Sunday, November 13, 2016

Sunn Hemp the Organic Alternative


Sunn Hemp is another Hemp Plant that falls under the Radar as a solution to what ails the World


Sunn Hemp is another Hemp Plant that falls under the Radar as a solution to what ails the World

http://store.tecomate.com/blog/product-spotlight-march-24-2015-sunn-hemp/

Sunn Hemp Cover Crop Information
USDA: Organic Matter Builder Rotar and Joy (1983) reported:
  • ‘Tropic Sun’ sunn hemp reaching heights of over 4 feet in 60 days and over 6 feet in 90 days in Hawaii. 
  • Biomass production in Hawaii reached yields as much as 6,000 pounds in 60 days. 
Mansoer et al. (1997) conducted cover crop studies in Alabama and showed similar results.
  • ‘Tropic Sun’ was planted in August or early September after corn harvest and was grown as a cover 3 crop/green manure crop until wheat planting (early December).
  •  Biomass production achieved an average of 5,200 pounds in 9 to 12 weeks over a two-year study at two locations in Alabama. 
  • This compares with 4,300 pounds per acre with hairy vetch (Vicia villosa L.) and 4400 pounds with crimson clover (Trifolium incarnatum L.) (Mansoer et al., 1997). 
  • Ground cover from the “Tropic Sun” averaged approximately 96 percent at mowing and approximately 65 percent soil coverage 16 weeks later (mid-April). 
  • This amount of residue will provide erosion control and promote increases in organic matter accumulations in no-till or conservation tillage systems. 
  • In Alabama, Mansoer et al. (1997) reported an average of 126 pounds of nitrogen in 9 to 12 weeks. With this large amount of nitrogen produced, whether in spring, summer or fall, a crop such as small grain should follow sunn hemp to utilize the symbiotically produced nitrogen. 
  • However, in the study conducted by Mansoer et al. (1997), 38 percent of the N in biomass remained available for corn planted in mid-April, 16 weeks after the sunn hemp was mowed. 
Nitrogen Producer In Hawaii, Rotar and Joy (1983) reported:
  •  ‘Tropic Sun’ added 134 to 147 pounds of nitrogen per acre after 60 days of growth. 

Sunn hemp has bright yellow flowers that bloom at about 60 days. Due to its rapid growth and nitrogen-fixing capability, sunn hemp is gaining popularity as a cover crop in the Midwest. Photo by Molokai Seed Company https://mosesorganic.org/sunn-hemp/
Sunn hemp has bright yellow flowers that bloom at about 60 days. Due to its rapid growth and nitrogen-fixing capability, sunn hemp is gaining popularity as a cover crop in the Midwest. Photo by Molokai Seed Company https://mosesorganic.org/sunn-hemp/

Cover Crops as Carbon Sequestration

Cover crops, which are grown when fields are usually idle, can also be chopped and lightly worked into the top layer of soil – returning even more carbon to the ground. Johnson says this method can capture almost fifteen tons of carbon dioxide per acre.
JOHNSON: “About fourteen percent of the world’s cropland, if they adopted this approach to agriculture, you could capture all anthropogenic CO2.”
Johnson says sequestering carbon dioxide with this method would be relatively easy to implement and would cost about seventeen dollars per ton – less than other carbon capture techniques.

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