the normal balance already. The proper balance of saturated fats in the body is essential to the normal functioning of the body, and the prevention of various conditions, including atherosclerosis, heart attacks, and strokes. Furthermore, since this seed has a high content of fiber, heart health is further boosted because fiber scrapes off excess cholesterol from the artery walls that also lead to heart conditions, and takes them to the excretory system where they can be processed and eliminated.