Greenhouse Functions and Controls Horticulture II.

Slides:



Advertisements
Similar presentations
Functions of a Greenhouse Competencies
Advertisements

HEAT.
Starter – From what you know, how does a greenhouse work?
High Tunnel Fruit and Vegetable Production
IGCSE ICT Control Systems.
Horticulture Science Lesson 43 Controlling the Greenhouse Climate
Investigating the Temperature of Air
UNDERSTANDING WEATHER. The Water cycle The amount of water vapor in the air is called humidity. As water evaporates and becomes air vapor, the humidity.
Environmental Requirements for Plant Growth Unit 4 Introductory Horticulture.
Chris Dalrymple. In the colder months, the requirements of orchids change Lower temperature Less light intensity Shorter days Less evapouration Slower.
Weather Reviewing the Big Ideas. Q: What affects the amount of water vapor the air can hold? A: The temperature of the air! –Warm air can hold more water.
Chapter 6 part 2 Passive Solar Space Heating
Greenhouse Effect. The Greenhouse Greenhouses are used to grow plants, especially in the winter. The glass panels of the greenhouse let in light but keep.
Jennifer Currier & Cassie Burnett GLCE: E.ES Identify the sun as the most important source of heat which warms the land, air, and water of the Earth.
1 GREENHOUS MANAGEMENT GREENHOUSE STRUCTURES HEATING, COOLING, AND LIGHTING SYSTEMS.
Growing Houseplants.
Global Warming Layal Al-Meslemani. What is Global Warming? Global Warming is basically when the temperature rises (heats up). This happens when greenhouse.
Humidity & watering. Requirements of Plants A very humid atmosphere reduces the rate of transpiration and evaporation to a level that may be harmful to.
 Controlling the Greenhouse Climate Mr. Fredrickson.
Lesson 2 Controlling the Greenhouse Climate. Next Generation Science/Common Core Standards Addressed! zHS ‐ LS2 ‐ 3. Construct and revise an explanation.
3. Cooling a. Introduction 1) Definition reduce temperature of air entering greenhouse Why? –Reduce stress –Uniformity –Better growth.
Climate. Climate is the year round weather in an area Climactic variables –First and last frost dates –Average winter and summer temperatures –Precipitation.
Functions of a Greenhouse Horticulture II:
Greenhouse Functions & Maintenance Horticulture II:
Sustainable Home and Lifestyle
Climate change and global warming Aiming Wu Department of Earth and Ocean Sciences University of British Columbia Vancouver, BC, Canada December 2004.
Contributed by: Integrated Teaching and Learning Program, College of Engineering, University of Colorado at Boulder.
Greenhouse and Other Structures
 Exposure to air  Moisture (water)  Temperature  Salt  Soil  Light.
Net-Zero Energy Classroom! Lets Design a….  Active Solar – PV (Photovoltaic) Panels convert sunlight into electricity.  Wind Power – When the wind blows,
For the Instructor Upon completion, students will be able to: G3.4 Understand the factors that influence plant growth, including water, nutrients, light,
Growing Greenhouse Crops. What Type of Plants Can One Grow in a Greenhouse? Trees? Shrubs? Bulbs Herbacious? Perenials? Annuals Grass? Food? Cut flowers?
200 pt 300 pt 400 pt 500 pt 100 pt 200 pt 300 pt 400 pt 500 pt 100 pt 200pt 300 pt 400 pt 500 pt 100 pt 200 pt 300 pt 400 pt 500 pt 100 pt 200 pt 300 pt.
LESSON ONE: INTRODUCTION TO HIGH TUNNELS High Tunnel Fruit and Vegetable Production.
Greenhouse Management
com/watch?v=edH488k5R ng com/watch?v=edH488k5R ng.
What are nonliving parts of ecosystems?
Greenhouse Management and Crops
Plant Production. Conditions for plant growth All plants need water, nutrients & oxygen to grow Normally plants can spread their roots to take these in.
When Do I Turn On the Fans... And For How LONG??? Carol Jones, PhD. Stored Product Engineering Biosystems and Ag. Engr. Dept.
Why and how the following weather elements are important and influence the growth and development of crop plants and yield? a. Rainfall b. Relative Humidity.
Environmental Control Systems Evolution, Current Systems, the Future Click on images to go to original URL.
Adaptations for Survival L1: Plant Adaptations Learning Objectives: 1.Recall environmental factors that plants require to survive. 2.Describe plant adaptations.
Horticulture CD Unit B1 - 2 Floriculture. Problem Area 1 Greenhouse Crop Production.
Introduction to Energy Management. Week/Lesson 13 Control Strategies for Occupant Comfort.
Aim: What is Humidity and Dew Point? Do Now: What instruments do scientist use to measure air pressure? Explain why in the daytime a breeze comes from.
Heating Hot water heat system heating water in a boiler and pumping the hot water through pipes located in the greenhouse located under benches, low maintenance,
Nursery Management and Seedling Production
Introduction  Soil maps help to determine the basic nature and type of soil while soil testing determines soil quality and characteristics.  Environment.
Cycles Respiration, Photosynthesis, Evaporation and Condensation, The Weathering of Rock, and the Decay of Organic Matter.
Questions 1.Name the three major nutrients that all plants need 2.What part of the plant does each one of the three nutrients help specifically? 3.Why.
August 2008 Greenhouse Equipment R. Buchanan & Charles Hand June, 2002 Facilities shown are UGA & JCCHS Greenhouses Georgia Agriculture Education Curriculum.
Oklahoma Cooperative Extension Service Vegetable Production Approaches Jim Shrefler, Area Extension Horticulturist 2016 Town & Country Expo Gordon Cooper.
Do Now 1. List the four factors that affect the rate of transpiration in plants 2. Choose the correct ending to this statement: On a cloudy day when the.
Greenhouse Ventilation and Cooling
Greenhouse Production and Maintenance
Cooling and Ventilation Systems
Chapter 19 Greenhouses and Other Growing Structures
Greenhouse Structures, Covering Materials, and Climate Controls
Functions of a Greenhouse
Unit: The Physical Greenhouse
Disclaimer: Please note and abide by copyright laws. Some items contained in these presentations are taken from copyrighted material without express permission.
Greenhouse Structures
China Agrotime and your company name
The Air Around You-Part 6 Carbon Footprints and Climate Change
Plants need certain things to be able to grow.
Propagation Aids.
Cooling and Ventilation
When Do I Turn On the Fans...
All Living Things Need Water
Presentation transcript:

Greenhouse Functions and Controls Horticulture II

Greenhouse Basics Plants grow naturally outside, so why do we need a structure to grow them in? What is the purpose/function of a greenhouse? –The basic function is to provide a protective environment for crop(plant) production.

Greenhouse Environment What things make up the greenhouse environment? –Temperature –Moisture –Pest Control –Nutrition

Temperature Different plants have different temperature “preferences” for optimum growth. –Some plants prefer cool or even cold temps –Some plants prefer warm or hot temps The trick is to provide a temperature range that is conducive to plant growth. –Grow plants together that prefer the same temperature range.

Moisture Just as temperature matters, so does moisture. Some plants need dry environments, while others need very wet environments. How are moisture levels controlled? –Watering –Humidity Level of water vapor in the air.

Pest Control One of the biggest problems growers face is pest control. What types of pests? –Insects (aphids, whiteflies, etc) –Diseases (fungus, bacteria, viral) –Weeds(oxalis, henbit, etc) –Rodents (mice, rats)

Nutrition Plants, like animals, need nutrients to survive. Growers provide plants with the nutrients they need by supplementing either the water or soil with added nutrients. Growers also have to ensure adequate ventilation. –Carbon dioxide

Greenhouse Operating Expenses In addition to the cost of plants, pots, soil, fertilizer, etc, growers also have to deal with two other MAJOR expenses. –Labor –Heat Labor is usually the greatest expense. Heat is usually the second highest expense.

What is the greenhouse effect? Lets try a demonstration to find out. You will need: –Scissors –Plastic wrap or bag –Popsicle sticks –Glue –Tape

Building your “Greenhouse” Attach your Popsicle sticks together to build a small house or box. Cover the entire structure with plastic, leaving the bottom uncovered. Tape the plastic to the “greenhouse”

The Greenhouse Effect Place your completed greenhouse on the window sill. Note the temperature on the thermometer by the window. At the end of the period we will put the thermometer in your greenhouses to see what happens.

Environmental Control In order for a greenhouse to be effective, the greenhouse environment has to be closely controlled. What happens if the environment is not controlled? How do we ensure that the environment is kept constant?

Environmental Controls In a greenhouse we use environmental controls to manipulate and control the environment. –Thermostats Temperature –Humidistats Humidity –Photocells Light

The Greenhouse Effect Summarized The greenhouse effect is the way greenhouses collect and store heat from the sun. Radiant energy (the heat you feel when near something hot) warms the greenhouses (and whatever is inside of it).

Heat Loss Greenhouses, while efficient collectors of heat, are not good at storing it. Heat is lost through the greenhouse covering (called glazing) and additional heat may have to be provided. –Especially in winter.

Heat Control Heat, or more specifically temperature, has to be closely monitored and continually adjusted in a greenhouse. Temperature in a greenhouse is monitored by a thermostat, which controls sensors to open vents, operate exhaust fans or intake fans which pull air through a pad cooling system.

Thermostats Where should a thermostat be located? –Ideally they should be located at plant level for the best and most accurate control. Thermostat types –Aspirated –Thermistor

Aspirated Thermostats An aspirated thermostat utilizes a small fan which blows air continuously over the temperature sensing unit. This helps to maintain a more uniform temperature.

Thermistors A thermistor is a relatively new control that utilizes solid-state electronics. These devices allow the grower to use computers to monitor and control the greenhouse environment. Growers can set defined temperature ranges for certain time periods and the computers turn heat and cooling devices on and off as needed to maintain the desired temperatures.

Light Control Light levels have to be monitored in greenhouses to ensure that plants are receiving the correct amount. Photocells measure light intensities and may relay that information to computers that turns on additional lights or activates a shade cloth to reduce light. Timers may also be used to lights on or off at certain times.

Moisture Control Moisture in the air (humidity) should also be closely monitored for optimum growing conditions. A Humidistat measures the relative humidity in the air and controls fogging or misting systems to regulate the humidity. Humidity changes as heat dries the moisture from the air. Moisture must be added by both watering and fogging or misting for most plants.

Summary The greenhouse environment has to be closely monitored so that plants grow in the best possible conditions. A plant that grows in an environment where temperature, moisture, light, nutrition, and pest levels are ideal and continuous will be as strong and healthy as it can possibly be.