Monday, June 29, 2015

IndustrialHemp Methane Energy Yield Harvest Times


Anaerobic digestion of industrial hemp–Effect of harvest time on methane energy yield per hectare

Biomass and Bioenergy (Impact Factor: 3.41). 02/2011; 35(2):893-900. DOI: 10.1016/j.biombioe.2010.11.005

ABSTRACT There is a worldwide emphasis to increase the share of renewable transportation fuels. When using agricultural land for production of renewable transportation fuels, the energy output per hectare for different crops and transportation fuels is a crucial factor. In this study, the gross methane energy yield per hectare from anaerobic digestion of industrial hemp (Cannabis sativa L.), was determined at four different harvest times between July and October in Southern Sweden, a cold climate region. The biomass yield was determined for three years and the methane yield was determined for two years through the biochemical methane potential test.

  • The highest biomass yield, 16 tonnes dry matter per hectare on an average, and the highest methane energy yield per hectare was achieved when the hemp was harvested in September or October, with an average gross methane energy yield of 136 ± 24 GJ per hectare. 
  • There was no significant difference in the specific methane yield between the harvest times; the average being 234 ± 35 m3 per tonne volatile solids. 
  • Biogas from hemp turned out to be a high yielding alternative to the currently dominating renewable transportation fuels produced from crops grown in Sweden: ethanol from wheat and biodiesel from rapeseed.

Anaerobic digestion of industrial hemp–Effect of harvest time on methane energy yield per hectare (PDF Download Available). Available from: [accessed Jun 29, 2015].

Hemp Seed as Poultry Feed Page 13

Broilers-Up to 20% dried and crushed hemp seeds have been used successfully in broiler diets and resulted in higher breast, leg and thigh weight. This positive effect has been linked to the combination of a good protein and lipid quality associated to other beneficial properties, such as the lack of trypsin inhibitors and the antioxidant activity. Feeding broilers with hemp seed powder at 20% resulted in better feed conversion ratio, higher live-weight gain and lower age at slaughter, and lower mortality rate.

Laying hens With hens fed on 20% of cold-pressed hemp seed meal, no significant differences were found between feed treatments for egg production, feed consumption, feed efficiency, body weight change or egg quality. Increasing dietary inclusion of hemp seed meal produced eggs with lower concentrations of palmitic acid and higher concentrations of linoleic and alpha-linolenic acids

Reference: Khan et al., 2010), Silversides et al., 2005,

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Hemp Seed as Cattle and Ruminant Feed Page 12

Hempseed cake is a suitable alternative to soybean meal as a protein feed for growing cattle because hempseed cake gives similar growth and carcass traits as soybean meal. From the results with calves, there is an indication that hempseed cake gives a higher feed intake, similar growth and lower feed conversion compared to calves given soybean meal. Hemp seed-cake has been used for fattening cattle with gains reported at 6 pounds 9.2 ounces/3 kg/day & adult sheep 0.5 kg per day. The digestive system also works in a more balanced manner when feeding hemp seed cake compared to soybean meal which is shown by a higher faecal consistency and DM concentration and a smaller number of long particles in the faecal matter from the experiment with the steers (Reducing the Methane emissions).

Hemp Seed Nutritional Value Page 11

The nutritional composition of a hemp seed is incredible! In it's perfect organic natural state hemp seed is considered by many to be the safest, most digestible, balanced, natural and complete source of protein, amino acids, and essential fats found anywhere in nature. Hemp seed is 33% protein, 35% essential fatty acid, (Omega 3, 6, 9 and GLA), contains all 9 essential amino acids, has 6.2 x more Omega-3 than raw tuna. Abundant source of GLA, rich in trace minerals and also High in dietary fiber

Missouri Corn and Bean Acres Converted to Hemp Page 10

Bean Acres + Corn Acres equals 9,150,000 total acres

                               A. 10% converted to hemp= 915,000 acres
                               B. 20% converted to hemp= 1,830,000 acres
                               C. 30% converted to hemp= 2,745,000 acres

A: 915,000 acres
B. 1,830,000 acres
C. 2,745,000 acres
Fiber in Tons
Hemp Oil Raw Gals
Hemp seed cake Lbs
Gallons Biodiesel @80% recovery
$ 2.00 / gal
$3.00 / gal
$4.00 / gal
A: 27,084,000
$ 54,168,000
$  81,252,000
$ 108,336,000
B: 54,168,000
$ 108,336,000
$ 162,504,000
$ 270,840,000
C: 81,252,000
$ 162,504,000
$ 243,756,000
$ 325,008,000

Missouri Farm Size Crop Acres Page 9

Estimated Hemp yields using 2014 State Agriculture overview Missouri May 21,2015 (corn & soybean)

  • There are 97,700 farm operations that operate 28,300,000 acres, with an average farm size of 290 acres. The two main grain crops grown in the state are corn and soybeans for this estimate they will be used exclusively in the comparison to the estimated Hemp yield.

  • Soybeans 5,650,000 acres with 46.5 bushel per acre average, the soybean production has an estimated value of $2,604,000,000 or $10 per bushel. (Value of $465 / acre)

  • Grain Corn  3,500,000 acres with 186 bushel per acre average valued at $2,137,512,000 or $3.40 per bushel. (Value of $632,40 / acre)

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