peanut growth & development
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PEANUT GROWTH & DEVELOPMENT
IntroductionIntroductionArachis hypogaea L.
Fabaceae (Legume) family– is in the pea family, is not a nut
Native of South America– center of origin near Bolivia, Uruguay, and Paraguay
Four market types– Virginia (VA, NC, SC)– Runner (GA, AL, FL, MS)– Spanish (TX, OK)– Valencia (NM)
Two subspecies• hypogaea
– Do not flower on main stem
– Mature later
– Have higher water requirement
– Alternate branching pattern
– Larger seed
• fastigiata– Produce flowers on main stem
– Have sequential branching
– Mature earlier
– Lower water requirement
– Smaller seed
PEANUT MARKET TYPES
Runner (hypogaea subspecies)– grown primarily in Southeast
Virginia (hypogaea subspecies)– grown primarily in Virginia and North Carolina
Spanish (fastigiata subspecies)– grown primarily in Texas and Oklahoma
Valencia (fastigiata subspecies)– grown in primarily in New Mexico
Planted Acres of Selected U.S. Crops
Crops 2005 2006
Corn 81,759,000 78,561,000
Soybean 72,032,000 75,565,000
Wheat 57,229,000 57,344,000
Cotton 14,245,400 15,281,000
Sunflower 2,709,000 1,984,000
Peanut 1,657,000 1,242,000
Source: USDA – National Agricultural Statistics Service
Planted Acres2005 2006
Georgia 755,000 580,000
Texas 265,000 155,000
Alabama 225,000 160,000
Florida 160,000 130,000
North Carolina 97,000 85,000
South Carolina 63,000 60,000
Oklahoma 35,000 23,000
Virginia 23,000 17,000
New Mexico 19,000 16,000
Mississippi 15,000 16,000
USA total 1,657,000 1,242,000
PEANUT SEED
Made up of two
cotyledons & embryo
Embryo– plumule
– hypocotyl
– primary root
Planting Depth – 2.5”
1.5” of Moisture
Place Seed into Good Moisture
At germination and emergence, the hypocotyl and primary root are known collectively asthe radicle.
Peanut plants are in a vegetative growth stage forthe first 35 - 40 days after planting.
The peanut plant is very deep rooted.Roots can be found several feet deep.
Nitrogen fixing nodules on peanut root – This is NOT nematode damage!
A peanut leaf is made up of four leaflets.
Peanut plants will begin to “lap” about mid season providing complete canopy coverage
About 35 days after planting, the peanut plantbegins its reproductive stage with the onset ofblooms.
The peanut flower is a perfect flower, with bothmale and female parts present in the sameflower.
At the base of the peanut flower are theovaries.
Pollen grains shed inthe petals and attach tothe stigma. The firstpollen grains thatmature and travel downthe pollen tube, fertilize the ovaries.
a• The fertilized
ovary is referred to as a peg.
• The peg grows toward the soil surface and pushes 1 to 3 “ into the soil.
• The tip of the peg takes in water and nutrients, and swells to become the peanut pod.
Pegs entering the soil
Peanut blooms
Peanut pegs and pods below ground
Reproductive Growth Stages of PeanutGrowth stages of peanutK. J. Boote, Peanut Science 9:35-40
Beginning podBeginning peg
R2 R3R1
Beginning bloom
R4
R7
R5 R6
Beginning seed
Beginning maturity
Full pod Full seed
Heat or pests can damage pegs
The basal kernel developsfirst and faster than theapical kernel.
Basal kernel
Apical kernel
Cross section of peanut podat maturity. The embryo isvisible.
Affect of Seed Calcium on Percent Germination of Peanut Seed
40
50
60
70
80
90
100
100 200 300 400 500 600 700
Seed Ca, ppm
Ger
min
atio
n %
Source: D.L. Hartzog and J.F. Adams, Auburn University
Y = -43.6 + 0.668x – 8.06 x 10-4x2
Plateau = 95%R2 = 0.68
Irrigated Peanut Acres in Georgia*Irrigated Peanut Acres in Georgia*
0
100,000
200,000
300,000
400,000
500,000
600,000
700,000
1970 1975 1977 1980 1986 1989 1992 1995 1998 2000 2004
Irrigated Acres Planted Acres
*Based on survey by UGA Biological and Agricultural Engineering Department
7
17
51
56 54 54
53 58 58
36
56
Weekly Water Use by PeanutWeekly Water Use by Peanut
0.070.10.2
0.30.35
0.6
0.80.9
1.1
1.5
1.751.9
22.1
21.9
1.75
1.25
1
0.8
0
0.5
1
1.5
2
2.5
4 8 12 16 20
Weeks After Planting
Inches
Peak ET = .30 inches/day
Plant PeanutsMay 1
BloomInitiation
13 weeksJune - AugustTotal Water = 18.85
Irrigation Management
Critical water stage is 40 –110 DAP
DO NOT allow stress in last 30 days
Use scheduling system, i.e., Irrigator Pro
The seed is attached to the inner hull layer by the funiculus.The funiculus functions as an umbilical cord, transportingwater and nutrients to the kernel.
University of GeorgiaUniversity of Georgia
PEANUTPEANUT
Research and ExtensionResearch and Extension
PEANUTPEANUT
Maturity DeterminationAnd Harvest
Maturity DeterminationAnd Harvest
PEANUT HARVESTPEANUT HARVEST
The Good Ol’ Days???
Factors Affecting Peanut Maturity
Weather Too hot – hastens Too cool – slows Too cold – shuts down
Pest pressure Diseases – defoliation by leaf
spot, weakened vines, weak peg stems
Insects – defoliation by foliage feeders, chew peg stems
Fertility N def Mn def
Hull-Scrape Maturity Profile
Based on color change of mesocarp
Exocarp can be removed by knife or pod blaster
Color change goes from lighter (immature) to darker (mature): white, light yellow, dark yellow, orange, brown, black
Hull Scrape Maturity Profile
Peanut Wet Pod Blaster
Improper Digging Causes Yield Loss
Peanut Digger-Shaker-Inverter
Peanut Digger-Shaker-Inverter
Properly Dug and Inverted
Pods should be up off the ground
Allow about 3 days for windrow curing
DO NOT dig just ahead of rain event
Ideal conditions for curing include: low humidity, clear days, slight breezes
Combining“Pickin’ Peanuts”
Farmers Stock Peanut Transportation &
Handling
Post Harvest Practices to Reduce Risk of Aflatoxin in Farmer Stock
Peanuts
Level peanuts in trailer Dry to 10% moisture or less immediately following harvest
Follow proper curing and storage recommendationsMaintain safe moisture levels during and handling and storage
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