Upgrade to remove ads
Agronomy 212L Quiz 2- Corn Growth, Development, and Management
Terms in this set (53)
Protective seed coat
Protective sheath covering the emerging shoot
Embryonic root, first part of seedling to emerge during germination
Appears at physiological maturation, signals the end of dry matter accumulation
Stores oils necessary for germination
Energy reserve for seedling (Contains- carbs, proteins, fats)
What are the two main parts of the seed?
Cotyledon and Endosperm
What are the five stages of germination and what are their functions?
1. Imbibition= Initial absorption of water- activation of metabolism
2. Enzyme Activation= Break down stored tissue, transfer of nutrients, chemical reactions
3. Initiation of Embryo Growth= Compounds are translocated to emerging axis
4. Rupture of the Seed Coat= Cell elongation and division cause the radicle to protrude through seed coat- germination complete
5. Emergence of the Seedling= Begins to establish itself- photosynthesis
What are the parts of the corn plant?
Tassel- male flower (pollen production)
Husk- leafy outer covering of ear
Silk- female flower
Ovules- female reproductive cells
Root Systems- nodal, seminal, radicle
Encloses and protects younger leaves
Producer of photosynthesis
Used for staging purposes
The space between each node
Transport water and nutrients from source to sink
Functional stigma of the corn (female flower)
Contain female reproductive cells
Roots emerging from nodes above the seed
What part of the plant is female?
What part of the plant is male?
What is produced by the male flower?
What must coincide in order for an ear to get pollinated?
Silks must be present
What could happen to silks to prevent them from being pollinated?
No wind, Drought
What is the growing point?
Point of cell division
Where is the growing point located?
Base of the whorl- remains under soil surface until V6
Increase in size of an individual plant or plant component
Plant's progression from earlier to later stages of maturity based on specific criteria
Growth of roots
Formation of corn kernals
How do you vegetatively stage a corn plant?
By counting the number of visible leaf collars.
What is the last vegetative stage before the reproductive stages in the plant's life cycle?
What happens if the bottom leaves have senesced off?
The plant needs to be dug up and the stalk should be opened- count number of nodes
How many reproductive stages are there?
What are the 6 reproductive stages?
R6- Physiological Maturity
When during the growing season should you estimate yield?
Why do we estimate yield?
To reduce and gauge potential stresses- used to make marketing decisions
Which of the critical stages do we have the most control over?
Planting and Emergence
What does GDD stand for?
Growing Degree Days
What is the maximum number of growing degree day's corn accumulates in one day?
What is GDD?
Growth and development of a crop
What is Relative Maturity?
How many days the hybrid's growing season length will be
What is the equation for GDD?
(max temp + min temp) divided by 2.... minus 50
Why is uniform density important in fields?
Reduce different yield potentials; optimize average productivity
What is the optimum planting depth for corn?
When is the optimal planting date for corn in Iowa?
April 20th - May 5th
What are some factors to consider when deciding to replant?
Stage, population, cost, time of year, extent of damage
What is the minimum soil temperature you should begin planting at when planting corn
What are some risks associated with planting in cold conditions?
Seed will not absorb water
What are some risks associated with planting in wet conditions?
Lack of oxygen and crusting
Which nutrients are removed in higher quantities with the grain and which nutrients are left with the residue?
Nitrogen and phosphorus
During what developmental stage does corn require the most water?
What can we do as managers to alleviate stress during that time?
Irrigation systems- provide water
What is Physiological Maturity?
Point of maximum seed dry weight accumulation
What is the ideal moisture percentage for Physiological Maturity, Harvest Moisture and Storage Moisture?
Sets with similar terms
Plant Lab Quiz 5
Reproduction in Flowering Plants
Book 2 Unit 2 Lesson 4 Plant Processes
Exam #5 - topic 4. plant growth and development
Other sets by this creator
Econ 235 Final Exam
Econ 101 Final Exam
AnS 214L Practical (2)
AnS 214L Practical 2