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Initiation of vegetative and reproductive structures (chart)
Periods of initiation and growth for individual above-ground plant structures from planting to R6.

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Close-up of a collared leaf with "line" on the back side
Collared leaves typically have a "line" on the back side that is distinguishable

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Close-up of collared leaves at leaf opening
Collared leaves have slightly pale tissue at the point where the leaf opens away from the stalk

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Lower stalk split and nodes distinguishable
Corn plant split lengthwise through the root system with nodes 1 through 8 visible

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Rate of vegetative development from emergence to final leaf (graphic)
Prediction of vegetative development based on growing degree day accumulation

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Rate of reproductive development from R1 to R6 (graphic)
Prediction of reproductive development based on growing degree day accumulation

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Impact of seeding depth on plant's root formation
Seminal and nodal root development of V2 plants at seeding depths ranging from 0.5 to 2.5 inches deep

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Lower stalk split with roots and nodes distinguishable
Plant dissected lengthwise through the nodal root system with roots originating from specific stalk nodes

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Close-up of lower stalk and brace roots
Brace root development at stalk nodes 6, 7, and 8

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Mature kernel with different components distinguishable
Whole and cross-sectioned kernels with pericarp, embryo, and endosperm.

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Germinating seed
Four seeds showing the process of germination and changes in the radicle and coleoptile in timeline progression

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Emerged (VE) plant
Plant at emergence with radicle, seminal roots, mesocotyl, and coleoptile.

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Plant development from planting to V2
Seed and plant growth from planting to V2 in timeline progression.

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V1 plant
Plant with one leaf collared; roots also shown.

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V2 plant
Plant with two leaves collared; roots also shown.

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V3 plant
Plant with three leaves collared; roots also shown.

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Dissected V3 plant
Plant completely dissected showing all visible leaves, stalk, and root system.

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V6 plant
Plant with six leaves collared; roots also shown.

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Dissected V6 plant
Plant completely dissected showing all visible leaves, stalk, ear shoots, and root system.

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Tassel from a V7 plant
The tassel and upper portion of the stalk from a V7 plant

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V9 plant
Plant with nine leaves collared; roots also shown

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Dissected V9 plant
Plant completely dissected showing all visible leaves, stalk, ear shoots, and root system

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Tassel from a V9 plant
The tassel and upper portion of the stalk from a V9 plant

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Ear shoots from a V9 plant
Ear shoots from stalk nodes 6 to 13 arranged in progression

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V12 plant
Plant with twelve leaves collared; roots also shown

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Dissected V12 plant
Plant completely dissected showing all visible leaves, stalk, ear shoots, and root system

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Tassel from a V12 plant
The tassel and upper portion of the stalk from a V12 plant

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Ear shoots from a V12 plant
Ear shoots from stalk nodes 7 to 14 arranged in progression

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V15 plant
Plant with fifteen leaves collared; roots also shown

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Dissected V15 plant
Plant completely dissected showing all visible leaves, stalk, ear shoots, and root system

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Tassel from a V15 plant
The tassel and upper portion of the stalk from a V15 plant

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Ear shoots from a V15 plant
Ear shoots from stalk nodes 6 to 13 arranged in progression

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Ears from a V15 plant
Three uppermost ears from stalk nodes 11, 12, and 13

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V18 plant
Plant with eighteen leaves collared; roots also shown

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Dissected V18 plant
Plant completely dissected showing all visible leaves, stalk, ear shoots, and root system

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Tassel from a V18 plant
The tassel and uppermost stalk node from a V18 plant

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Ear shoots from a V18 plant
Ear shoots from stalk nodes 8 to 13 arranged in progression

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Ears with silks from a V18 plant
Three uppermost ears from stalk nodes 11, 12, and 13

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Ears without silks from a V18 plant
Three uppermost ears from stalk nodes 11, 12, and 13; silks have been removed

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Tassel from a VT plant
The tassel and uppermost stalk node from a VT plant

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Tassel development timeline from V7 to VT
Tassels from V7 to VT plants arranged in timeline progression showing the change in appearance that occurs

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Tassel at VT before pollen shed has begun
Close-up of tassel prior to pollen shed; tassel is angled

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Tassel at VT after pollen shed has begun
Close-up of tassel during pollen shed with anthers exserted; tassel is angled

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Close-up of the tassel main stem
Close-up of the main stem during pollen shed with the anthers exserted

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Whole-season plant development timeline
Plants spanning V2 to R6 arranged in timeline progression showing the change in appearance that occurs

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Whole kernel development timeline
Whole kernels from R1 to R6 arranged in timeline progression showing the change in appearance that occurs

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Timeline of longitudinal cross-section of kernels
Cross-section of kernels from R1 to R6 arranged in a timeline showing the change in appearance that occurs

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Timeline of planar cross-section of kernels
Cross-section of kernels from R1 to R6 arranged in a timeline showing the change in appearance that occurs

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Timeline of ear cross-section
Ears split in half to show cob and kernel development from R1 to R6; arranged in timeline progression

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Ear with and without husk leaves from an R1 plant
Primary ear shown twice: first, with husk leaves and silks and second, without

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R1 plant
Plant with uppermost ear silking and all leaves collared; roots also shown

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Dissected R1 plant
Plant completely dissected showing all visible leaves, stalk, ear shoots, and root system

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Kernels from an R1 plant
Three kernel views including whole and cross-sections

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Ear shoots from an R1 plant
Three uppermost ear shoots from an R1 plant; shows difference in size between the primary ear shoot and lower shoots

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Ears with silks from an R1 plant
Three uppermost ears with silks

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Ears without silks from an R1 plant
Three uppermost ears with silks removed

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Kernels from an R2 plant
Three kernel views including whole and cross-sections

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Ear cross-section from an R2 plant
Ear cross-section with glumes visible around each kernel

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Ear with and without husk leaves from an R2 plant
Primary ear shown twice: first, with husk leaves and silks and second, without

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Ear shoots from an R2 plant
Three uppermost ear shoots arranged to show the difference in size between the primary ear shoot and lower shoots

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Ears with silks from an R2 plant
Three uppermost ears with silks; primary ear larger than lower ears

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Ears without silks from an R2 plant
Three uppermost ears with silks removed; primary ear is larger than lower ears

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Kernels from an R3 plant
Three kernel views including whole and cross-sections

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Ear with and without husk leaves from an R3 plant
Primary ear shown twice: first, with husk leaves and silks and second, without

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Ear shoots from an R3 plant
Three uppermost ear shoots arranged to show the difference in size between the primary ear shoot and lower shoots

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Ears with silks from an R3 plant
Three uppermost ears with silks; primary ear larger than lower ears

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Ears without silks from an R3 plant
Three uppermost ears with silks removed; primary ear is larger than lower ears

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Kernels from an R4 plant
Four kernel views including whole and cross-sections

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Ear with and without husk leaves from an R4 plant
Primary ear shown twice: first, with husk leaves and silks and second, without

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Ear shoots from an R4 plant
Three uppermost ear shoots arranged to show the difference in size between the primary ear shoot and lower shoots

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Ears with silks from an R4 plant
Three uppermost ears with silks; primary ear larger than lower ears

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Ears without silks from an R4 plant
Three uppermost ears with silks removed; primary ear is larger than lower ears

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Kernels from an R5 plant
Four kernel views including whole and cross-sections

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Ear with and without husk leaves from an R5 plant
Primary ear shown twice: first, with husk leaves and silks and second, without

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Ear shoots from an R5 plant
Three uppermost ear shoots arranged to show the difference in size between the primary ear shoot and lower shoots

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Ears with silks from an R5 plant
Three uppermost ears with silks; primary ear larger than lower ears

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Ears without silks from an R5 plant
Three uppermost ears with silks removed; primary ear is larger than lower ears

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Kernels from an R6 plant
Four kernel views including whole and cross-sections

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R6 plant
Plant with uppermost ear mature and leaves browning; roots also shown

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Ear with and without husk leaves from an R6 plant
Primary ear shown twice: first, with husk leaves and silks and second, without

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Image(72dpi)
$11.20
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$32.00
Ear shoots from an R6 plant
Three uppermost ear shoots arranged to show the difference in size between the primary ear shoot and lower shoots

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$16.00
Ears with silks from an R6 plant
Three uppermost ears with silks; primary ear larger than lower ears

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Ears without silks from an R6 plant
Three uppermost ears with silks removed; primary ear is larger than lower ears

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Dry matter of individual components (graphic)
Dry matter of five above-ground components shown from VE to R6

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Cumulative dry matter (graphic)
Total dry matter for the whole plant shown from VE to R6

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Nitrogen content of individual components (graphic)
Nitrogen accumulation of five above-ground components shown from VE to R6

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Cumulative nitrogen (graphic)
Total nitrogen accumulation for the whole plant shown from VE to R6

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Phosphorus content of individual components (graphic)
Phosphorus accumulation of five above-ground components shown from VE to R6

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Cumulative phosphorus (graphic)
Total phosphorus accumulation for the whole plant shown from VE to R6

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Potassium content of individual components (graphic)
Potassium accumulation of five above-ground components shown from VE to R6

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Cumulative potassium (graphic)
Total potassium accumulation for the whole plant shown from VE to R6

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Emerged seedling in a field setting
Plant emerged through the soil in an Iowa corn field

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Field photograph of corn early-season (no sky showing)
Iowa corn field with plants in a typical row width and plant density

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Upper plant canopy of a corn field
Upper portion of plants in an Iowa corn field

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Field photograph of young corn (with sky)
Iowa corn field with plants in a typical row width and plant density

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Corn vegetative and reproductive development stages (table)
Official and common names for each developmental stage shown in Table form

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Development staging and plant height conversion (table)
The Leaf Collar Method compared with two other staging methods as well as plant height

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Progression of grain moisture and dry matter during R5 (table)
Progression of kernel milk line during R5 with approximate grain moisture, dry matter, growing degree days, and days necessary

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Field photograph of corn mid-season (with sky)
Iowa corn field with plants in a typical row width and plant density

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Silking ear in field
Field shot of a silking ear with sunlight on the silks

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Rolling Iowa corn field (with sky)
Iowa corn field with plants in a typical row width and plant density

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Corn Growth and Development | Digital Media collection - 101 Images, Charts and Figures | 300 dpi
The Corn Growth and Development digital media collection contains all 101 images from the publicaiton. All photos, charts, and diagrams display ©Iowa State University Extension and are free of labels and watermarks.

Corn Growth and Development is an updated and expanded publication and includes whole plant photography, detailed descriptions of vegetative and reproductive development, and dry matter and nutrient accumulation figures.

Corn Growth and Development replaces the long-standing publication, How A Corn Plant Develops (SR 0048). 

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Zip file - 101 images (300dpi)
$2,652.00
Corn Growth and Development | Digital Media collection - 101 Images, Charts and Figures | 72 dpi
The Corn Growth and Development digital media collection contains all 101 images from the publicaiton. All photos, charts, and diagrams display ©Iowa State University Extension and are free of labels and watermarks.

Corn Growth and Development is an updated and expanded publication and includes whole plant photography, detailed descriptions of vegetative and reproductive development, and dry matter and nutrient accumulation figures.

Corn Growth and Development replaces the long-standing publication, How A Corn Plant Develops (SR 0048). 

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$928.20
Getting Organized -- Personal and Financial Records
Can you find key information when you need it?

Would someone else be able to find essential information if you were away or ill?

Learn how to keep tabs on the many parts of your personal and financial matters with the forms presented in this electronic 65-page workbook. Download/ print the workbook and record essential financial and family information, lists of financial accounts, insurance policies and credit cards; names of professional advisers; health and employment records; location of important documents; and more...
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PDF
$3.00
Staff only version
$0.00
Heartland Family Child Care Handbook
This book, previously called the Iowa Family Child Care Handbook, has been updated. It includes expanded information on toys, books, equipment, and how to organize your home and your day for family child care. Business, nutrition, health and safety, and child development info also included.
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PDF
$10.00
Manual Heartland para el Cuidado Familiar de Ninos
This book, previously called the Iowa Family Child Care Handbook, has been updated. It includes expanded information on toys, books, equipment, and how to organize your home and your day for family child care. Business, nutrition, health and safety, and child development info also included.
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PDF
$10.00
Soybean Maturity Groups
Maturity group adaptations where soybean are grown in the United States.

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Soybean Seedling
Soybean Seedling with plant anatomy labeled on a V1 soybean plant.

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Soybean leaf with folded leaflets
Soybean leaf with folded leaflets.

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Soybean germination and emergence
Soybean stage progression from planting through emergence and cotyledon stage.

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VE and VC stages - Soybean
Soybean at the VE and VC stages.

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V2 plant - Soybean
Soybean at the V2 stage.

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Soybean roots showing nodules
Soybean root showing nodules.

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V2 root nodules with sliced nodule - Soybean
Soybean at V2 stage showing root nodules including a nodule cross section.

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V4 plant - Soybean
Soybean at the V4 stage.

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V6 plant - Soybean
Soybean at the V6 stage.

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Soybean development and timing of growth
Development and timing of soybean vegetative growth, flowering, pod development, and seed filing.

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Soybean flowering on racemes
Soybean flowering on racemes.

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Fourth node of R3 plant - Soybean
Fourth node from the uppermost node of soybean at R3 stage.

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R4 plant - Soybean
Soybean at the R4 stage.

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Dissected young soybean pod
Young dissected soybean pod.

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Sequence of early pod development
Sequence of early pod development.

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Floral cluster on stem - Soybean
Floral cluster on main stem.

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Fourth node pod and bean of R5 plant
Dissected pod from the fourth uppermost node of soybean at the R5 stage.

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Sequence of pod development through maturity
Sequence of soybean pod development, seed filling, and maturity.

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Pod and bean of R6 plant
Soybean pod and bean development at the R6 stage.

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Pods with enclosed beans
Soybean pods and enclosed beans from the R6 stage to harvestable beans.

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