Dry Bean Production Guide
A-1133, July 1997
Published in cooperation with Northarvest Bean Growers Association
Introduction
Variety Descriptions
Seed Certification
Dry Bean Type and Development
Planting Rates
Estimation of Yields
Estimates Program
Crop Rotation and Disease Management
Dry Bean Fertility
Weed Control
Relative Herbicide Effectiveness
Weed Seedling Identification
Disease Identification and Management
Fungicides
Non-Parasitic Disorders
Insect Management
Band and Directed Spraying
Irrigation and Water Use
Harvesting Dry Beans
Drying, Storing and Handling
Bean Directory
List of Contributors
U.S. Dry Bean Production
Dry edible bean (Phaseolus vulgaris) is a human food high in protein,
phosphorus, iron, vitamin B1, fiber, with no cholesterol. Dry bean is an
imported staple in many areas of the world, especially Central and South American and
Africa. Different cultures have developed a multitude of end products made with dry edible
bean.
Dry bean is a relatively new crop to the North Dakota-Minnesota region. They have been
grown on a large scale since the 1970s. Two classes of dry bean (navy and pinto) encompass
the major commercial acreage. In addition, black turtle, red kidney, cranberry, pinks, and
small red bean classes are also grown on limited acres. Dry bean are generally grown under
contract with a processing firm. These firms are located throughout the eastern half of
North Dakota and west central Minnesota counties.
The North Dakota Dry Edible Bean Council, the Minnesota Dry Bean Council and the
Northarvest Bean Growers Association are organizations which promote and assist in
marketing of dry bean. The North Dakota Dry Edible Bean Seed Association is organized to
grow and promote dry-bean seed for planting.
Dry bean is a crop that requires special cultural management and attention by the
producer. Proper management is essential from field selection and planting through harvest
and marketing for maximum profitability.
The primary objective of this guide is to help dry bean growers and related industry
personnel to be proficient and successful.
Class and Plant -- Blight -- -- BCMV -- Fusarium White
Cultivar Mat3 Type2 Common Halo Type NY15 Root Rot Mold Rust1
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PINTO
Agassiz E B S — R R — S S
Apache M V — — — — — S R
Arapaho M V S — R R — S S
Aztec E UV S — S S — S S
Bill-Z M V S — R R — S MR
Chase L V R R S S — T R
Elizabeth M V — — — — — S R
Fargo E V — — — — — — S-MS
Fiesta E V S T R R S S S
Focus M UV S — — — — — R
Hatton E V S — R R — S S-MR
Maverick ME V S — S S — — R
Othello E V S T R R — S S
Remington M UV — — — — — — R
RS-101 E USV — — — — — S S
Topaz E V — T R R — S S-MS
Winchester ME UV — — — — — — R
-------------------------------------------------------------------------
NAVY
Agri-1 M B S T R R — S S-MR
Aspen M USV — — R R — — R
Avanti M USV — — R R — — R-MS
Envoy M B — — R R — S R
Fleetwood L B S T R R S S S-MR
Huron M USV — — R R — T R
Mayflower ML USV — T R R T T R
Navigator M USV — — R R — T R
Newport E B — — R R — S R
Norstar ME USV S T R R — T R
Prize M B — — R R — — R
Schooner ML USV — — R R — S R
Seafarer E B S T R R S S S
Snowbunting E B S T R S S S S
Upland ME B S T R S S S S-MR
Vista ML USV — — R R — T R
Voyager ME V — — R R — S S-MS
-------------------------------------------------------------------------
CRANBERRY
Cran-09 M B — — R R S S R
Mich. Imp L V — — — — — S R
Taylor Hort E B — — — — S S R
UI-50 M B — — R R — — —
UI—686 M V — — R R — — R
-------------------------------------------------------------------------
SMALL RED
Cajun E UV — — — — — — MR
Garnet M V — — R R — S S
NW59 ML V S T R R T S S
NW63 ML V S T R R T S S
UI-239 ME V — — — — — S S
-------------------------------------------------------------------------
BLACK
Blackhawk L USV S T R R T T R
Blackjack ML USV — — R R — — R
Black Magic L USV S T R R T T R
Domino L USV S T R R T T R
Midnight L USV S S R R T T R
Panther M USV — — R R — T R
Raven ME — — — R R — S R
Shadow ME USV — — R R — T R
T-39 M USV S T R R T T R
UI-911 M V — — R R — — R
-------------------------------------------------------------------------
PINK
Flamingo E V — — — — — S S
UI537 E V — — R R — S S
Viva M V — — — — R S S
-------------------------------------------------------------------------
LT. RED KIDNEY
California E B S S — — S — S
Early
Chinook M B — T R R — — R
Foxfire ME B T R R R T T R
Sacramento E B S S S S S S S
-------------------------------------------------------------------------
DK. RED KIDNEY
Drake M B S S R R S T R
Isles M B — T R R T T R
Montcalm ML B S T R R S T R
-------------------------------------------------------------------------
GREAT NORTHERN
Alpine M UV S T R R — S R
Beryl M V — — — — — S —
Starlight ME V T T T T — — MR
-------------------------------------------------------------------------
Some cultivar disease reactions adapted from North Central Regional
Extension Publication 198.
1 Reaction based upon field observation of rust obtained in North
Dakota, 1995-1996 and field collections, 1996
S = Susceptible; MS = Moderately Susceptible;
T = Tolerant; MR = Moderately Resistant.
R = Resistant;
2 V = Vine; UV = Upright Vine;
B = Bush; USV = Upright Short Vine.
3 RM = Relative Maturity; E = Early;
M = Medium; ME = Medium Early;
ML = Medium Late; L = Late.
Seed Certification
The purpose of seed certification is to maintain and make available to the public high
quality seed of crop varieties that are produced, conditioned, and distributed as to
insure proper identity and genetic purity. This process of maintaining genetic purity is
done through a nationally recognized seed certification system. Each state has an
authorized agency that establishes minimum standards for genetic purity and other seed
quality factors for each class of certified seed. These minimum standards must meet or
exceed the standards set by the Association of Official Seed Certifying Agencies.
In the case of dry edible beans other seed quality factors like seed borne diseases are
as important as genetic purity. When seed is label as certified, a buyer can be assured
that the seed has been produced and lab tested to maintain varietal purity, low levels of
disease, noxious weeds, inert matter and other crop seeds. Each seed lot is conditioned
and handled as seed and must meet minimum standards for germination. Seed can not be sold
as certified seed until it has passed field inspection and laboratory testing.
All seed sold as certified seed must bear a certified seed tag on the bag. Those tags
will come in three colors. A white tag that represents Foundation class seed, a purple tag
that represents Registered class seed and a blue tag represents Certified class seed.
These are the only color of tags that are recognized by the Association of Official Seed
Certifying Agencies.
The Idaho Department of Agriculture provides a windrow field inspection service to
monitor bean fields for blight symptoms. All seed that passes their windrow inspection is
given a Green tag. No varietal purity check are made during these inspections, nor are
there any laboratory tests for seed borne blight organisms conducted on such seed lots by
the Idaho Ag Department.
Plant Variety Protection PVP
Plant variety protection provides owners of a novel variety control over who can
produce and market the variety that they develop. A Certificate of Plant Variety
Protection can be issued either with a requirement that the variety be certified by an
official certifying agency (Title V option) or the certificate of protection can be issued
which gives the owner of the variety or his designee the exclusive right to produce and
market the variety as seed.
The Title V option — essentially allows anyone to handle the variety
providing it has met all of the certification requirements.
Marketing of protected varieties that don't have the certification requirement is
usually restricted to those that are authorized to handle the variety either through a
licensing agreement or through an established dealer network.
Approximately one-half of the dry bean varieties that have a Certificate of Plant
Variety Protection are protected with the Title V option that requires certification.
Dry Bean Types and Development Stages
Two basic plant types are found in dry edible bean, determinate (bush) or indeterminate
(vining or trailing). Cultivars may be classified according to plant types. For example,
navy beans may be either of the bush or vining type. In the determinate type, stem
elongation ceases when the terminal flower racemes of the main stem or lateral branches
have developed. On indeterminate types, flowering and pod filling will continue
simultaneously or alternately as long as temperature and moisture permits growth to occur.
In addition to the distinction between determinate and indeterminate plant types, four
plant growth habits have been identified. These are: Type I – Determinate bush; Type
II – Upright short vine, narrow plant profile, three to four stems; Type III –
Indeterminate, prostrate vine; Type IV – Indeterminate with strong climbing
tendencies. These growth habits have become useful in identification and classification of
new upright bean cultivars.
Plant development for both determinate and indeterminate plant types has been divided
into vegetative (V) and reproductive (R) stages as indicated in Table 1. Vegetative stages
are determined by counting the number of nodes on the main stem beginning at the
unifoliate leaf node (V1). Reproductive stages are described with pod and seed characters
in addition to nodes. The first pod developing on the plant is described and followed to
full size. At the time of first bloom (R), secondary branching begins in the axis of lower
nodes which will produce secondary groups of blooms or pods. It is important to follow the
main stem, which is readily discernible on both determinate and indeterminate plants. A
node is counted when the edges of the leaflets no longer touch.
Table 1. Stages of vegetative and reproductive development in determinate bush (Type I)
and indeterminate (Type III) dry bean.
General Description* Days from
Stage No. Vegetative stages planting**
---------------------------------------------------------------------
V1 Completely unfolded leaves at the primary 10
(unifoliolate) leaf node.
V2 First node above primary leaf node. Count 19
when leaf edges no longer touch.
V3 Three nodes on the main stem including the 29
primary leaf node. Secondary branching
begins to show from branch of V1.
V(n) n nodes on the main stem, but with blossom A new node
clusters still not visibly opened. each 3 days
V5 Bush (determinate) plants may begin to 50
exhibit blossom and become stage R1.
V8 Vine (indeterminate) plants may begin to 40
exhibit blossom and become stage R1.
------------------------------------------------------------
Determinate BUSH (Type I)
Reproductive Stages
R1 One blossom open at any node. 50
R2 Pods � long at first blossom position. 53
Usually node 2 to 3.
R3 Pods 1 inch long at first blossom position. 56
Secondary branching at all nodes, so plant
is becoming denser but not taller, � bloom.
R4 Pods 3 inches long — seeds not discernible. 59
Bush types may be shorter.
R5 Pods 3-4 inches. Seed discernible. 64
R6 Seeds at least � inch over long axis. 66
R7 Oldest pods have developed seeds. Other parts 72
of plant will have full length pods with
seeds almost as large as first pods. Pods
will be developed over the whole plant.
R8 Leaves yellowing over half of plant very few 90
small pods and these in axils of secondary
branches, small pods may be drying. Point of
maximum production has been reached.
R9 Mature, at least 80% of the pods showing 105
yellow and mostly ripe. Only 40% of leaves
still green color.
------------------------------------------------------------
Indeterminate VINING Plant (Type III)
Reproductive stages
R1 One blossom open at any node. Tendril will 40
begin to slow.
R1 Pods � inch long at first blossom position 43
(node 2 to 5 most plants). Blossom would have
just sluffed.
R3 Pods 1 inch long at first blossom position. 46
Pods are showing at higher nodes when blossom
sluffs, � bloom.
R4 Pods 2 inches long at first blossom position. 50
R5 Pods 3 plus inches long, seeds discernible 56
by feel.
R6 Pods 4.5 inches long with spurs (maximum 60
length). Seeds at least � inch long axis.
R7 Oldest pods have fully developed green seeds. 70
Other parts of plant will have full length
pods with seeds near same size. Pods to the
top and blossom on tendril, nodes 10-13.
R8 Leaves yellowing over half of plant, very few 82
small new pods/blossom developing, small pods
may be drying. Point of maximum production
has been reached.
R9 Mature, at least 80% of the pods showing 94
yellow and mostly ripe. Only 30% of leaves are
still green.
--------------------------------------------------------------------
* Adapted from: Growth stages according to Marshall J. Lebaron
(University of Idaho, College of Agriculture, Current
Information Series No. 228, April 1974).
** Approximate number of days. This will vary from season to
season and variety to variety.
Visual Aid (6KB b&w image)
1. Hypocotyl
2. Radicle
3. Cotyledon (simple leaf)
4. Colydeonary node
5. Tap root
6. Lateral (branch) root
7. First true leaf (unifoliate)
8. Trifoliate leaflet
9. Terminal bud
10. Axillary buds
11. Hypocotyl arch
12. Nodes (point of leaf attachment)
13. Nodules
14. Root hairs
Planting rates vary from 35 to 65 pounds per acre, depending on row spacing, bean plant
type and percent pure live seed. Navy bean range from 2,200 to 2,500 seeds per pound.
Planting rates suggested for navy beans are 35 to 45 pounds per acre of pure live seed.
Studies conducted at various plant populations do not indicate any significant advantage
to having populations greater than 90,000 plants per acre for Type I navy beans. Slightly
higher rates are advised under irrigation.
Pinto beans range from 1,200 to 1,500 seeds per pound. Planting rates suggested for
pintos are 50 to 65 pounds per acre of pure live seed. Populations of 70,000 plants per
acre for Type III (pinto) beans have been found to be adequate. In some instances, reduced
yields were observed when plant populations were below these recommendations. Under
irrigation, some lodging has been observed in the Type I cultivars at extremely low plant
populations.
Rates should be adjusted for low germination or cool, wet planting conditions. To
obtain desired plant populations, overseed live seed by 10 to 15 percent to compensate for
losses during emergence. The normal planting depth is about 1�-2� inches. Seed should
not be planted deeper unless the topsoil is dry. Plant seeds in moist soil if possible.
Windbreaks of corn or sunflower can be planted in fields where winds could become a
problem at harvest. Growers should test their planter on a hard surface and in the field
at normal planting speeds to ensure proper depth and seeding rate.
Dry bean are adapted to a wide variety of soils. They are not sensitive to soil type as
long as it is reasonably fertile, well drained and free of conditions that interfere with
germination and plant emergence, such as saline (salt affected) soils.
Saline soils affect germination, emergence and later plant growth. Plants that emerge
on saline soils may become yellow and have stunted growth. The leaf edges of the affected
plant will be brown and dead and often accumulations of salt may be seen on the leaf
surface (refer to the section on fertility).
Dry bean are a warm season crop and usually are not affected by high temperatures if
adequate soil moisture is present. Cool, humid or rainy weather is unfavorable to dry
bean, but they are adapted to a fairly wide range of temperature. The optimum average
growing temperature for field beans is 65 to 75�F. Dry bean production is more successful
in areas where rainfall is light during the latter part of the growing season. It is
essential that the crop be grown on a well-drained soil since beans are extremely
sensitive to standing water or waterlogged conditions.
Dry bean are not tolerant to frost or to prolonged exposure to near-freezing
temperatures at any stage of plant growth.
The amount of crop damage caused by hail will depend on the intensity, size of hail
stones and duration, as well as plant type and stage of development. Determinate (Type I)
cultivars are likely to suffer greater losses than the indeterminate (Types II and III)
cultivars, because Types II and III can recover and compensate to a greater degree than
can the Type I.
Severe hail damage can delay plant maturity. The earlier the stage of development at
which the injury occurs, the greater the time available for recovery, resulting in less
yield reduction. Hail will not directly affect seed quality unless a strike occurs on the
pod.
-------------------------------------------------------------
NAVY BEANS
-------------------------------------------------------------
Approximate
lbs. Live Seed Plants --------- Row Width -----------
per Acre per Acre Seed spacings within crop row
-------------------------------------------------------------
6" 12" 22" 30"
30 75,000 — — 3.8 2.8
40 100,000 — 5.2 2.9 2.1
50 125,000 8.4 4.2 2.3 1.7
60 150,000 7.0 3.5 1.9 1.4
70 175,000 6.1 3.0 1.7 —
80 200,000 5.2 2.6 1.5 —
-------------------------------------------------------------
PINTO BEANS 12" 22" 30"
-------------------------------------------------------------
50 62,500 8.4 4.6 3.4
60 75,000 7.0 3.8 2.8
70 87,500 6.3 3.3 2.5
80 100,000 5.2 2.9 2.1
-------------------------------------------------------------
You can estimate dry bean yields by knowing the number of seeds per pod, pods per plant
and plants per 1/1000th of an acre. At the time of counting seeds and pods, the maturity
status of each should be determined.
If a seed or pod will not mature, it shouldn't be counted. Then count the total plants
per 1/1000th acre to complete the data collection.
Length of row equal to 1/1000th acre. An accurate estimate of plant population
per acre can be obtained by counting the number of plants in a length of row equal to
1/1000 of an acre. Make at least three counts in separate sections of the field, calculate
the average of these samples, then multiply this number by one thousand (1,000).
Length of Single Row
Row Width to Equal 1/1000 of an acre
-----------------------------------------
(inches) (feet) (inches)
6 87 1
10 52 3
15 34 10
22 23 9
30 17 5
36 14 6
-----------------------------------------
Within a representative and uniform plant stand, randomly select five plants each from
at least five randomly selected locations in the field.
Keeping all plant data separate, pull and count the pods from each plant and then count
the seeds to determine average seeds per pod for all five replications. These data are
combined with the average number of plants per 1/1000th acre.
Average Number of
Seeds per Pound
--------------------------------------
Kidneys 900-1000
Pintos 1400
Great Northerns 1600-1800
Pinks/Small Reds 1600-2000
Navies/Blacks 3000
--------------------------------------
Seeds per pound can vary 10-20% for different varieties within a bean class. If
available, use reported estimates for seed number per pound for your variety.
The accuracy of yield estimate can be improved by counting seeds and pods from at least
10 plants per replication.
Calculations
- (Average seeds per pod) x (average pods per plant) equals average seeds per plant.
- (Average seeds per plant) x (plants per 1/1000th of an acre) x (1000) divided by seeds
per pound of the variety equals yield in pounds per acre.
Dry Edible Beans
Consists of acreage and production reports giving total United States and 17 individual
state estimates. The 17 states are California, Colorado, Idaho, Kansas, Michigan,
Minnesota, Montana, Nebraska, New Mexico, New York, North Dakota, Oregon, Texas, Utah,
Washington, Wisconsin and Wyoming.
Reports on acreage and production are released throughout the year. The following gives
a summary by individual reports. Estimates are total of all classes, unless otherwise
indicated.
- Planting Intentions released end of March each year.
- June Planted Acres released end of June and contains estimates on
acres planted and intended for harvest.
- Planted Acres by Commercial Class are included in the August production
forecast, released around August 12.
- Production Forecasts are made as of August 1 and October 1. Production
forecasts consist of adjusted acres for harvest, yield per acre and total production.
Release dates are around August 12 and October 12.
- Production Estimate by Commercial Class in early December is an estimate
of the current year's planted and harvested acres, yield per acre and production, by
commercial class. The commercial class acreage, yield and production estimate are released
around December 9.
- North Dakota County Estimates contain acres planted, acres harvested,
yield per acre and total production by county. County estimates will be available the
middle of March each year for the previous year's estimates. County data by commercial
class is not available.
Minnesota
Ag Statistics Service
8 East Fourth St., Suite 500
St. Paul, MN 55101
Phone: 612-296-2230 |
North Dakota
Ag Statistics Service
PO Box 3166
Fargo, ND 58108
Phone: 701-239-5306 |
Crop Rotation and Disease Management
Several disease-producing bean pathogens are either soil borne or borne on bean crop
residue. A three year crop rotation helps reduce carryover of most disease pathogens,
including rust, bacterial blights, most root rots and anthracnose. A four year rotation
may be needed if white mold is severe in a field. Crop rotation, although it helps to
reduce disease carryover, is not a "cure-all" since many pathogens can be air
borne and may blow in from nearby fields. This is particularly notable in the case of
white mold and rust.
Some bean pathogens attack only beans; these include the bacterial blights, rust and
anthracnose. Crop rotation reduces populations of these pathogens. Field selection is also
important: if possible, avoid planting next to a field that was severely infected with
rust last year.
Other pathogens, such as the Rhizoctonia root rot pathogen and white mold
(Sclerotinia), attack several crops (hosts), and crop rotation must take into account all
crops that are host of the pathogen. Specific considerations follow.
White mold attacks many broad leaved crops. Dry beans, sunflower and canola are
among the most susceptible. Other crops that are slightly less susceptible include
soybeans, safflower, mustard, lentils, and chickpeas (garbanzo beans). Crops which are
moderately susceptible include alfalfa, field peas, and potatoes. Flax and buckwheat are
only slightly susceptible, and produce very few of the survival structures called
sclerotia. They are less liable to be severely attacked and less liable to help maintain a
white mold population than most other broad leaved crops. Sugarbeets have not been
attacked by white mold in Minnesota or North Dakota. Members of the grass family,
including small grains, corn and millet are immune to white mold and are good rotational
crops for dry bean disease management.
Rhizoctonia causes a root rot of dry beans. The same strains of Rhizoctonia that
attack dry beans also cause a severe root rot of sugarbeets, and can cause a root rot of
soybeans. Including two of these crops in a rotation is likely to lead to the buildup of
Rhizoctonia. One of the Rhizoctonia strains that attack dry beans, sugarbeets and soybeans
also attack flax and lentils.
Dry bean is responsive to fertilizer when soil levels are inadequate to support yield
levels possible with existing soil moisture and growing season climatic conditions. Soil
testing is recommended to determine the probability of crop response to fertilizer
amendments. If soil levels are less than adequate, dry bean may respond to nitrogen (N),
phosphorus (P), potassium (K) and zinc (Zn) in many Northern Plains soils. Soil test cores
should be taken at 0-6 inch and 6-24 inch depths. N is analyzed on both core depths, and
P,K and Zn are analyzed on the 0-6 inch depth. Salt levels on both depths may be analyzed
if there is reason to suspect a salt problem. Soil pH may be determined on the surface
depth if iron chlorosis problems are anticipated.
Phosphorus
Phosphorus should be applied as recommended in Table 1. Soil test levels indicating
medium levels and lower would be expected to respond to P fertilizer. P fertilizer may be
broadcast or banded. Banded rates of P in the very low or low range may be reduced by
one-third from table recommendations since the broadcast recommendations also include
extra buildup fertilizer useful in long-term fertility programs. Reducing the rates will
not result in long-term improvement of soil P fertility but may increase short-term
profitability in the current crop year.
Table 1. Phosphorus recommendations for dry bean.
Soil Test Phosphorus, ppm
--------------------------------
VL L M H VH
Bray Pl 0-5 6-10 11-15 16-20 21+
Olsen 0-3 4-7 8-11 12-15 16+
-----------------------------------------
lb/A -------- lb P2O5/Acre --------
1200 20 15 10 0 0
1400 25 20 15 0 0
1600 30 25 15 0 0
1800 35 25 15 0 0
2000 45 30 20 10 0
2200 50 35 20 10 0
2400 55 40 25 10 0
-----------------------------------------
Banded P should not be placed in contact with the seed. In fact, no fertilizer should
be placed in contact with the seed. The fertilizer band should be placed with at least
1 inch of complete separation from the seed. A band 2 inches to the side and 2 inches
below the seed is very commonly used.
Potassium
Potassium is seldom required in most Northern Plains soils; however, a soil test should
be analyzed to determine the probability of response. Medium K level or lower may respond
to K fertilizer. Lower K levels may sometimes be found on sandy ridges within the region.
The rate of K recommended at different K soil test levels is shown in Table 2. K
fertilizer may be broadcast or banded. Banded K should not be placed with the seed. At
least 1 inch of seed and fertilizer separation is required.
Table 2. Potassium recommendations for dry bean.
Soil Test Potasium, ppm
-------------------------------------
Yield VL L M H VH
Goal 0-40 41-80 81-120 121-160 161+
----------------------------------------------
lb/A ----------- lb K2O/Acre -----------
1200 35 15 0 0 0
1400 35 15 0 0 0
1600 40 15 0 0 0
1800 45 20 0 0 0
2000 50 20 0 0 0
2200 55 25 0 0 0
2400 60 25 0 0 0
----------------------------------------------
Nitrogen
Inoculation
Many legumes have the ability to fix N from the air without the use of commercial
fertilizers if inoculated with a nitrogen-fixing bacteria. The N-fixing bacteria for dry
bean is called Rhizobium phaseoli, and it is specific for dry bean. Inoculant used for
soybean or pea are different and will not infect dry bean. Unfortunately, the relationship
between dry bean and Rhizobium phaseoli is not strong. Dry, hot weather, short periods of
soil water saturation, and cold weather, will all result in sloughing off of nodules, so
it may be difficult to achieve high dry bean yields consistently using inoculation for an
N source.
Dry bean seed is usually inoculated with a chemical used to control bacterial blight.
Until recently, many dry bean producers would not use an inoculation treatment because of
the fear that the chemical would also kill the Rhizobium bacteria. It was recently shown
that at least some newer strains or formulations resisted the seed treatment, and would
produce greater nodule numbers when inoculant was applied to seed immediately prior to
planting. However, higher rates of soil N at planting decreased the number of nodules on
the plant. Therefore, the following guidelines are suggested to determine whether to
inoculate or apply fertilizer N instead.
Inoculate when —
Yields 2,000 lb/acre represent realistic yield goals, and soil nitrate-N levels are 50
lb/acre or less.
Use fertilizer N only when —
Yields greater than 2,000 lb/acre are consistently desired, or when beginning soil
nitrate-N levels are greater than 50 lb/acre.
Commercial N Fertilizer
Because of the inconsistency of inoculation in supplying season long N nutrition, N
fertilizer is often recommended. Table 3 shows the amount of N required for selected yield
levels. The general formula for these recommended levels is:
N recommended = Yield Goal X 0.05 less soil test nitrate-N to 2 ft., previous crop
credit from other legumes in the rotation and a sampling date adjustment if fall sampled
before September 15 of � lb N/day.
Table 3. N recommendations for dry bean.
Soil N plus
Yield Goal Fertilizer N Required
---------------------------------------
lb/A lb/Acre 2'
1200 60
1400 70
1600 80
1800 90
2000 100
2200 110
2400 120
---------------------------------------
Some producers are reluctant to apply fertilizer N because of fear of white mold caused by
enhancing robust early growth. However, studies have indicated that higher susceptibility
to white mold is dependent on increased crop growth from either inoculation or N
fertilizer. If the crop is healthy enough to achieve a high yield level, it is susceptible
to white mold damage if environmental conditions are favorable for the disease, regardless
of source of N. Recently developed upright growth varieties, wider rows and crop rotation
away from white mold susceptible crops may help to reduce white mold infection and damage.
Certainly, being prepared to apply fungicides at the proper time is important in a higher
yield environment.
Zinc
Dry bean is one of only a few crops in the region to regularly respond to zinc
fertilizer in low zinc soils. Soil test levels below 0.8 ppm may respond to fertilizer
zinc application. Zinc deficiency may be seen as bronzing, browning and death of leaf
tissue, stunting, and poor vining. Zinc deficiency may be treated by foliar sprays of zinc
sulfate, zinc chelate or ammoniated zinc solutions. Zinc deficiency may be prevented with
preplant or planter treatments of zinc sulfate, zinc chelates or ammoniated zinc
solutions. A treatment of 3-5 lb/acre actual zinc preplant incorporated as zinc sulfate
may improve soil availability for several years.
[ More ] [ Index ]
A-1133, July 1997
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