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How To Plan Your Crop Rotation With Hemp?

Dale blog imageAuthor: Dale Hewett
How To Plan Your Crop Rotation With Hemp
Table of Contents (Scrollable)
Originally Posted on 27th May 2020

Hemp is the perfect plant for crop rotation. This is the process of rotating crops during a farming season to return plant nutrients to the soil without the use of synthetic fertilizers. For example, a farmer can grow one crop this year and another crop during the next. This process also stifles plant disease and pest cycles, improving the soil’s nutrient content and bolstering the farm’s biodiversity. 

Hemp is a superstar in the world of farming, offering two huge benefits. 

  • First, hemp is a fantastic cover crop that protects soil from erosion and leaching. The hemp plant gives back to the soil after using its nutrients, making it a sustainable crop. 
  • Second, industrial hemp can be a good source of revenue for farmers and can be sold for cannabidiol (CBD) oil production.

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As more consumers learn more about the use of hemp and its products, more farmers are also showing interest in how they can add this wonderful plant to their cultivation and crop rotation plan. In this article, we shall discuss the characteristics of the hemp plant and why adding hemp plants to your rotation plan could be the best thing to do for your farm.

What Is Hemp? 

Hemp is a hardy plant with a history of cultivation as old as humanity itself. We know that as early as 8,000 BC, people in ancient Mesopotamia (now Iran and Iraq) used hemp fabric. Alongside bamboo, hemp is one of the fastest-growing plants on the planet, making it perfect for textiles, paper, and animal feed. 

Hemp was so important to the English navy (it was used in lines and sailcloth) that American colonial farmers were required to commit a portion of their farmland to hemp cultivation. Past US presidents like Jefferson and Washington were also enthusiastic hemp growers.

As we proceed, there is a need to understand the major differences between hemp and marijuana. While both are members of the cannabis family of plants, they differ in their chemical content and growth pattern. 

One major difference between hemp and marijuana is the presence of tetrahydrocannabinol (THC), which is highly concentrated in marijuana. THC is the psychoactive compound responsible for the feelings of high when taking marijuana. Hemp still contains THC but in low concentrations. However, it has an abundance of other phytocannabinoids (plant-based cannabinoids) like CBD. 

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Crop Rotation Explained

Like hemp cultivation, the process of rotating crops has been around for a long time. It was born out of the need for farmers to increase the fertility of their fields and crop yields.

Crop rotation uses the give and takes mechanism of some plants to break the cycle of diseases and improve soil structure and biomass due to the diverse rooting systems of the crops planted. It is a sustainable way of keeping soil healthy without the use of toxic chemicals. 

Hemp’s rapid growth (it takes roughly three months for hemp to be ready for harvest) makes it perfect as a counterbalance for many major crops.

Why Should You Follow a Crop Rotation with Hemp?

Why You Should Add Hemp To Your Crop Rotation System

Throughout much of the 20th century, hemp cultivation was illegal in the US and many parts of the world due to its association with marijuana and its psychoactive properties.

These factors and more led to a ban on the cultivation, use, and distribution of marijuana. 

All this changed with the passing of the 2018 Farm Bill, which allowed for the broad cultivation of hemp and transfer of hemp-derived products across state lines. However, there are still restrictions in place, one being that industrial hemp flowers cannot contain more than 0.3% THC.

Today, more farmers are showing a greater interest in industrial hemp, both as a revenue source and as an option in their crop rotation system. We take a closer look at hemp’s benefits for farmers. 

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  1. Hemp Cultivation Adds Nutrients to the Soil

The hemp plant is equipped with the right tools — root system, nutrient need, and shape of the leaves — to add nutrients like potassium and nitrates to the soil. These nutrients are fixed into the soil to increase its nutrient level and yield on the field. 

To determine this effect of hemp on soil, a group of researchers conducted a controlled study where the cultivation of wheat immediately after hemp showed a significant increase in yields.

  1. Hemp Possesses a Strong Root-Ball and Long Taproot

Hemp possesses an unusually long taproot system (growing up to six feet in depth). This enables the plant to search for water tables deeper than most other plants can reach, reducing the level of competition for water and nutrients. This ability also makes the hemp plant drought-resistant. 

This long taproot system digs into the soil for nutrients and brings them closer to the surface, improving their availability for other crops. 

  1. Hemp Improves the Soil Structure and Texture

The long taproot system of hemp digs deep into the ground and loosens compacted soil, improving its biomass and aeration. Research shows that hemp produces high root biomass after harvest. This biomass tends to accumulate in soil areas where mineralization is limited, creating a sustainable cropping system.

Related Post: 5 Best Methods for Storing Hemp Biomass to Prevent Mold

  1. Possession of Dense Canopy Cover

The serrated leaves of hemp form a broad canopy that chokes out other plants, thus leaving the land weed-free and reducing the need for herbicides.

  1. Hemp Is a Phytoremediator

There’s a growing body of research on the use of plants to solve the problem of land pollution. This process — known as phytoremediation — involves using plants to “remove, transfer, stabilize, and/or destroy contaminants in the soil and groundwater.”

Plants used for phytoremediation can pull contaminants from soil and groundwater and store them in their leaves and shoots. They can also be metabolized and degraded into harmless compounds.

There are three important reasons why adding hemp to your crop rotation system promotes overall soil health.

  • First, hemp is a fast-growing crop and can absorb more contaminants and toxins much faster than other crops.
  • The long taproot system of hemp allows it to go deep into the soil and reach more contaminants and toxins. While most plants are only able to decontaminate the first few inches of the topsoil, hemp can drill down to over five feet.
  • Lastly, hemp is not affected by the heavy metal toxins that it absorbs. In fact, hemp can remove chemicals like selenium (a pollutant produced by industrial and agricultural activities).

What Crops Go Well with Hemp?

Hemp is not a nutrient-demanding crop. Some people will say you can grow hemp without any fertilizer, while others argue that it needs about as much help as corn.  In a crop rotation system, you can choose to replace beans or oats with hemp.

Hemp intercrops perfectly with turnips, hops, nettles, lupine, Brussel sprouts, broccoli, mustard, and corn. However, it is not advisable to intercrop hemp with plants like vetch, pepperweed, cress, spinach, and tobacco.

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Hemp performs excellently when grown after grains, grasses, vegetables, and fruits. Here’s what the USDA Farmers Bulletin No. 1935 has to say: “Fields previously cropped to soybeans, alfalfa, and clover are excellent for hemp. A good rotation is to follow corn with hemp, and in Kentucky, a fall cereal may follow the hemp.”

How Should You Plan Your Crop Rotation with Hemp?

How To Plan Your Crop Rotation With Hemp

Because hemp is resistant to disease, introducing hemp in a crop rotation system can help to reduce the incidence of pathogens in the soil. Hemp also suppresses the growth of weed and improves soil structure (as mentioned earlier).

When planning a rotation plan for your lands, always bear in mind that hemp responds well to preceding crops like peas, potatoes, or wheat but should not follow small grain or sod. Indian farmers plant hemp after coriander, tobacco, indigo, rice, or millet, and information from research has shown that hemp is excellent green manure for wheat.

To give you a clear example of how to include hemp in your crop rotation system, here is a five-year scheme of crop rotation for hemp, as suggested by Lyster Dewey.

Year/Plot 1st 2nd 3rd 4th 5th
One Hemp Corn Wheat Clover Grass
Two Hemp Onion, potato, or sugar beet Wheat Clover Grass
Three Corn Beans, peas Hemp Oats, barley clover

The hemp plant grows well in alkaline soil but may not do well on lands previously overgrown with huckleberry or sedges bushes since these weeds are indicators of acidic soil. 

The hemp plant secretes chemicals like coumaric, benzoic, ferulic, and caffeic acids that suppress the growth of weeds. Hemp cultivation requires no herbicides when the spacing is 16 inches or less. This is because the hemp plant will grow to suppress the weed. Wider spacing may require the addition of herbicides.

Including hemp in your crop rotation can protect potatoes from late blight. It also reduces the rate of infestation by stem nematodes. Growing beans with hemp protects them from being infected with brown spots. Hemp serves to protect sugar beets from turnip fleas and cabbage from white cabbage butterflies.

Key Takeaways

Adding hemp to your farm’s crop rotation process goes a long way to improving soil health. Hemp’s taproot system drills into the soil to improve the structure, aeration, and concentration of nutrients. This means the cultivation of hemp promotes soil fertility while boosting the growth of other plants. When introducing hemp into a crop rotation system, adequate care must be taken to choose the sequence of plants to be introduced before and after it.

To find more guides and insights on hemp cultivation, be sure to follow the New Phase Blends blog. We take pride in helping raise awareness of the importance of the hemp industry. Our products are sourced from high-quality raw hemp materials processed under laboratory conditions. 

All CBD oils, edibles, and topicals are reviewed by a third-party laboratory to verify their CBD content. We also work with reliable couriers to ensure that all orders arrive in our customers’ hands in perfect condition. Explore our product line today to learn more. 

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About the Author - CBD Expert Dale Hewett

Dale Hewett Author
Dale Hewett

Dale Hewett is the owner and founder of New Phase Blends. He discovered his passion for CBD use after suffering from injuries sustained while on Active Duty in the US Army. His number one priority is introducing the same CBD products that he himself uses for relief to others who can benefit from them.

Dale holds a Master Degree of Science, and is the inventor of the popular, CBD-based sleep aid known as ‘Sleep.’ He’s given multiple lectures on CBD to institutions such as Cornell’s MBA student program, and Wharton’s School of Business.

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