Greenhouse Management
Chapter 3
Objective 1.1Explain why the nursery industry is one of the most advanced sectors of agriculture
n Growers must be expecting in all of the following areas:
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n Watering and fertilizing
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n Harvesting
n Storage
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n Legal issues and employee management
Objective 1.2Explain why growers often use artificial lighting.
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Objective 1.3Explain why it is important to properly maintain the heating and ventilation systems.
n The heating and ventilation system ______and provides the ______.
n Two diseases include:
n Botrytis
n Mildew
Objective 1.4List and explain the various skills a grower must have in the greenhouse industry.
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n Watering, temperature, fertilizing, pest management and lighting.
n Mechanical skills
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n Selling, advertising and maintaining quality of crop after it is harvested.
n Administrative
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n Laws
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Objective 1.5List and explain the various types of growers.
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Duties:
n In charge of all phases of propagation (production)
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n Lighting
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n Pest management
n Grower: ______
n Lead grower: ______.
n ______: carries out the orders of the owner and oversees the work of the head grower, growers and assistants.
n Production manager: ______. They order all of the plant materials, supplies, and fertilizers.
Grader:
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n Shipping of plants and flowers
n They also order the cartons, containers and packaging materials.
Manager:
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n And packers
Objective 1.6Explain what type of care should be given to cut flowers
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Objective 1.7Identify the section of the nursery industry that is highly mechanized.
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Objective 6.1Identify the cost associated with greenhouse production
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Objective 6.2Explain the greenhouse effect
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n This results in a ______.
Objective 6.3Identify the types of fuels for heating a greenhouse
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n Coal
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n Wood
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Objective 6.4Define BTU
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n One BTU is the quantity of heat required to ______.
Objective 6.5Identify the types of hot water heating systems
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n Uses steam to flow throughout the system.
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n As it cools, it condenses and returns to the boiler located at the bottom of the system.
n Motorized Accelerated Systems
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Objective 6.6Explain the types of heat distribution in a greenhouse
n Natural Convection
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n Forced Convection
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Objective 6.7Demonstrate how to calculate surface area of a greenhouse
n Walls
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n Gable Ends
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n Roof
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n Step 1
n Calculate the surface area for one of the ______.
n ______since the wall on the opposite side is the same size.
n Step 2
n Calculate the surface area for the ______.
n ______since the wall on the opposite side is the same size.
n Step 3
n
n ______since the opposite end is the same size.
n Step 4
n Determine the width of the ______.
n ______and multiple by the length of the greenhouse.
n Multiple your answer by two since the roof on the opposite side is the same size.
n Step 5
n
Objective 6.8Calculate BTU requirements for a greenhouse
n BTU= H
n
n K=
n a=
n t1=
n t2= ______. (Expected low)
n ______to your final answer.
n This is due to loss of heat caused by ______.
n BTU requirements = 1000
n 1000 x 10%= 100
n 1000 + 100= 1,100 BTU’s
Objective 6.9Calculate the amount of pipe needed to heat a greenhouse
n Finned Pipe
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n
Objective 6.10Explain how boilers are rated
n 1 Boiler Horsepower =
Objective 6.11Explain the function of greenhouse ventilation
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•
• To reduce ______to ______
Objective 6.11aIdentify the diseases are caused by high humidity in the greenhouse
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Objective 6.12Calculate the size of fan needed to ventilate a greenhouse
n Step 1
n
n
n W = ______of the greenhouse
n He = ______of the side wall
n Hr =
n L = ______of the greenhouse
n Step 2
n Divide the volume ______.
n cfm’s = ______
Objective 6.12Identify the various types of cooling systems
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n High-Pressure
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Objective 6.13Calculate the size of cool cell needed for a particular greenhouse
n Step 1
______* = Square Feet of Pad
______cubic feet
* Use the formula for calculating volume of a greenhouse.
n Step 2
Apply Correction Factor for Fan-to-Pad Distance ______.
Distance in Feet Correction
20-30 1.7
30-45 1.56
45-60 1.42
60-85 1.28
85-100 1.14
Example Correction
n Volume =
n Distance =
n Pad Size =
n Correction Factor =
n Final Size After Distance Correction =
______* ______= ______ft2
n Step 3
Apply correction for ______.
Elevation Correction
to 1000 ft 1.0
1000-2000 ft 1.04
2000-3000 ft 1.08
3000-4000 ft 1.12
4000-5000 ft 1.17
5000-6000 ft 1.22
6000-7000 ft 1.27
Example Correction
n Volume = ______ft3
n Distance =
n Elevation =
n Pad Size =
n Correction Factor = 1.42
n Final Size After Distance Correction =
______
n Elevation Correction =
______ft2 * ______= ______ft2