Table 4 Sinsemilla bud yields per square foot of garden canopy

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(Oven dry. calculated from the DEA data above.)

222 grams x 0.48 = 106.56 g (3.76 oz) ^ 9 square feet = 274 grams x 0.48 = 131.52 g (4.64 oz) ^ 9 square feet = 233 grams x 0.48 = 111.84 g (3.95 oz) ^18 square feet = 215 grams x 0.48 = 103.2 g (3.64 oz) ^ 9 square feet = Average plant canopy size: Average oven-dry bud yield per plant: Average oven-dry bud per square foot: Average air-dry bud* per square foot:

0.41 ounce 0.51 ounce 0.21 ounce

0.40 ounce

11.25 square feet 4 ounces 0.38 ounce 0.41 ounce

' Adds 10% moisture, per the IND suggestion)

GARDEN ADVERSITY Pollen, pests and plant problems

Contrary to cannabis' reputation as a weed, it is not so easy to grow quality medicine. Not all gardens have ideal conditions and few patients are trained botanists. The NIDA field data has a solid scientific basis, but it does not reflect all the realities a patient or caregiver faces in obtaining medical-grade cannabis. It is reliable for a mature female garden grown in optimum conditions, but several key factors must be clarified:

• The NIDA Mississippi garden was grown in ideal conditions with full sunlight and fertile, loose, well-drained soil. Many patient gardens are partially shaded or rely on soils of uncertain pH and quality.

• Trained scientists maintain the NIDA garden. Most patients and caregivers are self-taught from books, may overlook serious problems until too late, and seldom have access to expert advice when needed.

• Only mature female plants were considered in the study. Male plants were removed before NIDA made its

DRY SEEDED CANNABIS COMPONENTS

DRY SEEDED CANNABIS COMPONENTS

Table 5: Big plants can have reduced canopy yields

Source: Cannabis Yields. US DOJ / DEA. 1992. Table 2, page 3 Average Cannabis Yields at Maturity for Low Planting Densities

Table 5: Big plants can have reduced canopy yields

Source: Cannabis Yields. US DOJ / DEA. 1992. Table 2, page 3 Average Cannabis Yields at Maturity for Low Planting Densities

Sponsor

Year

Density

Gross Yield*

Seed Stock

DEA-A

1990

81 ft.sq.

777 grams (27.3 ounces)

Mexico

DEA-B

1990

81 ft.sq.

936 grams (32.8 ounces)

Mexico

DEA-C

1990

81 ft.sq.

640 grams (22.5 ounces)

Mexico

DEA

1991

72 ft.sq.

1015 grams (35.6 ounces)

Mexico

DEA

1991

36 ft.sq.

860 grams (30.2 ounces)

Mexico

* Yield = Dry usable leaf and bud from mature 120 day or older plants.

* Yield = Dry usable leaf and bud from mature 120 day or older plants.

Calculations using the DEA canopy yield formulae

* Whereas 48% of gross sinsemilla yield is bud, only 32% of seeded yield is bud. NIDA leaf plus bud yields A: 27.3 ounces foliage B: 32.8 ounces foliage C: 22.5 ounces foliage DEA: 35.6 ounces DEA: 30.2 ounces

Sinsemilla bud net x 0.48 = 13.1oz x 0.48 = 15.7oz x 0.48 = 10.8oz x 0.48 = 17.0oz x 0.48 = 14.5oz

Cannabis bud yields per square foot based on low density field data

NIDA leaf and bud yields Sinsemilla bud net Clean seeded bud

27.3 -f 81 sq' = 0.34oz/sq' x 0.48 = 0.16oz/sq.ft. x 0.32 = 0.11oz/sq.ft.

32.8 -f 81 sq' = 0.40oz/sq' x 0.48 = 0.19oz/sq.ft. x 0.32 = 0.13oz/sq.ft.

22.5 -f 81 sq' = 0.27oz/sq' x 0.48 = 0.13oz/sq.ft. x 0.32 = 0.09oz/sq.ft.

35.6 -f 72 sq' = 0.49oz/sq' x 0.48 = 0.24oz/sq.ft. x 0.32 = 0.16oz/sq.ft. 30.2 -f 36 sq' = 0.83oz/sq' x 0.48 = 0.40oz/sq.ft. x 0.32 = 0.27oz/sq.ft.

calculations. Statistically, half of all cannabis plants grown from seed are males with no medical value.

• Only healthy plants were considered. Plants that were sick or died were excluded from the study, but in a real garden this can be a very serious problem.

• NIDA had no loss to theft, pests or law enforcement.

• Unreliable police estimates were listed in the back.

Some gardens yield less than average. Some patients need to grow or store more than a year supply at a time for security issues or as a hedge against crop failure.

When seedless (sinsemilla) cannabis goes to seed, the quality drops and net yield of bud goes down by a third (see chart). Female plants may suddenly become hermaphrodite and grow male flowers. Deer, rodents and snails snack on young plants and can destroy an entire garden. White fly, spider mites, mealy bugs, thrips, aphids and scores of other insects feed on cannabis. A power failure can wipe out an indoor crop light cycle. Molds, fungus and mildew may attack a crop at any time, but are most common just before harvest and can make an entire crop unusable. Floods, frost and other bad weather can destroy an entire garden.

Table 5 on the left, using data from the DEA study, shows that even big plants may produce less than an eighth of an ounce per square foot. After you remove seeds, that leaves a tenth of an ounce — 1/5 as much as its projected yield, and requiring 500 square feet to obtain three pounds of bud and 1000 square feet for six pounds.

Despite its variables and shortcomings, the best way to estimate crop yields is still measured by the acre — or, in the case of cannabis bud, by the square foot.

Clean seeded bud x 0.32 = 8.7oz net x 0.32 = 10.4oz net x 0.32 = 7.2oz net x 0.32 = 11.4oz net x 0.32 = 9.7oz net

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