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  1. Crops
  2. Soybeans
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WC 94
2025 Herbicide Guide: Iowa Corn and Soybean Production
The 2025 WC94 provides useful information for the selection of herbicides to be used for weed management in soybeans, corn and pasture grown in Iowa. Herbicide injury symptoms that may occur on crops are described as well as timely discussions about evolved herbicide resistance in Iowa, issues with invasive weeds and the potential for herbicide carryover.
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CROP 1649
Soybean Cyst Nematode-resistant Soybean Varieties for Iowa
Details on selecting and managing soybean cyst nematode-resistant varieties.

Previously known as PM 1649.
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IPM 52
Evaluation of Soybean Varieties Resistant to Soybean Cyst Nematode in Iowa - 2023
Use of resistant soybean varieties is a very effective strategy for managing soybean cyst nematode (SCN). Numerous SCN-resistant soybean varieties are available for Iowa soybean growers. This report provides details by Iowa State University personnel who evaluate varieties each year.
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CROP 3149
Iowa Crop Performance Tests - Soybean 2023
Results of soybean yield trials that are conducted annually by ISU and the Iowa Crop Improvement Association. Provides information farmers need to select the best varieties or brands for their production conditions.

Available from the Iowa Crop Improvement Association.
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IPM 1
Corn and Soybean Field Guide
This 236-page pocket-sized guide (3-3/4" x 6") combines corn and soybean integrated pest management information in one publication for ease of use by corn and soybean farmers, agronomists, and crop scouts.

Newly updated text and images provide the tools for identifying insects, diseases, and disorders of corn and soybean in the Midwest. The guide also contains information on developmental stages, pesticide decisions, and other production-related topics. This publication is constructed of durable, weather-safe materials to withstand regular use in the field.

Looking to purchase multiple copies? The guide is also sold in boxed quantities of 25 at a reduced price ($13/copy).
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$15.00
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$5.00
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IPM 14
Field Crop Insects
Field Crop Insects contains descriptions and images of more than 50 pest and beneficial insects, as well as information on insect life cycle, crop injury, scouting and management options. There is also information on integrated pest management including scouting, degree days, and a defoliation estimation guide. This guide covers corn, soybean, and alfalfa insect pests.

Looking to purchase multiple copies? Field Crop Insects is also sold in boxed quantities of 25 at a reduced price ($6.00/copy).

Previously known as CSI 14. CSI 0014
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IPM 14 BOX
Field Crop Insects (Unit=25)
Field Crop Insects contains descriptions and images of more than 50 pest and beneficial insects, as well as information on insect life cycle, crop injury, scouting and management options. There is also information on integrated pest management including scouting, degree days, and a defoliation estimation guide. This guide covers corn, soybean, and alfalfa insect pests.

Sold as a box of 25 copies ($6.00/copy!)

A digital version of the guide is available; see the single copy listing.

Previously known as CSI 14. CSI 0014
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AEP 302 - 2021
Proceedings of the 32nd Annual Integrated Crop Management Conference
Proceedings from the 32nd Annual Integrated Crop Management Conference held December 1-2, 2021.
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4H 2240
Watch Me Grow
A series of six lessons for crops and horticulture project areas.

  • Lesson One - Seed Dissection
  • Lesson Two - Growing Experience
  • Lesson Three - Rainbow Plates
  • Lesson Four - Identifying Insect Pests
  • Lesson Five - Compost
  • Lesson Six - Produce to Plate

    • Youth-serving organizations in Iowa are encouraged to contact their local Iowa State University Extension and Outreach county office to explore partnership opportunities in administering this program.
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    Lesson Two - PDF
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    Lesson Three - PDF
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    Lesson Four - PDF
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    Lesson Five - PDF
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    Lesson Six - PDF
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    CROP 3197
    2019 Yellow book for soybean aphid
    This publication provides soybean aphid treatment recommendations and application rates, based on research conducted at two northern Iowa research farms in 2019.

    In addition to treatment techniques, the publication also contains information about the soybean aphid life cycle, scouting advice and a statewide summary for 2019.
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    CROP 3157
    Soybean gall midge: a new field crop pest
    Soybean gall midge is a relatively new pest that was first noticed in the Midwest in 2011, and can now be found in parts of Iowa, Minnesota, Nebraska and South Dakota. This publication discusses the characteristics of soybean gall midge, how to spot the pest in soybean fields and how they can be managed.
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    CROP 3155
    2018 Yellow book for soybean aphid
    This publication provides soybean aphid treatment recommendations and application rates, based on research conducted at two northern Iowa research farms in 2018.

    In addition to treatment techniques, the publication also contains information about the soybean aphid life cycle, scouting advice and a statewide summary for 2018.
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    IPM 4
    Soybean Diseases
    This fully revised booklet helps soybean farmers and other professionals in the agriculture industry identify and scout for soybean diseases and provides general recommendations for management. Also included are illustrated disease cycles for many diseases, a foliar disease estimation chart, and soybean growth and development and staging information.

    Looking to purchase multiple copies? Soybean Diseases is also sold in boxed quantities of 50 at a reduced price ($3.50/copy).

    CSI 0004 CSI4
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    IPM 4 BOX
    Soybean Diseases (Unit=50)
    This fully revised booklet helps soybean farmers and other professionals in the agriculture industry identify and scout for soybean diseases and provides general recommendations for management. Also included are illustrated disease cycles for many diseases, a foliar disease estimation chart, and soybean growth and development and staging information.

    Sold as a box of 50 copies ($3.50/copy)

    A digital version of the guide is available; see the single copy listing.

    CSI 0004 CSI4
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    CROP 3147
    2017 Yellow book for soybean aphid
    This publication provides soybean aphid treatment recommendations and application rates, based on research conducted at two northern Iowa research farms in 2017. In addition to treatment techniques, the publication also contains information about the soybean aphid life cycle, scouting advice and a statewide summary for 2017.
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    CROP 3093A
    Soybean Growth and Development - Soybean Staging
    Soybean Staging - Intended to be used as a quick reference handout for soybean staging. It is a supplement to the larger Soybean Growth and Development publication.

    The secured PDF can be downloaded and viewed on your computer or mobile device, but not printed or edited.

    Large quantity discounts (50 copies+) are available. To inquire, please contact us by email (extstore@iastate.edu) or calling (515)294-5247.
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    CROP 3109
    2016 Yellow book for soybean aphid
    This publication provides soybean aphid treatment recommendations and application rates, based on research conducted at two northern Iowa research farms in 2016. In addition to treatment techniques, the publication also contains information about the soybean aphid life cycle, scouting advice and a statewide summary for 2016.
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    CROP 3093B
    Soybean Growth and Development - Key Growth Stages
    Key Growth Stages - Intended to be used as a quick reference for key times in soybean growth and development. It is a supplement to the larger Soybean Growth and Development publication.

    The secured PDF can be downloaded and viewed on your computer or mobile device, but not printed or edited.

    Large quantity discounts (50 copies+) are available. To inquire, please contact us by email (extstore@iastate.edu) or calling (515)294-5247.
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    IPM 79
    Hail on Soybean in Iowa
    This publication shows how to obtain an estimate of the potential yield loss from hail injury to soybean. It describes the methods used to quantify injury on various plant tissue, as well as soybean growth stages, which are an important part of the yield loss estimation process. Additional topics include fungicide use on hail injured crops, replanting severely injured stands, and other information regarding hail on soybean. CSI

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    IPM 77
    A Farmer's Guide to Soybean Diseases
    A Farmer’s Guide to Soybean Diseases provides an overview of the soybean diseases that currently occur in the United States and Canada, with an emphasis on diagnosing diseases in the field. Information for each disease includes symptoms and signs, conditions that favor disease, similar looking diseases and disorders, and a review of basic management options. The book also contains a diagnostic key and disease distribution maps.

    Published by APS Press, A Farmer’s Guide to Soybean Diseases was developed by Iowa State University in partnership with several other universities.

    Reduced from $29.95
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    CROP 3087
    Crop Production Clipboard
    Crop production clipboards provide a handy way to keep key reference information with you in the office helping customers or scouting in corn and soybean fields. Calibration and conversions supplement plant population charts and growth stages of corn and soybeans.
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    CROP 3101
    The Effectiveness of Neonicotinoid Seed Treatments in Soybean
    Beginning in the early 2000s, neonicotinoids were increasingly used as seed treatments for field crops. More than 80 percent of corn and 40 percent of soybean acres nationally are planted with neonicotinoid-treated seed. Published research has shown that while neonicotinoids can be effective in controlling sporadic and inconsistent early-season threats such as wireworms or white grubs, they lose effectiveness well before midsummer, which is usually when the most potentially destructive soybean pest, the soybean aphid, begins to colonize soybean fields across the Midwest. Other publications have also shown that neonicotinoids spread readily through the environment and could pose a threat to beneficial species.

    The publication was a joint effort of Purdue, Iowa State University, Kansas State University, the University of Nebraska-Lincoln, North Dakota State University, Michigan State University, the University of Minnesota, the University of Missouri, Ohio State University, Penn State University, South Dakota State University, Texas A&M University and the University of Wisconsin.

    The PDF is available from Purdue University.
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    IPM 3
    Weed Identification Field Guide 2nd Edition
    The Weed Identification Field Guide, 2nd Edition, is a revised and expanded pocket-sized guide (3-3/4" x 6") for farmers and agronomists to use for weed identification in Iowa corn and soybean fields. The 2nd edition includes four new weed species, many new images, and updated text.

    The 108 page booklet includes tools to aid in accurate weed identification as well as weed lifecycle and herbicide management and stewardship information. It includes over 35 illustrations and more than 250 high-quality photographs of weeds found in Iowa.

    Previously known as CSI 3. CSI 0003
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    PM 1945
    Soybean Growth and Development
    This publication can help soybean producers achieve better yields. It includes photos of soybean vegetative and reproductive stages and updated information about soybean plant growth and management.

    All images from this publication can be purchased by visiting our Digital Media section

    This publication replaced SR 0053 - How a Soybean Plant Develops.
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    CSI 24
    Scouting for Pythium root rot in Soybean
    The Scouting for Pythium  root rot in Soybean card is a 6-page, tri-fold pocket-sized publication (3-3/4" x 6") that outlines the symptoms, scouting, management, and disease cycle of Pythium  root rot in soybean.
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    CSI 23
    Scouting for twospotted spider mites in corn and soybean
     The Scouting for twospotted spider mites in corn and soybean card is a 6-page, tri-fold pocket-sized guide (3¾" x 6") containing scouting information, a description, and images of injury to corn and soybean caused by twospotted spider mites.
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    PM 3038
    Selecting Soybean Varieties
    Selecting the right combination of high yielding genetics and agronomic traits is the first management decision toward a successful soybean crop. This publication provides the reader with several tools that can be used to select high yielding soybean varieties best-suited to Iowa growing conditions.
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    PM 3040
    Planting Soybean for High Yield in Iowa
    Deciding when to plant soybean is an important management decision that greatly impacts yield. This publication discusses the potential yield increases from early planting and potential yield loss from delayed planting.
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    PM 3041
    Understanding Soybean Plant Population Recommendations for Iowa
    Concerns over rapidly escalating seed prices have caused farmers, agronomists, and seed suppliers to revisit soybean planting rates. This publication discusses optimum soybean planting rates in Iowa and surrounding states. This is a must read for those who want to reduce their seed input costs
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    PM 3044
    Staging Soybean Development
    Accurate growth stage determination of soybean is essential to accurately apply pesticides and determine potential yield loss from environmental stress. This handy publication uses high quality images to enable the user to accurately stage soybean development.
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    PM 3045
    Soybean Nutrient Needs
    Maintaining a fertile growing environment is a risk management strategy that produces higher yield and healthier plants that better manage stress. This publication outlines crop nutrient removal rates, foliar fertilization and the influence of soil fertility on plant health.
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    PM 3046
    Soybean Response to Drought
    Drought is a serious but infrequent stressor affecting Iowa soybean production. This publication describes how soybean plant growth and development and nitrogen fixation respond to water deficit conditions. It also discusses simple management practices that have been shown to improve soil water holding capacity.
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    PM 3047
    Recognizing Challenges to Iowa’s Annual Cropping Systems
    Iowa’s soybean and corn cropping systems are among the most productive in the world yet, producing consistently high yields remains uncertain. This publication discusses possible solutions to problems that limit soybean yield in Iowa.
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    PM 1635
    Frost Damage to Corn and Soybeans
    Learn about the characteristics, uses and handling and storage of frost-damaged corn and soybeans.
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    CSI 15
    Speed Scouting for Soybean Aphid
    The Speed Scouting for Soybean Aphid card is a tool for soybean growers to monitor soybean aphid populations in fields using the Speed Scouting technique. The card has both instructions for the Speed Scouting process and a worksheet for recording soybean aphid field observations. Observations are then used to determine if treatment is needed. The Speed Scouting card is a collaborative effort of ISU Extension Specialists and the Iowa Soybean Association.

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    CSI 6
    Early Season Soybean Scouting
    The Early season soybean scouting card is a record keeping tool that outlines diseases, insects, and disorders that occur to seed, seedlings, and young soybean plants from shortly after planting through the V3 stage of vegetative growth.
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    CSI 7
    Mid-season Soybean Scouting
    The Mid-season soybean scouting card is a record keeping tool that outlines diseases, insects, and disorders that occur to soybean plants during the late vegetative through R2 growth stages.
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    CSI 8
    Late Season Soybean Scouting
    The Late season soybean scouting card is a record keeping tool that outlines diseases, insects, and disorders that occur to soybean plants during the R3 (pod fill) through R8 (maturity) growth stages.
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    CRP 22
    Maximizing Profitability on Highly Erodible Land in Iowa | Conservation Reserve Program: Issues and Options
    Options in grass may be the most profitable for CRP land when the long term cost of erosion is considered. Get the details on six income options: CRP, two rotational grazing options, two crop options (rotational corn/soybean), and alfalfa/orchard grass hay.
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    PM 2089D
    Limiting Field Operations - Farm Energy
    Certain field operations are required in modern crop production. But 100 percent fuel savings results when equipment stays parked in the machine shed and a trip across the field is eliminated. Find out how you can start to make a transition to very reduced or no tillage.
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    PM 1636
    Soybean Drying and Storage
    Find out about soybean harvest moisture, storage moisture, drying tips, high-temperature drying, low-temperature drying, and more.
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    PMR 1004
    Soybean Brown Stem Rot
    Learn about symptoms and management practices for soybean brown stem rot, an economically important disease of soybeans in the North Central U.S. This peer-reviewed publication replaces PM 890.
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    IPM 63
    Soybean Cyst Nematode (SCN) Management Recommendations -- Iowa State University Plant and Insect Diagnostic Clinic
    April 2008 revision of soybean cyst nematode management recommendations.
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    PM 2006
    Legume Living Mulches in Corn and Soybean
    These mulches not only provide erosion control, but also fix atmospheric nitrogen. Learn more about five possibilities and their management.
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    PM 1999
    Small Grain Cover Crops for Corn and Soybean
    Learn about species selection, management, and pros and cons of these cover crops.
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    PM 1987
    1% Linolenic Soybean Oil, A Soybean Solution to Trans Fat
    Read about this no-trans-fat soybean oil, an alternative to hydrogenated oils.
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    PM 914
    Phytophthora Root and Stem Rot of Soybean
    Learn about causes, symptoms, resistance, and chemical control of Phytophthora root rot of soybean, a widespread soybean disease in Iowa.
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    PM 1945 Figure 1
    Soybean Maturity Groups
    Description/Suggested Alternate Text:
    Maturity group adaptations where soybean are grown in the United States.

    All digital media is copyrighted by Iowa State University Extension and Outreach. Each purchase includes your acknowledgement and agreement of the Terms and Conditions to use.
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    PM 1945 Figure 2
    Soybean Seedling
    Description/Suggested Alternate Text:
    Soybean seedling with plant anatomy labeled on a V1 soybean plant.

    All digital media is copyrighted by Iowa State University Extension and Outreach. Each purchase includes your acknowledgement and agreement of the Terms and Conditions to use.
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    PM 1945 Figure 3
    Soybean leaf with folded leaflets
    Description/Suggested Alternate Text:
    Soybean leaf with folded leaflets.

    All digital media is copyrighted by Iowa State University Extension and Outreach. Each purchase includes your acknowledgement and agreement of the Terms and Conditions to use.
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    PM 1945 Figure 4
    Soybean germination and emergence
    Description/Suggested Alternate Text:
    Soybean stage progression from planting through emergence and cotyledon stage.

    All digital media is copyrighted by Iowa State University Extension and Outreach. Each purchase includes your acknowledgement and agreement of the Terms and Conditions to use.
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    PM 1945 Figure 5
    VE and VC stages - Soybean
    Description/Suggested Alternate Text:
    Soybean at the VE and VC stages.

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    PM 1945 Figure 6
    V2 plant - Soybean
    Description/Suggested Alternate Text:
    Soybean at the V2 stage.

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    PM 1945 Figure 7
    Soybean roots showing nodules
    Description/Suggested Alternate Text:
    Soybean root showing nodules.

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    PM 1945 Figure 8
    V2 root nodules with sliced nodule - Soybean
    Description/Suggested Alternate Text:
    Soybean at V2 stage showing root nodules including a nodule cross section.

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    PM 1945 Figure 9
    V4 plant - Soybean
    Description/Suggested Alternate Text:
    Soybean at the V4 stage.

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    PM 1945 Figure 10
    V6 plant - Soybean
    Description/Suggested Alternate Text:
    Soybean at the V6 stage.

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    PM 1945 Figure 11
    Soybean development and timing of growth
    Description/Suggested Alternate Text:
    Development and timing of soybean vegetative growth, flowering, pod development, and seed filing.

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    PM 1945 Figure 12
    Soybean flowering on racemes
    Description/Suggested Alternate Text:
    Soybean flowering on racemes.

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    PM 1945 Figure 13
    Fourth node of R3 plant - Soybean
    Description/Suggested Alternate Text:
    Fourth node from the uppermost node of soybean at R3 stage.

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    PM 1945 Figure 14
    R4 plant - Soybean
    Description/Suggested Alternate Text:
    Soybean at the R4 stage.

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    PM 1945 Figure 15
    Dissected young soybean pod
    Description/Suggested Alternate Text:
    Young dissected soybean pod.

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    PM 1945 Figure 16
    Sequence of early pod development
    Description/Suggested Alternate Text:
    Sequence of early pod development.

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    PM 1945 Figure 17
    Floral cluster on stem - Soybean
    Description/Suggested Alternate Text:
    Floral cluster on main stem.

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    PM 1945 Figure 18
    Fourth node pod and bean of R5 plant
    Description/Suggested Alternate Text:
    Dissected pod from the fourth uppermost node of soybean at the R5 stage.

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    PM 1945 Figure 19
    Sequence of pod development through maturity
    Description/Suggested Alternate Text:
    Sequence of soybean pod development, seed filling, and maturity.

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    PM 1945 Figure 20
    Pod and bean of R6 plant
    Description/Suggested Alternate Text:
    Soybean pod and bean development at the R6 stage.

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    PM 1945 Figure 21
    Pods with enclosed beans
    Description/Suggested Alternate Text:
    Soybean pods and enclosed beans from the R6 stage to harvestable beans.

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    PM 1945 Figure 22
    R7 plant - Soybean
    Description/Suggested Alternate Text:
    Soybean plant at the R7 stage.

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    PM 1945 Figure 23
    R7 Stem - Soybean
    Description/Suggested Alternate Text:
    Soybean plant at the R7 stage showing main stem and branches.

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    PM 1945 Figure 24
    R8 plant - Soybean
    Description/Suggested Alternate Text:
    Soybean plant at the R8 stage.

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    PM 1945 Figure 25
    Total plant dry weight - Soybean
    Description/Suggested Alternate Text:
    Soybean accumulation of total plant dry weight by plant component.

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    PM 1945 Figure 26
    Total plant dry weight of MG 2.5 and 3.5 - Soybean
    Description/Suggested Alternate Text:
    Soybean accumulation of total plant dry weight for 2.5 and 3.5 maturity group in Iowa by plant component.

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    PM 1945 Figure 27
    Total plant dry weight early and late May - Soybean
    Description/Suggested Alternate Text:
    Soybean accumulation of total plant dry weight for early and late May planting dates in Iowa by plant component.

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    PM 1945 Figure 28
    Total percent of nitrogen - Soybean
    Description/Suggested Alternate Text:
    Nitrogen uptake accumulation by soybean plant component.

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    PM 1945 Figure 29
    Total percent of potassium - Soybean
    Description/Suggested Alternate Text:
    Potassium uptake accumulation by soybean plant component.

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    PM 1945 Figure 30
    Total percent of calcium - Soybean
    Description/Suggested Alternate Text:
    Calcium uptake accumulation by soybean plant component.

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    PM 1945 Image 31
    Soybean field - Inside cover
    Description/Suggested Alternate Text:
    Ground-level view looking down a row of soybeans.

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    PM 1945 Image 32
    Soybeans in fall
    Description/Suggested Alternate Text:
    Closeup of soybeans in fall, ready for harvest.

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    PM 1945 Image 33
    Green soybean field
    Description/Suggested Alternate Text:
    Early season green soybean field.

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    PM 1945 Image 34
    Soybean pods - Close up
    Description/Suggested Alternate Text:
    Closeup of early green soybean pods.

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    PM 1945 Image 35
    Soybean field with wind turbines
    Description/Suggested Alternate Text:
    Wind turbines adjacent to early season soybean field.

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    PM 1945 Image 36
    Combining soybeans
    Description/Suggested Alternate Text:
    Combining soybean field.

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    PM 1945 Image 37
    Soybeans ready to harvest
    Description/Suggested Alternate Text:
    Soybeans ready to harvest.

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    PM 1945 Image 38
    Soybean pod, ready to harvest - Close up
    Description/Suggested Alternate Text:
    Closeup of soybean pods that are ready for harvest.

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    PM 1881
    Growing Organic Soybeans on Conservation Reserve Program Land
    Organic soybeans may be a very lucrative crop for Iowa farmers. Learn about the market, land preparation, planting and weed management, and the harvest and subsequent crops.
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    PM 1851
    Soybean Replant Decisions
    This full-color publication will help you understand causes of stand reduction, the relationship between yield and plant stand, estimating these stands, and reaching a replant decision.
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    PM 999
    Minimizing Mechanical Damage to Soybeans
    Basic information on why mechanical damage occurs to soybean seed and how to minimize it.
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