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Planning for continuous harvesting of vegetable crops

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Short season crops. Radishes. Kohlrabi. Turnips. Spinach. Arugula ... Weeks into harvest season. 20. 10. 30. Fruit yield distribution. Percentage of total yield ... – PowerPoint PPT presentation

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Title: Planning for continuous harvesting of vegetable crops


1
Planning for continuous harvesting of vegetable
crops
2
Joel Gruver CEFS Student Farm Manager 2000
2001
3
Why do vegetable crops develop at different rates
?
Crop genetics Crop management Weather
4
Phenological time vs. chronological
time
5
Crop genetics
General categories frost hardy vs. frost
sensitive determinate vs. indeterminate immature
vs. mature seeds cut and come again
greens multiple harvest fruits ratoon crops
Specific cultivars
Silver Queen Sugar Buns Jubilee Tuxedo
6
  • Long season crops
  • Leeks
  • Parsnips
  • Pumpkins
  • Brussel sprouts
  • Sweet potatoes

7
  • Short season crops
  • Radishes
  • Kohlrabi
  • Turnips
  • Spinach
  • Arugula

8
Cut and come again greens Kale Lettuce Parsley
Swiss chard Turnip greensCollard Greens Mustard
greens Chicory/Dandelion
9
Multiple harvest fruit crops Summer
Squash Tomatoes Peppers Eggplant Okra
10
Fruit yield distribution
Percentage of total yield
30
20
10
1
5
3
7
Weeks into harvest season
11
Determinate vs. Indeterminate growth
12
Ratoon cropping of sugarcane
Some vegetable crops can be ratooned e.g.
Eggplant, Okra, Peppers
13
Variation between cultivars
http//www.rogersadvantage.com/products/corn_proc.
asp
14
Managing the crop environment Tillage Raised
beds Plasticulture Row covers Natural
microclimates
15
Effect of tillage on soil temperature
http//www.progressivefarm.com/html/figure2.html
16
Effect of raised beds on soil temperature
17
Effect of plastic mulch on soil temperature
http//www.fftc.agnet.org/library/image/eb332f4.ht
ml
18
Effect of row covers on cabbage yield
http//www.fftc.agnet.org/library/image/eb332t4.ht
ml
19
  • Deciding when to plant
  • Look up recommended planting dates
  • http//ipm.ncsu.edu/vegetables/CommercialVegetable
    s/
  • 2) Monitor soil temperature
  • 3) Use backwards planning

20
Recommended planting dates
http//ipm.ncsu.edu/vegetables/CommercialVegetable
s/
21
http//aggie-horticulture.tamu.edu/extension/vegha
ndbook/appendix/table5.html
22
  • Backwards planning
  • Identify harvest goals
  • Plan necessary field activities to achieve
    harvest goals

23
Planning on paper
24
Fine tuning your planning
Heat Unit Accumulation
25
Calculating Heat Units
(Min Temp Max Temp) / 2 - Base Temp
26
Scheduling sweet corn plantings for continuous
harvesting
Second planting
First planting
27
Goal harvest corn each week
2
Rule of thumb Wait until seedlings are 2 tall
before next planting
28
http//aggie-horticulture.tamu.edu/extension/vegha
ndbook/appendix/table9.html
29
Using electronic spreadsheets for planning
30
Identify the weeks when you think that it will be
possible to harvest each crop
31
Plan production activities based on weekly
harvest goals
32
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35
Special Thanks to
Theresa Nartea and all the staff at the Center
for Environmental Farming Systems in Goldsboro, NC
http//www.soil.ncsu.edu/lockers/Gruver_J/
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