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Title: USDA Farmers' Bulletin No. 1935: Hemp
Author: B. B. Robinson
Release Date: May 28, 2019 [EBook #59625]
Language: English
*** START OF THIS PROJECT GUTENBERG EBOOK USDA FARMERS' BULLETIN NO. 1935 ***
Produced by Tom Cosmas compiled from images made available
by The Internet Archive.
Transcriber Note
Text emphasis is denoted as _Italics_ and =Bold=. Whole and fractional
parts of numbers a s 12-3/4.
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| FARMERS' BULLETIN No. 1935 |
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| U. S. DEPARTMENT OF AGRICULTURE |
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CONTENTS
Page
_Caution_ 2
_HEMP_ 3
_What it is_ 3
_It grows well in corn belts_ 4
_How to grow it_ 5
_Soils and Fertilizers_ 5
_Seed_ 6
_When to plant_ 6
_Seeding_ 6
_Culture_ 7
_Varieties to grow_ 7
_Enemies_ 8
_Harvesting_ 8
_Time to Harvest_ 8
_Machinery_ 9
_Retting_ 10
_Underretting and Overretting_ 11
_Sunburning_ 11
_Turning Soils_ 11
_Testing the End Point of the Ret_ 12
_Picking Up the Retted Stalks_ 14
_Extra Care Insures Extra Profits_ 15
_Yeilds_ 16
_Caution_
The HEMP PLANT contains the drug marihuana. Any farmer planning to grow
hemp must comply with certain regulations of the Marihuana Tax Act of
1937. This involves registration with the farmer's nearest Internal
Revenue Collector and the payment of a fee of $1. Although the fee is
small, the registration is mandatory and should not be neglected, as
the penalty provisions for not complying with the regulations are very
severe. The registration must be renewed each year beginning July 1.
This so-called "license" permits a farmer to obtain viable hempseed from
a registered firm dealing in hemp, to plant and grow the crop, and to
deliver mature, retted hemp stalks to a hemp mill.
Washington, D. C. Issued January 1943
Slightly Revised April 1952
_HEMP_
By B. B. Robinson, _Senior Agrononmist_
_Division of Cotton and Other Fiber Crops and Diseases Bureau of Plant
Industry, Soils, and Agricultural Engineering Agricultural Research
Administration_
HEMP is a fiber used in making twines and light cordage. It is also used
as an extender for imported cordage fibers, particularly abaca, sisal,
and henequen, when supplies of these are not adequate to meet domestic
demands. The size of the hemp industry, therefore, is greatly influenced
by the availability of imported cordage fibers.
Hemp is not a hard crop to grow. It should be planted on the most
productive land on the farm--land that would make 50 to 70 bushels of
corn per acre.
The crop is planted with a grain drill and harvested with special
machinery rented from hemp mills.
It is allowed to lie on the ground until the outer part of the stalks has
rotted, freeing the fibers. This process is called dew retting.
The most important step in hemp farming is to stop the retting process at
the proper time. (See pp. 12 and 13.)
This bulletin tells how to grow and harvest hemp. For more information
write to the Bureau of Plant Industry, Soils, and Agricultural
Engineering, United States Department of Agriculture, or to your State
experiment station, or consult your county agent.
_What it is_
Hemp is an annual plant that grows from seed each year, and therefore it
can be brought readily into production. It produces twice as much fiber
per acre as flax, the only other fiber that is its equal in strength and
durability and that is known to be suitable for culture and preparation
on machinery in this country.
When hempseed is sown thickly for fiber production, the plants usually
grow from 5 to 8 feet tall. However, when the plants are thinly spaced in
rows for seed production, they may, under favorable conditions, reach a
height of 12 to 16 feet. If the plants are not crowded, they become much
branched and are bushy. Uniform stems approximately 3/8 inch in diameter
and 5 to 8 feet long are especially desired for fiber production, because
they can be handled well by the harvesting and processing machinery
available in this country.
[Illustration]
Hemp is a dioecious plant, that is, the staminate (male) and pistillate
(female) flowers are borne on separate plants, rather than both on one
plant. The flowers of the two types of plants are different, but the male
plant is easily distinguished from the female, as the anthers are about
the size of a wheat kernel. The male plants die soon after discharging
their pollen; this is usually about 3 to 5 weeks before the female plants
mature seed and die.
The fiber of commerce ranges from 4 to 8 feet in length and has the
appearance of a flat, fine ribbon. It lies very close to the epidermis or
skin of the plant. Spinners desire the fiber ribbon 1/16 inch or less in
width. The long strands of fiber are called "line" fiber to distinguish
them from "tow" fiber, which consists of shorter, broken, tangled pieces.
_It grows well in the Corn Belt_
Hemp is recommended as a good crop for the Corn Belt States, because of
their favorable climatic and soil conditions.
Most fiber-producing varieties of hemp require a frost-free growing
season of 5 months or longer to produce seed and approximately 4 months
for fiber production. Hemp will endure light frosts in the spring and
survive frosts in the fall better than corn. It grows best when well
supplied with moisture throughout its growling season and especially in
its early stages of growth. Drought conditions, if accompanied by high
temperatures, appear to hasten maturity before the plants are fully grown.
The vegetative growth of hemp should be uniform. This growth is
noticeably affected if the soil is flooded or saturated with moisture for
too long a period. The leaves turn yellow, and the plants die. Rainfall,
well distributed during the growing season, is, therefore, desirable for
uniform vegetative growth. Hemp should be planted only on well-drained
soils and not on flat, heavy, impervious soils.
Climate is important not only in the growth of the plant but also in the
preparation of the crop after harvest. It influences the method used in
handling the crop and the labor requirements, which determine the cost
of production. In the United States the common practice (known as dew
retting) is to cut the crop and let it lie on the ground. Exposure to the
weather causes the fiber in the outer part of the stem to separate. Light
snows and alternate freezing and thawing seem to improve or make the
retting more uniform.
_How to grow it_
=Soils and Fertilizers=
Hemp should not be grown on poor soils. To obtain good yields and fiber
of high-quality, it is necessary to have a growth of uniform stalks 6 to
8 feet long. Short stalks, from poor nonfertile soils, seldom produce a
high-quality fiber.
Fiber hemp grows successfully on soils of the Clarion, Tama, Carrington,
Maury, Hagerstown, and Miami series, which, in general, are deep,
medium-heavy loams, well-drained, and high in organic matter.
Artificially drained areas of the Webster, Brookston, and Maumee series
also give satisfactory yields. These soils are among the most productive
soils of the Corn Belt. They produce average yields of 50 to 70 bushels
or more of corn per acre. If land will not produce from 50 to 70 bushels
of corn per acre, it should not be planted to hemp for fiber production.
Muck or peat soils are not recommended for the production of high-quality
hemp fiber. The quantity of fiber produced per acre on these soils may be
very high, but experience has demonstrated that the fiber lacks strength,
which is the first requirement of hemp fiber for good cordage.
The inexperienced farmer usually gets advice from an experienced
hemp-mill superintendent in the selection of the right soil. In fact, the
farmer's contract to grow hemp usually specifies the exact field that it
has been mutually agreed should be used for the hemp crop. This type of
supervision by the company contracting for hemp has helped to prevent
many crop failures.
Hemp should not be grown continuously on the same soil, for the same
reasons that many other crops are not adapted to such practices. In
Wisconsin, fields previously used for a cultivated crop are selected
for hemp planting in preference to ones upon which small grains have
been grown. In Kentucky, bluegrass sod, if obtainable, is selected. Old
pastures plowed up are well suited for hemp culture. 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.
Although hemp requires a rich soil, it does not remove from the farm an
excess of plant-food material. Nearly all the leaves on the hemp plants,
containing much of the plant nutrients removed from the soil, fall
off during the growth and maturing of the plant. The remaining leaves
may drop off in the field during the process of retting. Further, the
plant stems lose about 20 percent in weight of soluble and decomposed
materials, which leach out upon the fields, and the stubble may be plowed
under. The plant in this manner returns to the land a large part of the
plant nutrients that it removes during its growth.
Commercial fertilizers may be used to advantage on soils that are not
well supplied with organic matter. Ordinarily, the best fertilizer
for hemp is barnyard manure, but commercial fertilizer can be used to
advantage to supplement manure. Lime applications may be supplied on acid
soils to advantage. Consult your county agent for recommendations as to
amounts of fertilizer and lime to apply.
=Seed=
The period of flowering of the hemp plant may extend over several weeks,
and as a result the seed does not all mature at one time. Hemp seed
for sowing frequently contains some immature green to yellowish-green
seeds that may not germinate well. Good hempseed for sowing should be
relatively free of such seeds and should germinate 90 percent or better.
As the oil content of hempseed usually ranges between 29 and 34 percent,
the seed should be kept cool and dry, as it spoils rapidly under warm
and damp conditions. Hemp seed seldom retains its germinating power well
enough to be used for seed after 2-years' storage.
=When to Plant=
Hemp should be planted in the spring just before corn. In a program
calling for small spring grains and corn, the farmer should plan to plant
his hemp between the time he plants his small grains and the corn.
=Seeding=
Hemp grown for seed production should be sown in rows or hills. The hills
are commonly spaced 5 by 5 feet, with 6 to 10 seeds to the hill, planted
not more than 1/2 inch deep. The plants are thinned to 3 to 5 to a hill.
If care is taken to save seed, about 1-1/2 pounds wall sow an acre. Most
farmers use more seed, and frequently the crop is replanted because of
late floods or failure to obtain good stands.
Hemp grown for fiber should be sown with a broadcast seeder or with a
grain drill. A drill with 4 inches between drill tubes is preferred to
one with 6 inches or more. The seed should not be planted deeper than 1
inch, and a depth of 1/2 inch is preferred. If the seed is planted deep,
the hemp seedling is not capable of pushing its way to the surface of the
ground. A slight crust on the ground frequently results in a poor stand.
If the seedbed is loose, disks on a seed drill may cut too deep into the
soil and the seed will be sown more than 1 inch deep. In such cases, to
make certain that the disks do not cut too deep into the seedbed, they
should be tied to the seed box.
A standard bushel of hempseed weighs 44 pounds. The rate of seeding hemp
for fiber production ranges between 3 and 5 pecks of seed per acre. In
Kentucky, where hemp is hand-broken, it has been the practice to sow 3
pecks (33 pounds) per acre. However, when the hemp is to go to the mill,
1 bushel per acre gives a product that is better suited to milling.
Wisconsin and other Corn Belt farmers have commonly sown 5 pecks per
acre. The lighter rate of seeding in Kentucky produces larger stalks.
These stalks are easily broken, and the fiber is easily prepared by the
hand-breaking methods that have been used there since colonial days.
Machine methods of breaking and scutching to prepare the fiber are used
in Wisconsin, and recently to some extent in Kentucky. The machines will
handle finer stems, and the sowing of 5 pecks is advisable where hemp is
to be prepared by machine.
[Illustration]
A good practice in planting hemp for fiber production is to sow around
the edge of the field next to the fence a 16- to 18-foot width of small
grains, which may be harvested before the hemp. Space is thus provided
for the harvester to enter the field and begin cutting without injuring
the hemp. It also prevents hemp plants at the edge from growing too rank.
Uniform plants are necessary for uniform fiber quality.
=Culture=
Fall plowing in Wisconsin gives better results with hemp than spring
plowing.
Hemp for fiber production requires little or no cultivation or care
after planting until the harvest; but if, after seeding and before the
seedlings emerge, the ground crusts badly it may be advisable to roll the
field to break the crust. Hemp for seed production should be cultivated
the same as corn; that is, sufficiently to keep back the weeds. Spudding
out Canada thistles where they appear in dense stands in hemp fields
should be done when the hemp is only a few inches high. In most cases
hemp will compete well with weeds, if the hemp gets off to a good start.
_Varieties to grow_
The fiber hemp grown in the United States by the early colonists was of
European origin; but our present hemp, commonly known as Kentucky or
domestic hemp, is of Chinese origin. Few importations of hempseed have
been made in recent years for commercial plantings, as imported seed has
not proved as productive under domestic conditions as Kentucky hemp.
_Enemies_
In the United States there are no hemp diseases of economic importance,
and hemp has not been seriously attacked by insects. The European corn
borer and similar stem-boring insects occasionally kill a hemp stem.
However, they have not proved important, perhaps because hemp has not
been grown to any extent in the sections of the United States where the
European corn borer is a serious pest. Seedling plants are frequently
attacked by cutworms and white grubs after spring plowing of sod land.
Broom rape is a small weed 6 to 15 inches high that is parasitic on the
roots of hemp, tobacco, and tomatoes, it usually grows in clumps and has
purple flowers, which produce many very small seeds. These adhere to the
waxy flower parts surrounding the hempseed and are distributed in this
manner. Broom rape can be very serious on hemp if proper control measures
are not followed. Only well-cleaned hempseed and seed from fields
containing no broom rape should be sown.
Hemp has been recommended as a weed-control crop. Its dense, tall
growth helps to kill out many common weeds. The noxious bindweed, a
member of the morning-glory family, is checked to some extent by hemp.
Unfortunately, bindweed and several other species of morning-glory
have seeds so near the same size and weight of hempseed that mixtures
obtained in producing hempseed are carried to the field planted for fiber
production. In growing hemp for seed all vine weeds of this type found on
the hemp stalks should be removed before the hemp plants begin to produce
seed.
[Illustration]
_Harvesting_
=Time to Harvest=
Hemp is harvested for seed production when the plant on being shaken
sheds most of its seed. This occurs when the seeds are fully mature on
the middle branches. The seeds will mature on the lower branches first
and on the top of the plant last. The common method of harvesting hemp
for seed production is to cut it by hand and shock it to permit more seed
to mature and cure before threshing. The harvesting should be in the
early morning or on damp days when the seeds do not shatter so much as
they do in the warmer and drier part of the day. Threshing of the seed
hemp should be done on dry afternoons. In threshing, the seed shocks
should be placed on large canvas cloths 24 by 24 feet and then be beaten
with long sticks to remove the seed.
Hemp is harvested for fiber production when the male plants are in full
flower and are shedding pollen. By harvesting before the male plants die,
the retting of both male and female plants is more uniform, as both types
of plants are still green and growing. The harvesting period may extend
for 2 weeks or longer. Very early harvested hemp may produce a finer and
softer fiber than that harvested later, but it is usually weaker. The
fiber from hemp that has been harvested so late that many seeds have
matured does not possess so good cordage and textile characteristics
as fiber from hemp harvested earlier. Hemp stalks should be relatively
free of leaves except a few at the very top before harvesting. This is
important when hemp is shocked after harvest, as it makes the top of the
shock smaller so that less rain can enter the shock.
[Illustration]
=Machinery=
Harvesting methods vary with locality and climate. In Kentucky, hemp may
grow to a height of 15 feet or more. These long stalks are difficult to
handle with machinery. Self-rake reapers (see below) have been used in
harvesting hemp for many years, and they probably do better work with
very tall hemp than any other machine now available. A modified rice
binder, which cuts and binds the hemp into bundles, is also available,
although difficulty in handling the very tall hemp may be experienced.
This latter type of machine can be used for short hemp in areas, such as
Kentucky, where hemp must be shocked within a few days after harvest to
avoid sunburn.
[Illustration]
In the northern part of the Corn Belt the hemp usually does not grow so
tall and therefore can be handled more easily with machines. During the
first World War hemp-harvesting machinery was developed. These harvesters
(see above) in one operation cut an 8- or 9-foot swath and elevate the
stalks to a quarter-circle platform where they are turned automatically
and dropped or spread on the ground for retting. The butts of the stems
all lie in the same direction and are relatively even. The thickness of
the layer of stalks in the swath influences the speed and uniformity of
the dew retting. Machines of this type, because of their labor economy,
are recommended for use in the Northern States, where hemp can be safely
spread for retting when harvested.
Hemp harvesters are usually owned by the hemp mills. They are rented to
the individual farmers, who usually furnish the motive power and the
labor to run the harvesters.
_Retting_
Retting is the partial rotting of the hemp stalk. It permits the fiber
in the stalk to separate easily in long strands from the woody core. The
fiber strands break if unretted stems are bent or broken.
In this country the usual practice is to ret hemp by allowing it to lie
on the ground, where it is exposed to rain and dew. This method is called
dew retting.
Dew retting is dependent upon dews and rains to furnish the moist
conditions necessary for the growth of the molds that cause the retting.
In warm, moist weather the retting may require 1 to 2 weeks, but usually
4 to 5 weeks is required for retting in Kentucky and Wisconsin. Hemp has
remained spread under snow in Wisconsin until spring without serious
injury, but more often hemp left under snow all winter is overretted and
ruined.
=Underretting and Overretting=
If hemp stalks are lifted from the ground before they are sufficiently
retted, the fiber will not separate easily from the woody hurds (small
pieces of the woody core of the plant) in milling. However, if the
retting is permitted to go too far, the fiber separates very readily
from the core, but the adhesive substance between the individual fiber
cells in the long strand breaks down and the fiber is weak. Hemp further
overretted produces mostly short broken strands of fiber called tow
fiber, which is less valuable than the long parallel strands of fiber
called line fiber.
Nowhere in the growing or processing of hemp is good judgment more needed
than in determining the time to end the ret. Experience and good judgment
are necessary to determine just when the hemp stalks should be lifted
from the field and bundled. The lifting and shocking stops the retting
action. The value of the fiber can be cut in half or entirely lost by
several days' overretting in warm weather.
=Sunburning=
In Kentucky, hemp spread immediately to ret after harvest is apt to
sunburn, or sunscald. It is common belief that the hot, bright days in
August and September in some way cause deterioration of the fiber if
spread for retting. Sunburned fiber is uneven in color, usually has
less strength, and possibly is drier and more harsh than fiber not
sunburned. In order to avoid sunscalding, the hemp is shocked after being
harvested and not spread for retting until the cooler days of November.
In locations having climatic conditions similar to those prevailing in
Wisconsin, sunscald of hemp is rare.
[Illustration]
=Turning Stalks=
In dew retting the spread stalks should be turned once or more during the
retting period. This aids in bleaching the stalks and results in fiber
of more uniform color and quality. The turning is done by workmen using
bent poles approximately 8 to 10 feet in length. The poles are pushed
under the head ends of stalks in the swath, and the stalks are turned
over without moving the butt ends.
[Illustration]
In turning the straw the workmen start in the middle of the field,
turning the first swath into vacant center space. The second swath will
be turned to lie where the first swath had been, and so on.
Care should be exercised in turning to prevent the stalks from tangling.
The more hemp is handled, the more tangled the stalks may become. Tangled
hemp is more difficult to process and produces a high proportion of
tangled, short, tow fiber.
=Testing the End Point of the Ret=
A few days too long in the field may make the difference between retting
and rotting. Therefore, it is most important that inexperienced farmers
obtain the assistance of the hemp-mill superintendent or an experienced
grower in determining when to stop the retting.
Dry hemp stalks should be tested when possible to determine the degree of
retting. Three to six stalks are taken in both hands and bent back and
forth to perform the break test. If properly retted, the fiber should not
break when the woody core breaks. The hurds should fall free of the fiber
in the breaking and shaking between one's hands. If the hemp is only
partly retted, some hurds will adhere to the loosened fiber. Unretted
hemp fiber is usually green or light yellow. Dew-retted hemp is usually
slate gray or black.
After the fiber is broken free, its strength should be tested by
breaking a small strand between the fingers. A small strand of fiber
not twisted and about 3/32 inch wide should break with great difficulty
and with a decided snap. If it is very weak and breaks with little or no
snap the hemp is probably badly overretted or may have been grown under
unfavorable cultural conditions. (See p. 5.)
[Illustration]
All indication that the retting end point is near is that the hemp makes
"bowstrings." In a small percentage of the stems, less than 1 to 5
percent under certain conditions, the middle of the stalks appears to ret
first. The fiber comes free from the middle and forms a string fastened
at the top and bottom of the stem, not unlike a bowstring. If bowstring
stems are found, a sample of the hemp should be taken to the hemp-mill
superintendent as soon as possible for verification of the retting end
point. The bowstring condition is only a supplementary aid in determining
when to stop the retting, and it may or may not occur in properly
dew-retted hemp.
Some experienced hemp producers use the peeling test for determining the
degree of retting. This is accomplished by peeling the fiber away from
the butt ends of the stems. If properly retted, the fiber should peel
freely from the woody core of the stem. If the hemp is not sufficiently
retted, the fiber will break after a few inches have been peeled. This
free-peeling stage is desirable for breaking hemp on hand breaks. Where
hemp is to be processed by machinery the retting need not progress quite
so far as is necessary for hand breaking.
[Illustration]
_Picking Up the Retted Stalks_
Hemp stalks may be picked up by hand. This method has been used from
early times and is satisfactory where labor is plentiful. However, in
this country it is being replaced by machine pick-up binders.
In picking up the straw by hand, small sticks about 3 feet long with a
single steel or wooden hook on the end are used. The hemp is raked into
bunches with these implements, and usually tied. Hemp-fiber bands are
used in tying the bundles. An inexpensive "buck" (see above) may be used
to bunch the hemp, or it may be bunched with a pitchfork.
[Illustration]
The most efficient method is to use the pick-up binder. These machines,
drawn by tractors, cover about an acre an hour. They pick up the retted
hemp stalks and tie them into bundles in one operation. The machines are
part of the modern hemp-mill equipment and are rented to farmers.
Dew-retted hemp is usually shocked after being picked up. The hemp
remains in the shock until it is transported to the mill.
[Illustration]
_Extra Care Insures Extra Profits_
The farmer's job is done when he delivers the hemp to the mill. All
further processing to prepare the fiber is part of the milling operation.
However, it is of interest to both farmers and mill operators to attempt
to keep the hemp stalks and fiber well butted. This means keeping the
butt ends of the stalks or fiber in a bundle all even. Every time the
hemp stalks are handled, care should be taken to see that this is done.
If the hemp stalks are well butted in the bundle when processed, the
milling operations can be carried out more economically. Tangled, uneven
bundles are more difficult and require more time to handle. The yield of
high-value long-life fiber is much greater if the stalks are well butted.
Hemp stalks are considered most desirable if they are less than half
an inch in diameter. The thickness of a pencil is frequently used to
illustrate the size of desirable stalks. The larger diameter stalks have
a lower percentage of fiber than finer stems, are harder to break, and
produce more tow fiber.
Hemp stalks grown on unproductive soil usually contain a lower percentage
of fiber, and this fiber may be coarse, harsh, and of low strength, so
that it breaks into tow in milling.
Stalks underretted frequently must be run through the mill breaker a
second or third time to remove the remaining hurds. This increases the
milling labor costs, and the resultant fiber may be reduced to a low
grade. On the other hand, overretted hemp must be milled as little as
possible, with less pressure exerted on the rollers and a slower speed of
the scutcher wheel to keep from making an excess amount of tow fiber.
_Yields_
Hemp yields have been extremely variable when this crop has been planted
in new areas by inexperienced farmers. In Wisconsin and Kentucky, where
only experienced farmers have grown the crop in recent years, the yields
have not varied a great deal. The crop has been reasonably dependable and
has not often been injured by storms or droughts.
The average yields per acre for experienced farmers are approximately
2-1/4 to 2-1/2 tons of air-dry retted hemp stalks; 850 pounds total
fiber. Under the Wisconsin machine-milling system the yields may average
450 pounds line fiber and 400 pounds tow fiber; under the Kentucky
hand-breaking system they may average 775 pounds Kentucky rough and 75
pounds tow.
If hemp is planted for seed production, the average yields per acre are
approximately 15 bushels or 660 pounds, on bottom land, and 12 bushels on
uplands.
U. S. GOVERNMENT PRINTING OFFICE: 1952
For sale by the Superintendent of Documents,
U. S. Government Printing Office
Washington 25, D. C. -- Price 10 cents
* * * * *
Transcriber Note
Illustrations were moved so as to not split paragraphs. Minor errors were
corrected. The Contents was added for ease of locating sections of interest.
This file was produced from images generously made available by The
Internet Archive.
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